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There is no grounding to the frame of the solar panel. If it were, I would have experienced one hell of a short circuit with a positive ground. Just two wires coming out of the panel, which I connected to an inexpensive regulator ($39). The batteries are rigged in a series parallel connection, which makes it a 12-volt DC system. All four batteries get charged at the same rate at the same time. Never had a problem with this setup.
Gary
Gary
