Bainbridge Island PV and BESS Final Report 2022-08-28
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COBI - PV Panel and Battery Storage
Assessment and preparation of specifications for
design build install of PV and BESS systems at six
sites
Final Assessment Report
8/28/2022
Prepared for:
City of Bainbridge Island
280 Madison Avenue North
Bainbridge Island, WA 98110
Bainbridge Island PV and Battery Storage
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Table of Contents
Executive Summary ........................................................................................................................ 3
Project Overview .............................................................................................................................................................. 3
Site Visits performed ....................................................................................................................................................... 3
Waterfront Park Community Center (Sr Center) ...................................................................... 4
Existing Conditions ........................................................................................................................................................... 4
Site Overview .................................................................................................................................................................... 4
Building Overview ............................................................................................................................................................. 4
Electrical Overview ........................................................................................................................................................... 4
Recommendations and Approach ................................................................................................................................ 4
System Sizing ..................................................................................................................................................................... 4
Electrical Point of Connection and Required Upgrades for POC .................................................................................... 5
Siting of new PV modules, inverters and BESS equipment............................................................................................. 5
Bainbridge Island Recreation Center ............................................................................................ 6
Existing Conditions ........................................................................................................................................................... 6
Site Overview .................................................................................................................................................................... 6
Building Overview ............................................................................................................................................................. 6
Electrical Overview ........................................................................................................................................................... 6
Recommendations and Approach ................................................................................................................................ 6
System Sizing ..................................................................................................................................................................... 6
Electrical Point of Connection and Required Upgrades for POC .................................................................................... 7
Siting of new PV modules, inverters and BESS equipment............................................................................................. 8
Bloedel Reserve ............................................................................................................................... 9
Existing Conditions ........................................................................................................................................................... 9
Site Overview .................................................................................................................................................................... 9
Building Overview ............................................................................................................................................................. 9
Electrical Overview ........................................................................................................................................................... 9
Recommendations and Approach .............................................................................................................................. 10
System Sizing ................................................................................................................................................................... 10
Electrical Point of Connection and Required Upgrades for POC .................................................................................. 10
Siting of new PV modules, inverters and BESS equipment........................................................................................... 11
Battle Point Park ........................................................................................................................... 13
Existing Conditions ......................................................................................................................................................... 13
Site Overview .................................................................................................................................................................. 13
Building Overview ........................................................................................................................................................... 13
Electrical Overview ......................................................................................................................................................... 13
Recommendations and Approach .............................................................................................................................. 13
Bainbridge Island High School ..................................................................................................... 13
Existing Conditions ......................................................................................................................................................... 14
Site Overview .................................................................................................................................................................. 14
Building Overview ........................................................................................................................................................... 14
Electrical Overview ......................................................................................................................................................... 14
Recommendations and Approach .............................................................................................................................. 14
Hyla Middle School ....................................................................................................................... 15
Existing Conditions ......................................................................................................................................................... 15
Site Overview .................................................................................................................................................................. 15
Building Overview ........................................................................................................................................................... 15
Electrical Overview ......................................................................................................................................................... 15
Recommendations and Approach .............................................................................................................................. 15
System Sizing ................................................................................................................................................................... 15
Electrical Point of Connection and Required Upgrades for POC .................................................................................. 16
Siting of new PV modules, inverters and BESS equipment........................................................................................... 17
Exhibit A – Site Data and Priority ............................................................................................... 18
Exhibit B – Cost Estimates ........................................................................................................... 19
Bainbridge Island PV and Battery Storage
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Executive Summary
Project Overview
The purpose of this report is to describe and evaluate six (6) potential sites for the City of Bainbridge Island
which have been identified for solar/photovoltaic (PV) systems and battery energy storage systems (BESS).
Each of these sites serve as community disaster hubs in the City of Bainbridge Island, WA and are as
follows:
1. Waterfront Park Community Center (Sr Center)
2. Bloedel Reserve
3. Bainbridge Island Recreation Center
4. Battle Point Park
5. Bainbridge Island High School
6. Hyla Middle School
The proposed work is being done to increase the resilience of community disaster hubs and increase
renewable energy generation in the Bainbridge Island community.
The Design Team has been selected by the City to develop specifications to be used in a future request
for proposals to install solar panels and battery storage at up to six locations (noted above) along with
performing a site visit to each location, with assistance from City staff. This report will identify the general
existing conditions of each site, describe deficiencies of existing systems and make recommendations for
electrical upgrades required. The report will also assess each site and make a recommendation for priority
along with rough order of magnitude (ROM) opinion of construction costs.
The project includes the design of a new standby generator and air conditioning units, as well as electrical,
fiber and data upgrades at two different sites.
Site Visits performed
Faculty from Design West Engineering completed a site visit for each site over three days and as follows:
Staff collected equipment information on the existing systems based on visible name plate information
and visual inspections. We will describe throughout this report where we have made assumptions, so
that if additional information becomes available, the data can be re-incorporated to achieve the most
accurate results possible.
Waterfront Park Community Center (Sr Center)370 Brien Ave. SE 5/3/22
11:30-2:30
Bloedel Reserve 7571 NE Dolphin Dr 5/12
10:30-Noon
Bainbridge Island Recreation Center 11700 Meadowmeer Cir NE 5/12
1-2:30 pm
Battle Point Park 11299 Arrow Point Dr NE 5/12
3-5 pm
Bainbridge Island High School 9330 NE High School Rd 5/17
8:30 - 10 am
Hyla Middle School 7861 NE Bucklin Hill Rd 5/17
10:30 am
Date/Time of VisitLocationAddress
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Waterfront Park Community Center (Sr Center)
Existing Conditions
Site Overview
The site is located along the south side of the island in a Mixed use zone and comprises 7,840 s.f. or 0.18
acres. The site is zoned MUTC-CORE and is listed for use as a Community Center. The site is generally
flat in contour. Based on our cursory review of the site conditions, there do not appear to be any issues
such as excessive shading that might impact the proposed project.
Building Overview
The existing building consists of two major portions. The west building wing went through a major
renovation in 2012/2013. The east wing is currently slated for a remodel with some new interior
partitions along with new mechanical, electrical and lighting systems.
The building is comprised of wood frame type V-B construction and single story consisting of
approximately 6,545 square feet.
The exterior of the building appears to be in fairly good condition. The existing west roof is a composite
shingle roof that was replaced in 2013 with the remodel and appears to be in good condition. The
existing east roof appears to be much older and in fair condition. According to the original building
plans, the roof was designed for a live load of 25PSF.
Electrical Overview
The existing building electrical system is served by Puget Sound Energy (PSE) through a 50kVA pole
mounted transformer. The existing service is rated 400 Amps 120/240V 1 phase 3 wire. The service
consists of a CT section located in an exterior shed with 4 service disconnects feeding panels A, B, C and
D. Panels A and C are connected to an existing backup generator through integral switches built into the
panelboards. There is an existing 5kW PV system installed in 2014 that is connected to Panel D also
located in the shed. The existing PV production meter is adjacent to the PSE net meter on the outside of
the electrical shed. The existing propane backup generator is located east of the existing electrical
service in a fenced area.
Recommendations and Approach
System Sizing
The PV system size for this site would be limited by the available south and west facing usable roof area.
Based on the available roof area, it is estimated that (12) modules could be placed on the remaining
southwest roof. Assuming 440 watt panels, this would equate to a 5.28kWDC system size with an
estimated annual production of 5,687kWh. With an annual consumption of 47,200kWh, this would fall
well below the 90% recommended threshold for solar production.
Due to the existing on site generator and because of the complexity of the current switching
arrangement, it is not recommended for this site to receive a battery type energy storage system. The
generator provides backup power required during an outage to select loads. Based on initial
assessment, a major rework of the electrical service equipment would be required to incorporate a
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BESS.
Electrical Point of Connection and Required Upgrades for POC
The current PV system is connected directly to Panel D through a lockable AC disconnect. A 25 Amp
breaker was installed in a small load center labeled Panel D inside the shed to allow for the connection
of the PV inverter and the existing Panel D located in the building. In order to add PV, the existing load
center would need to be replaced with a 225 Amp 12 position load center to allow for an additional
inverters breaker and battery energy storage system (BESS) breaker. The existing 30 Amp AC disconnect
on the outside of the building would need to be replaced with a 60Amp disconnect.
To incorporate a battery system, a new automatic transfer switch would need to be installed between
the incoming utility service and distribution. Each of the existing service disconnects would need to be
consolidated into a single distribution panel which would also be connected to the PV system to allow
for an islanded microgrid. A central ESS controller would monitor the grid voltage and current and
control the BESS from charging to discharging. Further analysis is required to determine where this
additional equipment could be added to the existing system.
Siting of new PV modules, inverters and BESS equipment
It is recommended that the new PV modules be installed east of the existing array on the west wing
south facing roof. The inverter would be mounted adjacent to the existing inverter with conduits
following the same path.
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Bainbridge Island Recreation Center
Existing Conditions
Site Overview
The Recreation Center site (formally Bainbridge Athletic Club) is located in the middle of the island and
consists of two buildings, an approximately 39,000 sq. ft. Recreation Building and a 14,000 sq. ft. prefab
metal Court Building. The site is generally flat in contour.
Building Overview
The Rec Center building is a wood framed type V-B construction two story building consisting of
approximately 39,000 square feet. The building has had various remodels and additions and was
recently acquired by the City. The building has a large west facing sloped roof, however, nearby trees
present potential shading issues for solar panels.
The court building is a prefabricated web steel building constructed in 2010. The large south facing roof
is a standing seam metal roof in good condition. The south facing roof has full exposure and is a good
candidate for solar panels. According to the original building plans, the roof was designed for a snow
load of 25PSF and a live load of 20PSF.
Electrical Overview
The existing building electrical system is served by PSE through a 225kVA pad mounted transformer.
The existing service is rated 1000 Amps 277/480V 3 phase 4 wire. The main service is located in a
central electrical room inside the rec center building. 480V power is distributed to large loads such as
the elevator and HVAC units. Transformers are provided for 120/208V power to appliances and
receptacles. There is no existing backup generator.
Recommendations and Approach
System Sizing
The Main Rec Center Building west facing roof is adjacent to large trees. Due to potential shading
issues, it is not recommended to place new PV modules on the main Rec Center Building.
The newer court building has a very large south facing sloped roof that is suitable for solar panels. The
system would consist of approximately (100) 440 watt modules with (4) 10kW string inverters. The
estimated annual production is 47,350kWh, which would offset around 11% of the estimate average
annual building energy use of 438,000 kWhr.
A BESS system would need to be sized at approximately 3,600kWhr to power the average daily energy
use for 3 days. With an estimated cost of $1.8M, it may not be feasible to provide a BESS for the entire
site electrical use. However, a small battery system sized for the Court building could be provided to
provide backup power should the court building be used as a disaster hub. The building is provided with
gas heating and electric ventilation. A smaller battery system would be sized for powering lighting,
heating fans and ventilation. Actual metering and/or energy auditing would be required for the court
building to determine the best battery size, however, based on existing available information, it is
estimated that a 150-200kWhr BESS would be needed.
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Electrical Point of Connection and Required Upgrades for POC
Since a large array is proposed at the Court Building, the inverters would need to be connected to the
existing 1000 Amp electrical service located at the Rec Building, rather than the small subpanel located
in the Court Building. Four new PV arrays would be provided, each connected to a 480V 10kW inverter.
The inverter output circuits would be combined in a 100 Amp 480V 3ph ‘DPV’ panel located inside the
building, adjacent to the inverters. The DPV panel would connect to the existing electrical service
through new above ground and underground 100 Amp 480V feeders. A new 100 Amp 480V AC
disconnect would be installed in the main electrical room along with a new 100 Amp fuse inside the
existing service switchboard for the new PV system.
If a BESS system is incorporated at the court building, a new electrical distribution would need to be
created to create an islanded microgrid that could be used during extended outages. A manual transfer
switch would be required to switch from utility to off in order to use the batteries and PV without
backfeed into the grid. The BESS system would be grid forming and allow for the batteries to be charged
by the PV system during an outage.
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Siting of new PV modules, inverters and BESS equipment
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Bloedel Reserve
Existing Conditions
Site Overview
The site is located at the north west side of the island in a R-0.4, OSR 0.4 residential use zone and
encompasses approximately 150 acres. The site changes in geography throughout several locations.
There are three locations on the site that were considered for PV and BESS systems:
1. Gate House
2. Floral Workshop
3. Maintenance Compound
Building Overview
Gate House
The existing Gate House building is an approximately 400 square feet single story building with a
basement. The building is of wood construction with steep gable roof and very little room for mounting
of solar panels. The adjacent parking lot was noted as a potential location for carport mounted panels.
Floral Workshop
The Floral Workshop building is comprised of wood frame type V-B construction consisting of
approximately 642 square feet. The single-story building was constructed in 2018. The exterior of the
building appears to be in good condition. The building has an exposed composite shingle southwest
facing roof making it a good candidate for solar PV panels. According to the original building plans, the
roof was designed for a dead load of 15PSF and a live load of 25PSF.
Maintenance Compound
The Maintenance Compound consists of two large buildings and additional sheds and accessory
buildings. The main multipurpose sheep shed building is comprised of wood frame construction and is
single story consisting of approximately 2,800 square feet. The building is estimated to be constructed
in the early 1980’s. The exterior of the building is in fair condition. The large south facing roof is a
composite shingle roof in fair condition. The south facing roof had full exposure and is a good candidate
for solar PV panels.
Electrical Overview
All three of the buildings are served by Puget Sound Energy (PSE) with 120/240V single phase services.
The gate house main service panel is 200 Amps and is located in the basement with the meter at the
main gate entrance wall. The floral shop main service panel is 200 Amps and is inside the building with
the meter across the street near the transformer and pump station service. The maintenance shed
meter is on the exterior of the building just outside the work room where the main service panel is
located. The service is rated 400 Amps and is split between (2) 200 Amp panels. It was noted that the
existing service CT section and service panelboards are mounted behind a workbench that impedes
code required clear working space in front of the panels. The work bench should be removed from the
front of the panelboards. There is a small backup generator at the gate house but no permanent
generators at the floral shop or maintenance compound.
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Recommendations and Approach
System Sizing
The estimated system size for the Gate House annual use is 30.8kWDC comprised of (70) 440 watt
modules and a three 10kW string inverters. The estimated annual production is 33,145kWh which
would be 89% of average annual use of 37,196 kWhr. Because the Gate House building does not have
much useable roof area, a new PV system would need a structure to be built to support the modules.
This could be done through a carport structure, however, building the structure would add
approximately $5.00 to $7.00 per watt to the installed cost, in addition to the additional underground
conduit and feeders.
The Floral Workshop has a southwest facing sloped roof which is ideal for PV modules. However, the
current power consumption is low considering the building is not occupied full time. A small PV system
could be added at this location to achieve a net zero energy footprint. Nearby trees present shading
issues and would have to be cut back. The estimated system size for the floral workshop based on
available roof size and annual use is 2.64kWDC comprised of (6) 440 watt modules and a 3kW string
inverter. The estimated annual production is 2,841kWh which would be 93% of average annual use of
3,050 kWhr.
The Floral Workshop has a very low energy footprint due to limited use. The building is used on an
intermittent basis. Based on current use, occupancy and limited space, a BESS is not recommended for
this building.
The Maintenance Shed building also has a south facing roof and is much larger that the floral workshop.
The energy consumption is also larger. The roof appears to be in good condition. The maintenance
shed system size to produce close to 90% of average use is 12.32kWDC. The existing roof can support
more than that amount however, it is not recommended based on energy use history. The system
would consist of (28) 440 watt modules with (2) 6kW string inverters. The estimated annual production
is 13,258kWh which would be 91% of average annual use of 14,615 kWhr.
The Maintenance Shed could be used as a storage site. Based on low energy use, this building is a good
candidate for a small BESS system. The recommended system size is 120kWhr based on average daily
usage.
Electrical Point of Connection and Required Upgrades for POC
The Gate House carport array would connect to a new 200 Amp PV distribution panel through three
inverters mounted to the carport columns. The inverter output circuits would be combined in a 200
Amp 240V 1ph ‘DPV’ panel located at the carport structure. The DPV panel would connect to the
existing electrical service through new underground 200 Amp 240V feeders. A new 200 Amp 240V AC
disconnect would be installed in the basement electrical adjacent to the existing panelboard. A line side
connection would be required at this service.
The Floral Workshop small roof mount array would connect through a wall mount inverter and connect
directly to the existing 200 Amp panel, through a 30 Amp disconnect. A new 20 Amp 2 pole breaker
would be installed in the existing panel, which has sufficient space for the new breaker.
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For the Maintenance Shed, two new PV arrays would be provided, one connected to each of the 200
Amp panelboards through mount inverters. New 40 Amp 2 pole breakers would be installed in the
existing panels. Two 60 Amp 2 pole disconnects would be located outside of the building, adjacent to
the meters. Two 60kWhr battery arrays would also connect to the existing panelboards. A transfer
switch would be required so that the battery arrays and PV system could operate in island mode,
creating a small microgrid. A BESS site controller would be provided along with metering for a
complete BESS/PV microgrid system.
Siting of new PV modules, inverters and BESS equipment
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Battle Point Park
Existing Conditions
Site Overview
Battle Point Park is located on the middle west portion of the island. The park totals 90.3 acres, is a
former naval radio station, and is largely open space. The recently renovated Transmitter Building is
used for gymnastics classes and camps.
Building Overview
The Transmitter Building is a historic World War II building, whose purpose during WWII was to facilitate
the transmission of messages from the Pacific Fleet. The building upper level was recently remodeled,
however, the basement appears to be mostly in original condition. The building is of CMU block
construction and has a small flat roof with the building size just over 3,100 s.f. The nearby maintenance
shop building is of wood frame type V-B construction single story building consisting of approximately
5,000 sq. ft. The building has a slightly sloped east-west facing metal roof.
Electrical Overview
Both buildings are served by PSE and each building has a 600 Amp 120/240V 3ph 4w delta electrical
service with a stinger leg. The buildings are fed by underground transformer banks. The Transmitter
building electrical panels appear to have been recently upgraded while the shop buildings panels are
aged. There is no backup generator at the Transmitter Building. The Maintenance Shop uses portable
generators as needed.
Recommendations and Approach
Both buildings appear to be good candidates for a microgrid power system to support the facilities as
disaster hubs. However, it is not recommended to install solar or battery systems at either of these
buildings given the various concerns outlined below.
The Transmitter Building has very little room for solar panels to be mounted on the roof. The roof is
fairly low and accessible, placing potential modules accessible to vandalism and/or theft. Given this is a
public facility, any PV modules should be in access controlled areas for both security and safety. A
carport or shade structure could be provided, however, as previously mentioned this would add
additional cost for building a structure that could be used elsewhere for additional PV or battery
capacity. The building construction type would make it difficult for new conduit penetrations into the
building. The electrical service has a stinger leg, which is difficult to balance. This presents a challenge
when designing a 3 phase PV system. Finally, the PSE transformers are aged and may need to be
replaced in order to support a new PV system.
The Maintenance shop has similar drawbacks for incorporating a new PV system. Although there is a
west facing roof, the slope is minimal, which is not ideal for solar panels and increases the need for
maintenance. The roof is also near large trees along the west side of the building that present shading
issues. Similar to the Transmitter building, the electrical service has a stinger leg and aging PSE
transformers that may need to be replaced in order to support a new PV system.
Bainbridge Island High School
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Existing Conditions
Site Overview
The High School site is located in the middle east area of the island in a mixed-use zone. The campus
consists of several buildings with different construction types. Each building on campus has a separate
electrical service.
Building Overview
The BHS 100 building is a two story brick/masonry building consisting of approximately 36,500 square
feet. The building is new and was built in 2021. The building has a flat roof with a large mechanical
equipment well in the middle and skylights around the perimeter.
Electrical Overview
The building is served by PSE with two electrical services, a 1600 Amp 120/208V 3ph 4 wire service and
a 1200 Amp 277/480V 3ph 4 wire service. The 480V service is provided through a PSE 750kVA
padmount transformer and the 208V service is powered by a 500kVA padmount transformer. The 480V
service powers large equipment such has HVAC units and also supplies the backup power through an
ATS that is connected to a permanent backup generator. The 120/208V service powers general purpose
receptacles and light appliances throughout the building.
Recommendations and Approach
The main limitation for a system size at BHS Bldg 100 is the amount of usable roof space. The roof is full
of mechanical equipment and skylights, leaving little room for adding solar panels. In order to
incorporate solar PV panels on the roof, a special mounting system would be needed to elevate the
modules above the mechanical equipment. The modules could then shade the existing skylights which
would be counterproductive. It is not currently recommended to add solar PV or BESS at this site.
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Hyla Middle School
Existing Conditions
Site Overview
The Middle School site is located on the southern middle side of the island in a R-0.4, OSR 0.4 residential
use zone and encompasses approximately 5.5 acres. The buildings are located on a gentle slope. There
are two buildings on the site that were considered for PV and BESS systems:
1. Red Building (Admin)
2. Yellow Building. (Science Classrooms)
Building Overview
Red Building
The existing Red Building serves as the Admin and Library building for the campus. It is the older of the
two buildings but received an interior remodel in 2018. The building is wood frame type V-B
construction and single story consisting of approximately 2,200 square feet with a basement area. The
building is rectangular with a northwest and southeast facing composite shingle roof.
Yellow Building
The Yellow Building is a two story building of wood frame type V-B construction totaling approximately
4,116 square feet. The building was constructed in the mid 1990’s and recently renovated in 2019. This
building houses the majority of classrooms for the campus. The exterior of the building appears to be in
good condition with a composite shingle roof. The building has an exposed southwest facing roof
making it a good candidate for solar panels.
Electrical Overview
Both buildings are served by Puget Sound Energy (PSE) with 120/240V single phase electrical services
fed from a 37.5kVA pole mounted transformer. The meters are located on the exterior of the tower
building. The Red Building main service panel is 200 Amps and is located inside the building in the
middle office. The Yellow Building main service panel is 200 Amps located in the lower level northeast
room inside the building. There is no permanent backup generator at this site.
Recommendations and Approach
System Sizing
Due to the limited amount of roof space and age of building, it is not recommended to add PV to the
Red Building. The roof orientation is not ideal for solar PV panels and there are trees to the east and
south that present shading concerns. If a PV system is implemented at the Red Building, the existing
trees to the east and large tree to the south would need to be cut or removed to mitigate shading
issues. The system size for this building would be limited by the load side connection limitation of 20%
of the 200 Amp panel, or 40 Amps along with a minimal amount of available roof. A 8.8kWDC array
would be provided on the southeast roof and would be comprised of (20) 440 watt modules and a (1)
10kW string inverter. The estimated annual production is 8,712kWh which would be 35% of average
annual use of 24,600 kWhr. The estimated production is slightly lower than the Yellow Building due to a
southeast orientation.
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The Red building could potentially incorporate a BESS system. Consisting of mostly office space, the
building could be used as an administrative area during an emergency or extended power outage. The
recommended system size to support 3 days of average use is 190kWhr.
The Yellow Building southwest facing roof is a good candidate for solar PV panels. The system size for
this building would also be limited by the load side connection limitation of 20% of the 200 Amp panel,
or 40 Amps. A 8.8kWDC array would be provided on the southwest roof and would be comprised of
(20) 440 watt modules and a (1) 10kW string inverter. The estimated annual production is 9,4720kWh
which would be 41% of average annual use of 23,158 kWhr.
The Yellow building is also a good candidate for a BESS system. The lighting is energy efficient and the
building could be used for multiple purposes during an emergency or extended power outage. The
recommended system size to support 3 days of average use is 190kWhr.
Electrical Point of Connection and Required Upgrades for POC
If shading issues can be mitigated at the Red Building, a new roof mount array would be connected
through a wall mount inverter and connect directly to the existing 200 Amp panel, through a 60 Amp 2
pole disconnect. A new 40 Amp 2 pole breaker would be installed in the existing panelboard for the
inverter output circuit.
At the Yellow Building, a new roof mount array would connect through wall mount inverters and
connect directly to the existing 200 Amp panel, through a 60 Amp 2 pole disconnect. A new 40 Amp 2
pole breaker would be installed for the inverter output circuit.
Two 100kWhr battery arrays would also connect to the existing panelboard in the Yellow Building
basement. A transfer switch would be required so that the battery arrays and PV system could operate
in island mode, creating a small microgrid. A BESS site controller would be provided along with
metering for a complete BESS/PV microgrid system.
The existing panel does not have sufficient space for the new breakers. A new panel would need to be
provided with an oversized bus to allow for connection of both the PV inverter and BESS output breaker.
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Siting of new PV modules, inverters and BESS equipment
Site # Name Address Meter #
Avg Annual
Usage
(kWhr)
Avg Daily
Usage
(kWhr)
Proposed
System
Size
(kWDC)
Production
(kWhr)
Production
% Avg Use
Qty 440W
Modules PV ROM Cost Cost/Watt Priority Notes
BESS
Size for 3
days
(kWhr)
BESS ROM
Cost
1 Waterfront Park Community Center
(Sr Center)370 Brien Ave. SE X164093995 No Data No Data 5.28 5682 12 $ 41,184.00 $ 7.80 4
2 Bainbridge Island Recreation
Center
11700 Meadowmeer
Cir NE P155440189 438000 1200.0 44 47350 11% 100 $ 236,419.13 $ 5.37 5 150 $ 188,204.17
3A Bloedel Reserve - Gate House 7571 NE Dolphin Dr X155418038 37196 101.9 30.8 33145 89% 70 $ 518,728.81 $ 16.84 7
3B Bloedel Reserve - Maintenance X162686298 14615 40.0 12.32 13258 91% 28 $ 57,566.47 $ 4.67 1 120 $ 155,403.60
3C Bloedel Reserve - Floral X155417995 3050 8.4 2.64 2841 93% 6 $ 17,956.08 $ 6.80 3
4 Battle Point Park
11299 Arrow Point Dr
NE P155439784 400 1.1 0 0 0% 0 $ - No bills received for usage
5A BI high school - Meter #1 - 480V
9330 NE High School
Rd P162356796 240000 657.5 0 0 0% 0 $ -
Usage based on limited
data
5B BI high school - Meter #2 - 208V P152754991
Included
above
Included
above 0 0 0 $ -
Not clear which meter data
provided for
6A Hyla Middle School - Red Bldg
7861 NE Bucklin Hill
Rd X163615046 24600 67.4 8.8 8712.4 35% 20 $ 42,271.52 $ 4.80 6 190 $ 238,818.20
6B Hyla Middle School - Yellow Bldg X15730256 23158 63.4 8.8 9470 41% 20 $ 51,883.68 $ 5.90 2 190 $ 238,818.20
Totals 112.64 120458.4 256 966,009.69$ 821,244.17$
Exhibit A – Site Data and Priority
Bainbridge Island PV and Battery Storage
Page 18
Mechanical I Electrical I Plumbing I Commissioning I Fire Protection I Technology I Energy
Bainbridge Island PV and Battery Storage
Page 19
Mechanical I Electrical I Plumbing I Commissioning I Fire Protection I Technology I Energy
Exhibit B – Cost Estimates
Engineer's Opinion of Estimated Cost
Bainbridge Island PV and BESS
City of Bainbridge Island
8/10/2022
Senior Center
MATERIAL QTY UNIT COST/MATL LABOR/MAN IN PLACE
UNIT COST UNIT HOURS COST
ITEM #1 ELECTRICAL SERVICE AND INFRASTRUCTURE
225 AMP LOAD CENTER, 120/240V 1PH 3W, N1 1 EA 3,000.00$ 3,000.00$ 16.00 16.00 5,276.00$
60 AMP FUSED DISCO, HD, NEMA 3R, 240V 1PH 1 EA 450.00$ 450.00$ 4.00 4.00 991.40$
INVERTER FEED: 2#8 1#10GRD - 1"C 150 FT 5.59$ 838.13$ 0.08 12.30 2,452.73$
0 EA -$ -$ 0.00 - -$
0 EA -$ -$ 0.00 - -$
TOTAL COST THIS SECTION 8,720.13$
ITEM #2 PV SYSTEMS
SOLAR MODULE - 440 WATT Monocrystalline 12 EA 400.00$ 4,800.00$ 1.00 12.00 6,741.60$
INVERTER - 5kW 1 EA 1,500.00$ 1,500.00$ 4.00 4.00 2,138.00$
PW WIRING 1 LOT 1,200.00$ 1,200.00$ 8.00 8.00 2,310.40$
TOTAL COST THIS SECTION 11,190.00$
ITEM #3 BATTERY SYSTEMS
ESS SYSTEM 1 LOT -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
TOTAL COST THIS SECTION -$
SUB TOTALS >>>>>>>>>>>>>>>>> 11,788.13$ 56.30
SALES TAX 9.2% >>>>>>>>>>>>>>>>>1,084.51$
LABOR HOURLY RATE >>>>>>>>>>>>>>>>>125.00$
TOTALS >>>>>>>>>>>>>>>>>12,872.63$ 7,037.50$
TOTAL MATERIAL & LABOR 19,910.13$
GENERAL MARKUPS
DESIGN CONTINGENCY 10.00% - 1,991.01$
ESCALATION TO FALL 2022 4.50% - 985.55$
GENERAL CONDITIONS/REQUIREMENTS 35.00% - 8,010.34$
CONTRACTOR OVERHEAD AND PROFIT 20.00% - 6,179.41$
BONDS & INSURANCE 3.50% - 1,297.68$
TOTAL CONSTRUCTION COST 38,374.13$
DISCLAIMER:
This Cost Estimate has been prepared in accordance with generally accepted professional practices for the
intended project use. There is no guarantee this estimate will not vary from actual construction costs.
Design West Engineering shall be not be held accountable for reliance on this cost estimated for financial purposes.
Mechanical I Electrical I Plumbing I Commissioning I Fire Protection I Technology I Energy
Engineer's Opinion of Estimated Cost
Bainbridge Island PV and BESS
City of Bainbridge Island
8/10/2022
Bloedel Reserve - Gate House
MATERIAL QTY UNIT COST/MATL LABOR/MAN IN PLACE
UNIT COST UNIT HOURS COST
ITEM #1 ELECTRICAL SERVICE AND INFRASTRUCTURE
200 AMP LINE SIDE TAP 1 EA 15,000.00$ 15,000.00$ 20.00 20.00 18,880.00$
200 AMP FUSED DISCO, HD, NEMA 3R, 240V 1PH 1 EA 1,500.00$ 1,500.00$ 4.00 4.00 2,138.00$
DPV FEEDER 3#250 1#2GRD - 2"C 300 FT 79.74$ 23,922.00$ 0.42 125.40 41,797.82$
DPV FEEDER, TRENCH AND REPAIR 300 FT 40.00$ 12,000.00$ 0.40 120.00 28,104.00$
0 EA -$ -$ 0.00 - -$
TOTAL COST THIS SECTION 90,919.82$
ITEM #2 PV SYSTEMS
SOLAR MODULE - 440 WATT Monocrystalline 70 EA 400.00$ 28,000.00$ 1.00 70.00 39,326.00$
INVERTER - 10kW 3 EA 3,500.00$ 10,500.00$ 8.00 24.00 14,466.00$
PW WIRING 3 LOT 1,800.00$ 5,400.00$ 14.00 42.00 11,146.80$
CARPORT STRUCTURE 1 LOT 90,000.00$ 90,000.00$ 120.00 120.00 113,280.00$
TOTAL COST THIS SECTION 178,218.80$
ITEM #3 BATTERY SYSTEMS
ESS SYSTEM EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
TOTAL COST THIS SECTION -$
SUB TOTALS >>>>>>>>>>>>>>>>> 186,322.00$ 525.40
SALES TAX 9.2% >>>>>>>>>>>>>>>>>17,141.62$
LABOR HOURLY RATE >>>>>>>>>>>>>>>>>125.00$
TOTALS >>>>>>>>>>>>>>>>>203,463.62$ 65,675.00$
TOTAL MATERIAL & LABOR 269,138.62$
GENERAL MARKUPS
DESIGN CONTINGENCY 10.00% - 26,913.86$
ESCALATION TO FALL 2022 4.50% - 13,322.36$
GENERAL CONDITIONS/REQUIREMENTS 35.00% - 108,281.20$
CONTRACTOR OVERHEAD AND PROFIT 20.00% - 83,531.21$
BONDS & INSURANCE 3.50% - 17,541.55$
TOTAL CONSTRUCTION COST 518,728.81$
DISCLAIMER:
This Cost Estimate has been prepared in accordance with generally accepted professional practices for the
intended project use. There is no guarantee this estimate will not vary from actual construction costs.
Design West Engineering shall be not be held accountable for reliance on this cost estimated for financial purposes.
Mechanical I Electrical I Plumbing I Commissioning I Fire Protection I Technology I Energy
Engineer's Opinion of Estimated Cost
Bainbridge Island PV and BESS
City of Bainbridge Island
8/10/2022
Bloedel Reserve - Floral Workshop
MATERIAL QTY UNIT COST/MATL LABOR/MAN IN PLACE
UNIT COST UNIT HOURS COST
ITEM #1 ELECTRICAL SERVICE AND INFRASTRUCTURE
20 AMP 2P BREAKER 1 EA 100.00$ 100.00$ 1.00 1.00 234.20$
30 AMP FUSED DISCO, HD, NEMA 3R, 240V 1PH 1 EA 250.00$ 250.00$ 4.00 4.00 773.00$
INVERTER FEED: 2#8 1#10GRD - 1"C 50 FT 5.59$ 279.38$ 0.08 4.10 817.58$
0 EA -$ -$ 0.00 - -$
0 EA -$ -$ 0.00 - -$
TOTAL COST THIS SECTION 1,824.78$
ITEM #2 PV SYSTEMS
SOLAR MODULE - 440 WATT Monocrystalline 6 EA 400.00$ 2,400.00$ 1.00 6.00 3,370.80$
INVERTER - 3kW 1 EA 1,200.00$ 1,200.00$ 4.00 4.00 1,810.40$
PW WIRING 1 LOT 1,200.00$ 1,200.00$ 8.00 8.00 2,310.40$
TOTAL COST THIS SECTION 7,491.60$
ITEM #3 BATTERY SYSTEMS
ESS SYSTEM EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
TOTAL COST THIS SECTION -$
SUB TOTALS >>>>>>>>>>>>>>>>> 5,429.38$ 27.10
SALES TAX 9.2% >>>>>>>>>>>>>>>>>499.50$
LABOR HOURLY RATE >>>>>>>>>>>>>>>>>125.00$
TOTALS >>>>>>>>>>>>>>>>>5,928.88$ 3,387.50$
TOTAL MATERIAL & LABOR 9,316.38$
GENERAL MARKUPS
DESIGN CONTINGENCY 10.00% - 931.64$
ESCALATION TO FALL 2022 4.50% - 461.16$
GENERAL CONDITIONS/REQUIREMENTS 35.00% - 3,748.21$
CONTRACTOR OVERHEAD AND PROFIT 20.00% - 2,891.48$
BONDS & INSURANCE 3.50% - 607.21$
TOTAL CONSTRUCTION COST 17,956.08$
DISCLAIMER:
This Cost Estimate has been prepared in accordance with generally accepted professional practices for the
intended project use. There is no guarantee this estimate will not vary from actual construction costs.
Design West Engineering shall be not be held accountable for reliance on this cost estimated for financial purposes.
Mechanical I Electrical I Plumbing I Commissioning I Fire Protection I Technology I Energy
Engineer's Opinion of Estimated Cost
Bainbridge Island PV and BESS
City of Bainbridge Island
8/10/2022
Bloedel Reserve - Maintenance Shop
MATERIAL QTY UNIT COST/MATL LABOR/MAN IN PLACE
UNIT COST UNIT HOURS COST
ITEM #1 ELECTRICAL SERVICE AND INFRASTRUCTURE
40 AMP 2P BREAKER 2 EA 150.00$ 300.00$ 1.00 2.00 577.60$
60 AMP FUSED DISCO, HD, NEMA 3R, 240V 1PH 2 EA 450.00$ 900.00$ 4.00 8.00 1,982.80$
INVERTER FEED: 2#8 1#10GRD - 1"C 100 FT 5.59$ 558.75$ 0.08 8.20 1,635.16$
0 EA -$ -$ 0.00 - -$
0 EA -$ -$ 0.00 - -$
TOTAL COST THIS SECTION 4,195.56$
ITEM #2 PV SYSTEMS
SOLAR MODULE - 440 WATT Monocrystalline 28 EA 400.00$ 11,200.00$ 1.00 28.00 15,730.40$
INVERTER - 6kW 2 EA 1,800.00$ 3,600.00$ 6.00 12.00 5,431.20$
PW WIRING 2 LOT 1,200.00$ 2,400.00$ 8.00 16.00 4,620.80$
TOTAL COST THIS SECTION 25,782.40$
ITEM #3 BATTERY SYSTEMS
ESS SYSTEM 1 LOT 60,000.00$ 60,000.00$ 120.00 120.00 80,520.00$
EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
TOTAL COST THIS SECTION 80,520.00$
SUB TOTALS >>>>>>>>>>>>>>>>> 78,958.75$ 194.20
SALES TAX 9.2% >>>>>>>>>>>>>>>>>7,264.21$
LABOR HOURLY RATE >>>>>>>>>>>>>>>>>125.00$
TOTALS >>>>>>>>>>>>>>>>>86,222.96$ 24,275.00$
TOTAL MATERIAL & LABOR 110,497.96$
GENERAL MARKUPS
DESIGN CONTINGENCY 10.00% - 11,049.80$
ESCALATION TO FALL 2022 4.50% - 5,469.65$
GENERAL CONDITIONS/REQUIREMENTS 35.00% - 44,456.09$
CONTRACTOR OVERHEAD AND PROFIT 20.00% - 34,294.70$
BONDS & INSURANCE 3.50% - 7,201.89$
TOTAL CONSTRUCTION COST 212,970.07$
DISCLAIMER:
This Cost Estimate has been prepared in accordance with generally accepted professional practices for the
intended project use. There is no guarantee this estimate will not vary from actual construction costs.
Design West Engineering shall be not be held accountable for reliance on this cost estimated for financial purposes.
Mechanical I Electrical I Plumbing I Commissioning I Fire Protection I Technology I Energy
Engineer's Opinion of Estimated Cost
Bainbridge Island PV and BESS
City of Bainbridge Island
8/10/2022
Recreation Center - Court Building
MATERIAL QTY UNIT COST/MATL LABOR/MAN IN PLACE
UNIT COST UNIT HOURS COST
ITEM #1 ELECTRICAL SERVICE AND INFRASTRUCTURE
100 AMP LOAD CENTER, 277/480V 3PH 3W, N1 1 EA 7,500.00$ 7,500.00$ 20.00 20.00 10,690.00$
100 AMP FUSED DISCO, HD, NEMA 3R, 480V 3PH 1 EA 900.00$ 900.00$ 4.00 4.00 1,482.80$
INVERTER FEEDS 4#8 1#10GRD - 1"C 80 FT 6.24$ 499.20$ 0.09 7.04 1,425.13$
DPV FEEDER, TRENCH AND REPAIR 200 FT 40.00$ 8,000.00$ 0.40 80.00 18,736.00$
0 EA -$ -$ 0.00 - -$
TOTAL COST THIS SECTION 32,333.93$
ITEM #2 PV SYSTEMS
SOLAR MODULE - 440 WATT Monocrystalline 100 EA 400.00$ 40,000.00$ 1.00 100.00 56,180.00$
INVERTER - 10kW 4 EA 3,500.00$ 14,000.00$ 8.00 32.00 19,288.00$
PW WIRING 4 LOT 1,800.00$ 7,200.00$ 14.00 56.00 14,862.40$
TOTAL COST THIS SECTION 90,330.40$
ITEM #3 BATTERY SYSTEMS
ESS SYSTEM EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
TOTAL COST THIS SECTION -$
SUB TOTALS >>>>>>>>>>>>>>>>> 78,099.20$ 299.04
SALES TAX 9.2% >>>>>>>>>>>>>>>>>7,185.13$
LABOR HOURLY RATE >>>>>>>>>>>>>>>>>125.00$
TOTALS >>>>>>>>>>>>>>>>>85,284.33$ 37,380.00$
TOTAL MATERIAL & LABOR 122,664.33$
GENERAL MARKUPS
DESIGN CONTINGENCY 10.00% - 12,266.43$
ESCALATION TO FALL 2022 4.50% - 6,071.88$
GENERAL CONDITIONS/REQUIREMENTS 35.00% - 49,350.93$
CONTRACTOR OVERHEAD AND PROFIT 20.00% - 38,070.71$
BONDS & INSURANCE 3.50% - 7,994.85$
TOTAL CONSTRUCTION COST 236,419.13$
DISCLAIMER:
This Cost Estimate has been prepared in accordance with generally accepted professional practices for the
intended project use. There is no guarantee this estimate will not vary from actual construction costs.
Design West Engineering shall be not be held accountable for reliance on this cost estimated for financial purposes.
Mechanical I Electrical I Plumbing I Commissioning I Fire Protection I Technology I Energy
Engineer's Opinion of Estimated Cost
Bainbridge Island PV and BESS
City of Bainbridge Island
8/10/2022
Hyla Middle School - Yellow Building
MATERIAL QTY UNIT COST/MATL LABOR/MAN IN PLACE
UNIT COST UNIT HOURS COST
ITEM #1 ELECTRICAL SERVICE AND INFRASTRUCTURE
225 AMP LOAD CENTER, 120/240V 1PH 3W, N1 1 EA 3,000.00$ 3,000.00$ 16.00 16.00 5,276.00$
60 AMP FUSED DISCO, HD, NEMA 3R, 240V 1PH 1 EA 450.00$ 450.00$ 4.00 4.00 991.40$
INVERTER FEED: 2#8 1#10GRD - 1"C 150 FT 5.59$ 838.13$ 0.08 12.30 2,452.73$
0 EA -$ -$ 0.00 - -$
0 EA -$ -$ 0.00 - -$
TOTAL COST THIS SECTION 8,720.13$
ITEM #2 PV SYSTEMS
SOLAR MODULE - 440 WATT Monocrystalline 20 EA 400.00$ 8,000.00$ 1.00 20.00 11,236.00$
INVERTER - 10kW 1 EA 3,500.00$ 3,500.00$ 8.00 8.00 4,822.00$
PW WIRING 1 LOT 1,200.00$ 1,200.00$ 8.00 8.00 2,310.40$
TOTAL COST THIS SECTION 18,368.40$
ITEM #3 BATTERY SYSTEMS
ESS SYSTEM 1 LOT -$ 95,000.00$ 0.00 160.00 123,740.00$
EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
TOTAL COST THIS SECTION 123,740.00$
SUB TOTALS >>>>>>>>>>>>>>>>> 111,988.13$ 228.30
SALES TAX 9.2% >>>>>>>>>>>>>>>>>10,302.91$
LABOR HOURLY RATE >>>>>>>>>>>>>>>>>125.00$
TOTALS >>>>>>>>>>>>>>>>>122,291.03$ 28,537.50$
TOTAL MATERIAL & LABOR 150,828.53$
GENERAL MARKUPS
DESIGN CONTINGENCY 10.00% - 15,082.85$
ESCALATION TO FALL 2022 4.50% - 7,466.01$
GENERAL CONDITIONS/REQUIREMENTS 35.00% - 60,682.09$
CONTRACTOR OVERHEAD AND PROFIT 20.00% - 46,811.90$
BONDS & INSURANCE 3.50% - 9,830.50$
TOTAL CONSTRUCTION COST 290,701.88$
DISCLAIMER:
This Cost Estimate has been prepared in accordance with generally accepted professional practices for the
intended project use. There is no guarantee this estimate will not vary from actual construction costs.
Design West Engineering shall be not be held accountable for reliance on this cost estimated for financial purposes.
Mechanical I Electrical I Plumbing I Commissioning I Fire Protection I Technology I Energy
Engineer's Opinion of Estimated Cost
Bainbridge Island PV and BESS
City of Bainbridge Island
8/10/2022
Hyla Middle School - Red Building
MATERIAL QTY UNIT COST/MATL LABOR/MAN IN PLACE
UNIT COST UNIT HOURS COST
ITEM #1 ELECTRICAL SERVICE AND INFRASTRUCTURE
40 AMP 2P CIRCUIT BREAKER IN EXISTING PANEL 1 EA 150.00$ 150.00$ 1.00 1.00 288.80$
60 AMP FUSED DISCO, HD, NEMA 3R, 240V 1PH 1 EA 450.00$ 450.00$ 4.00 4.00 991.40$
INVERTER FEED: 2#8 1#10GRD - 1"C 150 FT 5.59$ 838.13$ 0.08 12.30 2,452.73$
0 EA -$ -$ 0.00 - -$
0 EA -$ -$ 0.00 - -$
TOTAL COST THIS SECTION 3,732.93$
ITEM #2 PV SYSTEMS
SOLAR MODULE - 440 WATT Monocrystalline 20 EA 400.00$ 8,000.00$ 1.00 20.00 11,236.00$
INVERTER - 10kW 1 EA 3,500.00$ 3,500.00$ 8.00 8.00 4,822.00$
PW WIRING 1 LOT 1,200.00$ 1,200.00$ 8.00 8.00 2,310.40$
TOTAL COST THIS SECTION 18,368.40$
ITEM #3 BATTERY SYSTEMS
ESS SYSTEM 1 LOT -$ 95,000.00$ 0.00 160.00 123,740.00$
EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
EA -$ -$ 0.00 - -$
TOTAL COST THIS SECTION 123,740.00$
SUB TOTALS >>>>>>>>>>>>>>>>> 109,138.13$ 213.30
SALES TAX 9.2% >>>>>>>>>>>>>>>>>10,040.71$
LABOR HOURLY RATE >>>>>>>>>>>>>>>>>125.00$
TOTALS >>>>>>>>>>>>>>>>>119,178.83$ 26,662.50$
TOTAL MATERIAL & LABOR 145,841.33$
GENERAL MARKUPS
DESIGN CONTINGENCY 10.00% - 14,584.13$
ESCALATION TO FALL 2022 4.50% - 7,219.15$
GENERAL CONDITIONS/REQUIREMENTS 35.00% - 58,675.61$
CONTRACTOR OVERHEAD AND PROFIT 20.00% - 45,264.05$
BONDS & INSURANCE 3.50% - 9,505.45$
TOTAL CONSTRUCTION COST 281,089.72$
DISCLAIMER:
This Cost Estimate has been prepared in accordance with generally accepted professional practices for the
intended project use. There is no guarantee this estimate will not vary from actual construction costs.
Design West Engineering shall be not be held accountable for reliance on this cost estimated for financial purposes.
Mechanical I Electrical I Plumbing I Commissioning I Fire Protection I Technology I Energy