Stand Alone System.

In an Off Grid (or Stand Alone) Solar Power System, the house has no connection or disconnected from the utility grid and often relies on a bank of batteries to store power for use at night and during periods of limited sun.Although the up-front cost of these systems can be higher, Stand Alone Solar Power Systems are a very cost effective solution for rural households or businesses faced with a large connection cost to the main electricity grid. They also allow a consumer or business to remove themselves from the future risk of rising electricity prices.

An inactive connection to the grid or a generator is usually provided as an additional back up for these systems. Generator becomes the only backup if the house has no connection to grid.

In a stand alone power system, the

  • Solar Modules Capture the sun’s energy and convert it to electricity using photovoltaic (PV) cells. This DC electricity is used to charge batteries.
  • Charge Controller or regulator prevents overcharge which results in out-gassing of the batteries as well as keeping electrical storage in the batteries from discharging to the solar modules at night.
  • Batteries store the solar power generated and discharge the power as needed. The battery bank consists of one or more solar deep cycle type batteries. The capacity and type of battery needed is specific to the type of application.
  • Inverter changes the DC solar power into usable 240 volt AC electricity which is the most common type used by most household appliances and lighting.
  • In most cases, the house has a connection to the grid (if available) for backup power supply.
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