System Qualifications
Qualifications for a solar energy system to be one of our nations Million Solar Roofs

To be included in the Million Solar Roofs Initiative, a building's solar energy system must comply with all relevant parts of the National Electrical Code (NEC), Underwriters Laboratories (UL) standards, and the Solar Rating and Certification Corporation (SRCC) standards. The system must also be located on or immediately adjacent to the building and meet the following minimum standards.

Photovoltaic Systems:

Residential systems must be a minimum of 0.5 kW.

School and church systems must be a minimum of 1.0 kW.

Commercial systems must be a minimum of 2.0 kW.


Solar Thermal Water Heating Systems:
 

Residential domestic systems must be a minimum of 1.0 kW equivalent or 20 square feet of collector area.

Residential swimming pool heating systems must be a minimum of 100 square feet of collector area.

Commercial domestic systems must be a minimum of 2.0 kW or 40 square feet of collector area.

Commercial swimming pool heating systems must be a minimum of 400 square feet of collector area.


Solar Thermal Space Heating Systems:
 

Collector area must be a minimum of 100 square feet or 4.0 kW.


Cost of Solar Energy Systems
A residential solar hot water system may cost anywhere from $1,800 to $3,500 and compete effectively with water heated by electricity that costs 8 cents per kWh or more. Solar thermal space heating is very effective in most areas of the country. For example, the cost of a 100-square-foot transpired collector installation can range from $1,000 for retrofits on existing buildings and $500-$700 for new systems, but can produce energy savings to offset the entire cost of the system in five years or less.

Photovoltaic costs are more complicated because system size, features, and net cost to the users depend on the financing terms and interest rates, available incentives, and access to low-cost hardware and installation through bulk purchasing programs. For example, in a recent
study of Million Solar Roof photovoltaic system costs from 1997 to 2000 found that residential photovoltaic systems installed in Sacramento, California, cost about $5,100 per kilowatt (this cost does not include the incentives available which lower the cost to the homeowner significantly) and provide energy at approximately 18 cents per kilowatt-hour ?primarily due to a forward looking bulk purchase agreement with a manufacturer. This same study found the national average cost of a grid-tied photovoltaic system to be $7,400 per kilowatt and off-grid systems (which include battery back-up in order to have electricity when the sun isn° shining) cost about $14,000 per kilowatt.

 

 Did you install a system that qualifies? Let us know!

 

 

 

 

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