Frequently Asked Questions
What is a solar electric or photovoltaic system? Solar electric or photovoltaic (PV) systems use the sun’s energy to make electricity. PV technology produces direct current electricity by collecting electrons freed by the interaction between sunlight and the semiconductor materials in a PV cell.
Why should I consider buying a PV system?
A PV system reduces or eliminates the amount of electricity you purchase from your utility or electric service provider. A PV system will save you money on your electricity bill and act as a hedge against future price increases. The electricity generated by your PV system is clean, renewable and reliable. You help your community by reducing the electricity demand and provide additional electricity for the grid when you generate more than you use during the day, when this demand is highest.
Do I have a good site for PV?
Your site must have clear, unobstructed access to the sun. Buildings, trees or other vegetation should not shade your site. South-facing roof exposure is best, but roofs facing east and west may be OK. If a rooftop is not available, your PV system can also be mounted on the ground.
How much mounting space do I need?
A small PV system requires as little as 50 square feet; however, a larger system that meets the needs of a typical household, would use between 300 to 600 square feet. As a rule of thumb, 100 square feet of PV area produces one kilowatt of electricity.
What is Net Metering?
Net Metering allows you to “bank” any surplus electricity your system generates on the electric grid. For example, excess electricity might be generated during the day when your system produces more electricity than you use. During this time, your meter would simply run backwards to record the amount of electricity your system has banked onto the grid. Later, you can use an equal amount of electricity without incurring a cost. If more electricity from the grid is used than your system has banked, your utility will charge you annually for the difference. If your system produces more electricity than you need on an annual basis, your electric service provider may purchase it, but is not required to.
Are there any special features I should consider?
An inverter is needed to change the direct current (DC) power from the solar panels into alternating current (AC) electricity to power your electrical devices and to be compatible with the electric grid. Batteries can provide back-up power for your home or business in case of grid outages, but they also increase your costs.
How much does a PV system cost?
Although many factors affect the cost, an average PV system currently costs from $8 to $10 dollars a watt, including installation, or $16,000 to $20,000 for a 2 kW system before rebate.
* Some content on this page courtesy of California Energy Commission
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