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I actually purchased both a 20 and 30 watt model, as I also need a folding solar kit for Hampture, which should have less demanding requirements. In this case the panels will directly charge a lead acid battery pack that will act as a buffer as well as keep the setup running overnight. As soon as I get the battery pack in the mail, I'll be looking into building a weatherproof enclosure for the whole mess, and mounting the robot's charging dock to the side of it.