We have a mid-sized ARB and plenty of solar. It will keep things frozen in the driveway (full sun, low dust) for weeks. Obviously that's not smart in terms of battery wear, but I've gotten back from camping only to get absorbed in business work hours later more than once.
While out and about, it is mostly a matter of cleaning the panel off and not camping under shade. Of course this may self-defeat being able to sleep in, so that's a trade-off. That trade-off can be managed by idling for a bit, or moving after waking up, but it's not ideal.
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'99 EB ex ENG KSWB news van, low rent 4x4 conversion (mostly fixed by now), home built interior.
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