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Example of Photovoltaic Project. Is Solar Right for You?


  • 1. 8/28/2009 Harry Indig, PMPPrepared for Nicole and Ret Taylor156 Northeast 59 thStreet Seattle, WA 98105


  • As a class Project Photovoltaic at Shoreline Community College has agreed to review the analyze of cost, efficiency, feasibility, and return of investment using a roof mounted solar photovoltaic module array.

The customers home at 156 Ne 59 thSt in Seattle, WA has been owned by the current owners since 2005.They were fortunate this house has had no additions and minimally invasive remodels since its construction in 1909.Being its century year, the owners have sought to do an extensive remodel by lifting its 990 square feet main floor off its original foundation, raising it by 3 feet, upon setting it back down.This will double its conditioned square footage by allowing the current basement to become livable space. Conservation measures such as passive day lighting, increased insulation, improved circulation, the addition of a heating system, and replacement of the existing hot water system, and with the possibility of adding solar electric generation will all be incorporated into the remodel. 3. The customers objective is to look into the feasibility and long-term return on investment of a roof-mounted solar photovoltaic array. The owners believe the retail expense of power in the Seattle area is relatively inexpensive.However; both owners believe making decisions for the good of our community for the future, needs to be evaluated.The prospect of current energy prices increasing in the near future is also of concern.And with the incentives being offered by our government on federal and state levels coupled with the incentives being paid by the local power distribution companies for selling electricity to them; generating their own solar power becomes an attractive venture.Over all else, the owners would like to know if they are getting a good return on investment by putting their capital towards solar power versus investing in a security such as a secured bond or growth equity. 4. Is Solar Right for You?Yes, if you... Own the building where you want to install solar;Have a roof in good shape and shade-free; andAre interested in making a long-term investment to protect yourself from rising energy costs and want to reduce your environmental impact. 5.

  • Costs (for a solar electric system) between $8,000 and $10,000 per kilowatt (average residential systems are 1 to 3 kilowatts).
  • Is eligible for incentives offered by Washington State of $0.15 to $0.54 cents per kilowatt-hour (kWh) generated (by a solar electric system) with a cap of $5,000 per year (HB6170).
  • Is eligible for a federal tax credit equal to 30% of the system cost.

Benefits and Costs Solar Energy: Is a long-term investment that increases in value as energy costs rise.Reduces your "carbon footprint" -- the amount of greenhouse gases produced by your home or business, which in turn lessens your overall impact on the environment. 6. 7.

  • 27% less electricity will be consumed due to the combination of these upgrades at an initial cost of about $5,500.
  • A federal tax credit of $1,640 for the 2009 2010 tax years will be earned due to the combination of these upgrades.

To maximize the PV system investment (by purchasing as little electricity as possible) additional conservation steps will be taken to reduce electrical consumption.Electrical conservation will be achieved primarily through the migration of thermal loads from electrical to natural gas devices. 8.

  • Increase insulation in attic space
  • Replace electric space heaters
  • Replace electric hot water heater with high volume tankless natural gas unit


  • Sun Chart: Determination of Solar Exposure
  • Orientation. Azimuth Angles. Altitude Angles. Completing the Sun Chart
  • Reading the Sun Chart -Client Assistance Memo (CAM) 417 and 420
    • Solar Availability
    • What we do know about the Seattle solar window can be explained and analyzed with some basic tools of our solar industry.
    • One is the SunEye by Solmetric. The second device used was Solar Pathfinder by Solar Pathfinder.
    • Pathfinder provided mathematical precision for accurate shading assessment, solar system sizing, collector placement, and component specification.

10. Houses East View Houses West View 11. North Roof South Roof East Roof96.1%West Roof89.8% 12. 13.

  • WorkBook on Solar Technical Details lll.xls
    • Solar Inverter Options
    • Solar Modules
    • Financial Calculator = $


  • Typical utility interconnected solar electric system
  • (with optional backup battery storage)
  • In the City of Seattle, the department of Planning Development (DPD), there are two client assistance memo (CAMs) for solar systems covering both Photovoltaic and Thermal designs.
  • CAM 417 Sun Chart: determination of Solar Exposure
  • CAM 420 Solar Electric Systems
    • Permit Requirements
      • Electrical Permit
      • Building Permit
    • Land Use Requirements
      • Nonconforming Residential Uses
      • Lot Coverage Requirements
      • Height Requirements
    • Interconnection and Net Metering Requirements
      • Net Metering Benefits
      • Net Metering Required Forms
    • Installation Considerations
      • Solar Access, Sizing and Performance
      • Mounting Solar Modules
      • Structural Considerations
      • Electrical Considerations

15. (8) Silicon Energy 185 Watt Modules w/ racking$8,880 (1) Outback SmartRE 2500 Inverter$4,440 2 strings of 4 modules, 121.2 volts, 15.8 amps SmartRE 2500 Battery Enclosure (4) Group 27 106 Ah batteries Balance of System Components$1480 (1) Combiner box (1) Ground Fault Circuit Interruptor (1) 600 Volt DC Fused Disconnect (1) AC Fused Disconnect (1) 240 Volt Production Meter Miscellaneous conduit and fittings Labor $1480 Grand Total $16,280 ($11 / watt installed) 16. Notes: 1) Meter sockets must be located near each other and outside or otherwise consistent with location allowed bySeattle City Light Requirements for Electric Service. 2) Standard utility socket with face cover (no round sockets). Socket wired per sheet 2. 3) When production meter is removed, bottom terminals will be energized and line terminals will be de-energized (opposite of billing meter). 4) Billing meter will run backwards and subtract when energy flows to utility, production meter only runs forward. 5) Delivered energy flows from utility. 6) Received energy flows to utility. 17. 18. 19. Production Meter Wiring and New components for Net Metering per Seattle City Light 20. OutBack Power Products Smartre 2500 Up to 93% Inverter Efficiency 21. We have seen photovoltaic cells and arrays, also known as solar modules, convert sunlight into electrical energy. Now being used in a number of building applications, including shingles and fenestration, photovoltaic's are becoming a common onsite renewable energy source. Whether roof-mounted or built into the design, solar cells are connected in series to achieve proper voltages. The energy produced can either be stored in batteries or tied directly to the municipal grid. In some cases, you may qualify for tax credits or rebates when purchasing and installing photovoltaic modules. You also may be able to sell the extra energy you produce back to your local utility.The owners electric power consumption of4845kWh per year based on the past 2 years. This is13.27kWh/day. Several key parameters have been evaluated at this home site, which has excellent solar access. Based on the shade analysis performed we calculated96.1 % solar available sunlight. There is228square feet on the east roof for solar array layout. Application of Solar Photovoltaic 22. In 1980 the Solar Rating and Certification Corporation (SRCC) was incorporated as a non-profit organization with the primary purpose being the development and implementation of certification programs and national rating standards for solar energy equipment. A simple installation of several PV solar arrays on this project could use the equivalent sun hours per day based on SRCC certification data as table 1 from the Average Daily Total Solar Radiation for City of Seattle with two tilt angles. The infrastructure of the entire system on your roof needs to meet the CAM requirements of the City of Seattle. Table 1 Average Daily Total Solar Radiation for U.S. Cities City MJ/mday 23 Tilt MJ/mday 45 Tilt Btu/ftday 23 Tilt Btu/ftday 45 Tilt Seattle 11.65 11.63 1026 1024 23.

    • Energy Payback Times for Photovoltaic Technologies

Energy payback time (EPBT) is the length of deployment required for a photovoltaic system to generate an amount of energy equal to the total energy that went into it


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