So
@sands
These AIO units are easy ,,, just buy them & wire your van to them, but I am guessing now you see the biggest issue with them ,,,
Charging them up from the Van.
The other biggest con in some of them is
“they self consume” their battery power to the tune if 33% per day.
Much of the self consumption is the interior inverter or other electronics. It varies from AIO to AIO.
Then there is on many of these AIO the “repairability” of them. If something craps out after warranty can you repair it or is it
bricked ?
We had a change in how we use our van, so I simply added a DC2DC charger ,, Problem solved. That is what you get with a DIY individual component system.
The last thing, is the efficiency factor. I charge with 12vdc & use 12vdc.
With your AIO, you will PM Van 12vdc ~ 120vac ~ super charger to battery ~ 120vac or 12vdc ,,, 4 power or energy transformations.