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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.
Victron blue solar MPPT 75 / 15 charge controller.
Victron GX touch 50 control panel.
Victron MK3-USB Interface.
Victron Orio-TR Smart 12-30amp isolated charger DC-DC.
Victron Orion-TR smart 12-18amp isolated charge controller.
Victron Orion-TR smart 12-30A non isolated DC charger.