@binner are you aware that the Australian Electrical Standard (AS3001) for caravan/camper/motor home etc with a fixed 15A input have changed? From what I just saw batteries cannot be placed in a habitable area though that just means a box or compartment sealed to the interior so batteries can still go under the bed or seats. Battery compartments must be vented to the outside regardless of construction and solar panels must have breakers between the panel and bms. If there are 4 or more panels then all panels individually must have breakers, 3 or fewer can be wired in parallel to a single breaker.