It's not a stupid question, but you do need to provide a little more info like the capacity of the batteries you wish to charge, the size of your panels etc.
As an example, a 120W panel will provide around 10 amps in direct sunlight at 12 volts - more than enough to charge most batteries in a day - in fact probably too much - you will need a regulator if you are to use it for charging purposes.
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