solar panel: Power Backup Generators

Backup power sources are usually included in photovoltaic systems connected to the grid for when there is no sun. Engine generators, which can run on gas, propane or diesel-capable fuel, are the most common backup source because they provide power on demand. Generators are used more during the shorter days of winter and during periods of overcast weather. They can be configured for automatic start-up if a compatible inverter or charger is used, although many outside the network do not recommend them, generators should be checked for liquids and fuel before starting. Generators are also important for compensating load as it is difficult to get enough power and power from photovoltaic panels to perform this function. Generator options include fuel type, size (kW), and fuel storage. Noise, exhaust, and access to maintenance should be influential. Regular maintenance of oil check, filter change, and tune up, is necessary so the generator can be available when needed. A generator typically needs to be sized to handle both the battery charging and running the charges simultaneously. Inefficiencies due to high elevations and temperature, and the limitations of the load capacity available in the inverter / charger, will also influence the size.

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