Oh, and you want to hook these up parallel. The output is around 20 volts, and the charge controller drops that down to 13.5 volts for charging. If you were to hook these up in series (if you even could), you would have 60 volts coming into a charge controller. Or after the charge controller, you'd have 40 volts. However I think you'd let the smoke out of the controllers and/or panels before that happened.
Series is good for taking two 6 volt golf cart batteries and getting 12 volts out of them for your RV. If you had two 12 volt Deep Cycle batteries, they would go in parallel.
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