Solar Electric PV

Solar Electric Systems utilize the sun’s energy and intensity to generate electricity using several “photovoltaic” cells (PVs) connected together into a panel. The technology and manufacturing methodology has been in use for over 25 years. The general manufacturing methods (for mono and polycrystalline Silicon) have improved with automation and controls to provide long life. However the general fabrication process is largely unchanged. Solar systems have been in service for over 30 years.

During installation, several panels are connected together into an “arrays”. The Array is typically installed on the roof with a racking system anchored by the roof itself (rafter penetration). The array may also be installed “off roof” in mounting or tracking system configuration. The Array is then connected by high quality, reliable wiring and conduits to an “inverter” that converts the electricity from direct current (DC) to alternating current (AC) for use in the home. The electricity is routed through the Utility’s distribution box to ensure delivery to the home. Specific safety, roofing, materials and electric codes must be followed and verified to ensure the highest quality installation: NEC, OSHA, Uniform Building Codes, UL and NABCEP.

When the sun strikes these PVs the energy is converted into electricity and delivered to you home or business from the roof top or other locations on the property. This solar electricity flows into the house through your utility company’s power distribution box (Grid Tied). When the electricity generated by the sun exceeds the demand in the home, the extra energy (electricity) is then sent back to the utility’s “grid” for use where needed (your neighbors) and your meter will spin backwards. The extra energy sent to the grid will be credited back to the homeowner and is known as “net metering”. With net metering the utility will apply an energy credit to your monthly bill for the energy not used; at the end of the year this credit is usually zeroed out providing no benefit to the homeowner/business if the solar system is over sized. Some utilities, states and countries apply the lowest rate to compensate you for negative balance. In California, recent legislation has led to a law that will require the utilities to pay the homeowner “fair market value” for the extra energy. This is known as ‘feed-in tariffs”. In California feed in tariffs will go into effect in 2010. Feed in tariffs with net metering enables the homeowner to become a true energy producer and provides additional financial incentive to go solar.