Back-up Power Supply

Generators or wind chargers can be used to supplement PV systems, this kind of system is known as a "hybrid system". Generators/wind chargers can be used in the winter months to keep the system charged when there is a lack of sunlight or in the summer months when there is an unexpected prolonged period of little sunlight. 

Generators can also be used directly when using large tools, which may be more economic than upgrading the PV system. It is more cost effective to employ a backup source of electricity during the winter months of the year. It is also recommended to charge the batteries by using a battery charger whilst you are running a generator for the use of your larger equipment. This will make sure your batteries are charged as well as ensure the maximum performance of your generator, as some engine-driven generators do not perform well when under-loaded.

Wind chargers should only be implemented if there is a sufficient amount of wind. It can be beneficial to a PV system in areas where it is very windy in winter, when  sunlight is at its least. Similarly to a generator, they can also be used to charge batteries or directly run certain loads (in water pumping).