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This solar power calculator will, given the Watt rating of a panel, your location and your grid cost of electricity produce a table indicating the solar powered energy you can expect to generate in Winter and Summer, along with the yearly average and equivalent cost of supplying the same electricity from the grid (or if your government operates a 'gross' feed-in tariff, put that in amount to see how much you get paid). You can use this information to calculate the rate of return and number of solar panels you need for a given load.