What happens to my solar PV system supply when there is no sunshine?

On an overcast but light day your panels can produce energy up to around 25% of their full capacity. A period of no sunlight, however, will mean that you will need to use grid power to supplement your solar power. The length of time a solar system can work without sunlight depends very much on the nature of the system. If you are not connected to the grid you will need to supplement your solar power system in times of no sunlight by electricity from batteries (this could be excess you have not used but have chosen to store rather than sell), wind turbines or other energy producing sources.

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