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Roof-mounted solar panels are permanently fixed to the roof of your caravan. This can require drilling if using metal brackets, but there are options to use plastic mounts and a bonding agent. They are wired to your leisure battery via a charge controller.
NDS PSM 120WP 360 Solenergy 12V Solar Panel complete with gland to protect wires or any drilled holes in the roof from rainy weather conditions and a 6m long cable