If your van isnt plugged in to keep batteries topped up, then no solar will be charging them.
Not really a problem if you have lithium and disconnect them, last for months if left on 70% charge with no load.
if wet batteries then you need a way of keeping then topped up.
there are methods to get round it all, tell us a bit more, how long, what batteries size, type, how much solar etc, and if you have access to plug the van in to keep charged
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