An off-grid system is not connected to the electricity grid and therefore requires battery storage.
As battery costs are reducing rapidly, so there is now a growing market for off-grid solar battery systems even in cities and towns. Following are the components of Off-grid solar system.

• The Battery Bank. In an off-grid system there is no public electricity grid. Once solar power is used by the appliances in your property, any excess power will be sent to your battery bank. Once the battery bank is full it will stop receiving power from the solar system. When your solar system is not working (night time or cloudy days), your appliances will draw power from the batteries.
• Backup Generator. For times of the year when the batteries are low on charge and the weather is very cloudy you will generally need a backup power source, such as a backup generator or gen-set.