Is there an online calculator?
I consume 30kwh per day. Winter minimum sun time is about 10 hrs.

Best answer:

Answer by campbelp2002
This source may help. If you want an off grid system where ALL your power ALWAYS comes from your own solar panels, then it will be EXTREMELY expensive. A better solution is to have a grid tied system, where you send extra power back to the grid during sunny days and take power from the grid at night. You can size the system to generate as much energy every year as you use. That is cheaper, but still out of most people’s ability to pay, unless you are rich. It was over $ 25,000 for my house, so I didn’t do it.

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