The stand alone PV power system is independent from the utility grid, especially, in the remote area where the utility is hard to access, and in the urban area, the stand alone system will be used to avoid the possibility of losing power when the grid goes down. Electricity from stand-alone systems can be stored in batteries and used at night or on sunless days. A generator may also be used for back-up.

 

System includes:

PV Array: as same as in grid-tied system

Recharge controller: controls battery bank recharge and discharge.

Inverter: inverts the DC power from the PV modules into AC power.

Battery bank: multiple batteries connected together in series and/or in parallel to create essentially one large battery of the required voltage and amp-hour capacity. In some ways the battery configuration and capacity are the most important electrical power decision to make, and a wise choice can help guarantee a steady supply of electrical power as well as a system that is simple to operate and maintain.

Loads: various electrical appliances.