I started to ask, but let it go. 48V sounds like a lead-acid realm to me. With modern battery technology, 100+ seems doable.
I'd be looking for something to integrate road and house loads with shore, solar and regen (Serpentine belted altermotor replaces the starter and alternator) inputs.
What I intend to get as soon a I sell a car is the EcoFlow Delta.
Quote:
EcoFlow Portable Power Station | EcoFlow DELTA Power Station
https://ecoflow.com
"The EcoFlow DELTA is the best portable power station for emergency backup power or off-grid activities such as camping and tailgating." "The EcoFlow RIVER is a mobile power plant for all your gear." "Unlike many traditional power stations, the EcoFlow RIVER supports fast charging. It can charge from 0-80% in 1 hour."
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What would you think of a drop-leaf tailgate with a pop-up boat tail/porch roof?
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edit: It looks like you have 5 posts. Can we have a closeup of the front edge of the van with something for scale? I'm curious about routing those twin stacks. You might be able to scavenge chrome perfed heat shields off a big motorcycle. It should really help the underbody aero.
If the perfs are inlets and the outlet is a [vertical slit] Coanda nozzle, exhaust heat would help push you down the road (not that you could ever tell.
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When you think about the area over the cab, the most advanced designs mimic Luigi Colani. I'll have to look for an example.