It depends on how quickly you want to charge the battery bank, how quickly you want to deplete the bank (discharge on your useful load).
You could use a 1 watt panel and charge a HUGE battery bank over a period of months. You could use 10kW of solar panels to charge a small battery bank in a few minutes...
So the answer to your question is a question: how much power do you NEED?
It depends on how quickly you want to charge the battery bank, how quickly you want to deplete the bank (discharge on your useful load).
You could use a 1 watt panel and charge a HUGE battery bank over a period of months.
You could use 10kW of solar panels to charge a small battery bank in a few minutes...
So the answer to your question is a question: how much power do you NEED?
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