If you're just adding more battery capacity to an existing install, it's as simple as adding additional batteries. That said, finding space in a van could be the biggest challenge.
If you're looking at Lithionics, cost must not be an issue? If you're trying to effectively run A/C from battery storage, plan on something over 1k Ah of storage. You might do with less... but if you're ONLY on battery power, you're going to have trade-offs.
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Be creative, and have a fun life...
...and don't be an @**hole! -Ken Block
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