Buy a slightly bigger solar panel, park your vehicle with the windscreen facing about north, and leave it inside your vehicle. You can get some panels with eyelets in the corners to add some suction cups to make it easier... use a budget solar charge controller to make sure you don't overcharge your battery (though unlikely).
Something like this would work ok: https://www.burnsco.co.nz/solar-pane...YaAtZpEALw_wcB
and this:
https://www.burnsco.co.nz/solarland-...YaAtZpEALw_wcB
though the cheap charge controllers on TM are ok as well:
https://www.trademe.co.nz/a/motors/c...ing/4791828389
or kit: https://www.trademe.co.nz/a/motors/c...ing/4793599786
I've used one to keep vehicle charged at home, and one for the local scout group when they go on jamboree with a portable solar panel and battery (leaders need to charge their phones!)
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