DC-DC + Solar Battery Chargers (2 Way)

DC-DC chargers (also commonly know as Battery-To-Battery chargers) with built-in MPPT Solar controllers allow you to charge an auxiliary / leisure battery from your alternator whilst driving, and from your solar panel when parked-up.  These units offer the same benefits as a separate DC-DC Charger and an MPPT solar controller, but in a more compact footprint and requiring fewer cables.