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We have 19 panels, I take a reading once per month. In the winter we can produce as little as 100kWh per month, but in the summer this can reach 450kWh per month. Very roughly we use 10kWh per day, so unless someone has a very significant number of panels you will need the grid for 3-6 months per year to supplement your PV.I know you have had a solar PV / battery storage / EV setup for a long time and I just want to check with you. Do you use any grid electricity at all at the day rate ?