But how does a solar panel? With 8 square meters can install panels for a power of approx. 1 kW. If you need space to avoid shadowing them or keep them well oriented toward the sun, we need a larger area (2-3 times). What do you mean a power of 1 kW? It means that if the sun was always there, at the peak, would 1 kWh per hour. But as the sun at night there 'and it is not ever expected to peak, 1 kW produces only 1200 kWh in 1500 to almost north and south. If consumption
3000 kWh per year (see the bills) I need 2 to 2.5 kW (16-20 sqm). If I use 9000, I need 6 to 7.5 kW of panels. It does not matter if my contract is 3 or 4.5 kW. The contract only says that the 3 kW ENEL gives me a maximum of 3 kWh per hour, but is not that I'm always at maximum consumption!
How much does a system of 1 kW? ca. 5000 €. How much does a kWh of electricity? Maybe 30 cents. So if I produce with 5000 € from 1200 to 1500 kWh per year, corresponding to 360-450 € / year ...
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