2.535kW PV Solar Array

Proposal

7 March, 2013

Vincent Stamato & Michael Todd

PV Solar Array Installation

Proposal For:

Lee Bondurant

16739 Wallingford Ave. N

Shoreline WA, 98133

March 7, 2013

Prepared By:

Vincent Stamato & Michael Todd

Work to be performed at above address.

Total cost of project

$10,000.00

This Includes:

2.45KW Grid Tied Photo Voltaic Solar Array, rack-mounted on the south facing roof above garage. Disconnect’s, Inverter, and Production Meter installed on the outside of the residence. 30 amp AC circuit from the solar array added to feed existing Circuit Breaker Panel. Rack and balance of system components supplied by contractor. All work to be performed in a safe and timely manner per local codes. All devices to be accessible labeled and installed per local code requirements. The PV system warranties are included in the document.

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Table of Contents:

The Site………………………………………………………………………………..3

Site Survey……………………………………………………………….……….…4

In My Back Yard Report………….…………………….…….……………....5

Pathfinder Analysis……………………………………………………………...6

Energy Cost Analysis…………………………………………………………….7

Rebates/Incentives/Credits………………………………………………….8

Wiring…………………………………………….…………………………….……..9

System and Hardware………………………………………………………….10

Warranty Information……………………………….…………………………11

Conservation Recommendations…………………………….……….….12

Information for Installers……………………….……………………….....13

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THE SITE:

This site is an excellent location for a PV array - a single family home in Shoreline Washington. It is a one story residence, with two south facing roofs. The circuit breaker panel is inside the home in an easily accessible mechanical room right between the array and the meter. The home is surrounded by trees, but surprisingly, they do not cast a shadow on the roof. The utility meter is located on the south wall of the house, which is the required location for the production meter and disconnects. The only requirement for this system is the cost. The homeowner does not want to spend more than $10,000 before rebates. This limits the size and capacity of the array. It also means that we cannot install Silicon Energy brand modules and take advantage of the made in Washington tax credit. We did, however, manage to design a 2,450W system for less than $10,000. We designed the system using ET Solar Industry modules and a Solar Edge inverter. The current cost of electricity in the residence is approximately $874.00 per year. The estimated annual return on the array, including money saved on electricity production and tax credits is over $500 dollars. This does not count the 30% federal tax credit. This system has the potential to pay for itself within 10 years. Also, recent research has indicated that adding solar to your home will increase the value of the property by nearly as much as the cost of the system itself.

http://green.blogs.nytimes.com/2011/04/21/study-finds-solar-panels-increase-home-values/

This job requires a permit from the Washington State department of Labor and Industries

http://www.lni.wa.gov/TradesLicensing/Electrical/default.asp.

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SITE SURVEY:

IMBY Analysis:The National Renewable Energy Laboratory is an organization focused on finding a solution to today’s energy problems. On their website, they have a free program called In My Backyard. It allows us to look at our site from a satellite view and make a rough estimate of our system. This data is not totally accurate, but it is a nice way to get a ballpark figure for a number of different system sizes.

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This chart displays the monthly electricity cost: Blue is before a Photovoltaic System Red is with a Photovoltaic System

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PATHFINDER ANALYSIS:

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ENERGY COST/ANALYSIS/USAGE:

Yearly Average Formula:

Add average daily for each billing cycle and divide by total number of cycles (6). Then multiply by the number of days in the year (365).141.8/6cycles=23.47kWh/day*365days/yr. = 8565kWh/year.Estimated output of this system according the Solar Pathfinder is 2525.00kWh/year.

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REBATES/INCENTIVES/CREDITS:

We had planned to use the Made in Washington tax credit, but due to budget restrictions, we used modules made elsewhere.

1. Washington Maximum Production credit: up to $5000 per year through 6/30/2020. @ $0.15/kWh

2. Federal Tax credit 30% of installation cost.For more information, go to www.desireusa.org or www.energy.gov/taxbreaks.hum.

year system size total cost 30% Fed. Tax credit

$ 0.15/kWh production incentive

system generated savings

2013 2450KW $10,000.00

$3,000.00 $367.50 $206.05

2014 $367.50 $206.052015 $367.50 $206.052016 $367.50 $206.052017 $367.50 $206.052018 $367.50 $206.052019 $367.50 $206.052020 $367.50 $206.05

8 Year Total $2,940.00 $1,648.40

System cost after 8yrs. $2,411.60Current elec. bill, approximate $711.90/yrNew electric bill, approximate $505.86/yr

Due to the size of the system, we cannot guarantee that it will generate enough power to pay for itself before the incentives end in 2020. If the system was bigger, it would have no problem paying for itself, but the $10,000 spending limit puts a more powerful system out of reach.

A New York Time article on increased home value’s with a PV solar system.

http://green.blogs.nytimes.com/2011/04/21/study-finds-solar-panels-increase-home-values/

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WIRING DIAGRAM:

1. PV array contains two strings of 10 245W ET Solar modules in series2. PV array wiring to junction box is #12 AWG with factory-installed MC connectors. Panel

frames are grounded with #12 AWG solid copper wires.3. Combiner box provides transition from array wiring to conduit wiring. This box houses

eight 150VDC Breakers. For this application, we will only need to use one of them.4. The Inverter is enclosed in NEMA 3R housing.5. The inverter is a Solar Edge SE3300US-ER rated at 3.3kW AC and is rated at 14Amps at

240V.6. Inverter complies with the requirements for the following standards “inverters, converters

and controllers for use in independent power systems”: UL1741-2005, IEEE 1547-2003.7. The Solar Edge is equipped with ground fault detection and interruption circuit as required

by UL 1741 and the National Electrical Code.8. The inverter output AC disconnect is rated at 30A, 240VAC, NEMA 3R.9. Negative pole of PV array referenced to ground at the inverter.10. 200A service panel with 30A two pole breaker for point of connection.

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SYSTEM AND HARDWARE:

The Array we decided to go with is an all in one system from Wholesale Solar. We had hoped to use all Made in Washington solar modules to take advantage of the higher production credit, but we could not do this without going over the $10,000 budget. The all in one system comes with 10 modules and an inverter. Everything else, including racking, sold separately.

Module: ET Solar, ET-P660260, 245W

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Inverter: Solar Edge SE3000US-ER

Itron Solar Meter:https://www.itron.com/na/productsAndServices/pages/Solar%20Meter.aspx.

System Warranty:http://www.wholesalesolar.com/pdf.folder/SolarEdge/se-warranty.pdf

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Foot Mounting Hardware:

Sunmodo Ez Roof Mount Kit is definitely the way to go here. The roof pitch is 20 degrees and our optimum tilt angle for this system is roughly 47 degrees, so we will have to add and adjustable tilt leg to get the modules propped up at the desired angle.

RECOMMENDATIONS:

Replacing old appliances with newer, energy efficient models may give you up to 20% energy savings:

1. Refrigerator2. Washer/dryer3. Dish washer4. Microwave5. Oven6. On demand water heater7. In wall mount electric heaters

Replace all light bulbs with CFL or LED lights. 60 watt illumination from a 13 watt bulb.Install motion detectors on outside lights.Put all electronics on power strips that can be switched off to save electricity.

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INFORMATION FOR INSTALLER:Home Owner's name Lee Bondurant

Site Address 16739 Wallingford Ave. N Shoreline WA, 98133

Roof Slope in degrees 20Roof orientation South FacingEstimated Solar Access: May-Sept 78%Estimated Solar Access: Oct-March 82%Usable Roof Space 46'x9'Roof Condition ExcellentRoof Type CompositeSupporting Structures Rafters at 2ft on centerObstructions on Roof noneAccessibility to Proposed Array Location Very EasyPossible Ground Mount or Awning? NoneELECTRICALUtility Company Seattle City LightElectrical Meter 368851

Electric Rate (in kWh) $0,09/kWh

Annual Consumption (kWh) 8565kWh/yr.

Will the PV system point of interconnect be at the main service panel or a subpanel?

Main service panel

Is there breaker space for a two pole breaker at the bottom of the bus in the service panel/subpanel?

Yes

Service Upgrade Required? noService panel main breaker rating bus rating, feeder size and type (CU/AL)

200A

Modules and Inverter infoPV Module, type and Wattage ET Solar, ET-P660260, 245WPV inverter model, type Solar Edge SE3000US-ERProposed Inverter Location Southern Wall, next to the Utility meterProposed route from array to inverter Through attic to DC disconnect and inverter on side of

house, directly below array.

Distance from array to inverter approx. 16'Distance from inverter to service panel approx. 120'

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Existing Electric Panel with spare room for 30 amp PV circuit.

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Existing Meter and location of future PV Production Meter.

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