This is a system where solar panels have to produce enough electricity to cover 100% of the energy needs. Most homes have a higher electricity demand in the evening or at night. Hence, the Off-grid System could usually be incorporated with a battery or generator. Off-grid Systems are more complex and less flexible than a Grid-tied System. They are most common in remote locations without utility services. Off-grid Solar Electric Systems operate independently from the local utility grid to provide electricity to a home, building, boat, or RV (or remote agricultural pumps, gates, traffic signs, etc.).These systems typically require either a battery bank as a backup source of energy.