Grid-tied systems can be upgraded to include a battery backup: a bank of deep-cycle batteries. The backup battery is charged by both the grid and the solar panels. In the event of an outage, the backup battery will need to be switched on either manually or with an automatic system to provide backup power to the building.
Solar electricity back-up systems are used when electricity from the grid is available but unreliable. The solar electric back-up system can be used to provide electric power during periods when there is no electricity from the grid (blackouts). A small solar electric back up system can provide electric power to cover the most important needs such as lighting, computer and telecommunication (phone, radio, fax, etc) equipment. A larger system can be sized to power the fridge during a black out. The more power the appliances take and the longer the black outs normally last, the larger the solar electric system needs to be.
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