There are two main types of residential solar installations.
The first and most common system connects your solar panel installation with the main electricity grid. This Grid Connect system allows you to feed energy back into the grid through your meter, and be financially rewarded for it by your energy company.
The other is a 'Stand-Alone' solar power system for remote properties where the cost of connecting the solar panel installation to the main grid is prohibitive. The system charges a battery bank, which in turn is used to power a house. A generator is usually kept available to back up the battery system.