Solar PV Energy
Photovoltaics, commonly known as PV, converts the solar energy in sunlight into electrical energy with a system producing no air pollution and using almost no moving parts. They are extremely reliable with a 25 year warrantee and a 40 year design life.
Solar modules, groupings of special silicon cells, produce a DC (direct current) electrical charge when the cells are struck by solar energy. The DC current is routed to a device called an inverter that changes it into the AC (alternating current) electricity required by most household and business applications.
The result is a clean and reliable energy alternative for either residential or commercial use. A PV system can be integrated into a new construction project or installed on an existing building. Typically, PV modules are mounted on rooftops but they can also be mounted on the ground, on a nearby roof such as a shed or detached garage, or even incorporated into a shade structure.
PV systems used to power buildings fall into four basic categories:
“Grid-Tied” or Grid-Interconnected PV
These systems are the most popular and use special inverters to allow electricity to flow safely back into the electric grid. When solar power is generated, surplus electricity can actually flow back into the grid after the power for the building is used. Depending on your utility company, you can be given up to full retail credit per kilowatt-hour. Since there are no batteries, these systems cannot store energy and are designed to shut down if the grid is down.
“Grid-Tied” or Grid-Interconnected with Battery Back-up
These systems offer customers continued power when the grid goes down, while still being connected to the grid, for seamless power. Newer systems also accept other power sources, in addition to PV, such as wind or even traditional gas-powered generators to provide power and/or charge the battery at night and/or if the grid is not available.
Useful when a completely independent or “stand alone” system is needed. Since no grid power is used, the system must be carefully designed based on power usage, peak demand and seasonal solar variations. Batteries are typically used to provide power at night, in low sun or high electric demand conditions. These systems are ideal for remote locations where no utilities exist.
Sometimes called “solar farms,” they provide power for regional users by, or in cooperation with, electric utility providers.
Regardless of PV system or metering, most homeowners should install a solar hot water system along with the PV system. Why both? Because a solar hot water system is significantly more cost-effective and requires a fraction of the roof space to create the equivalent amount of energy to heat water. This will also allow the PV system to satisfy a higher proportion of household electric demand, making the PV system even more cost-effective.
Take advantage of generous solar financial incentives – Two sources combine to help you pay for your home’s photovoltaic solar system. The federal government gives a one time tax credit equal to 30% of the total cost of the system. There are also rebates from utility providers that can be as high as $1,550 per installed kilowatt!
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