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As Evil said, the solar will stop working once the car starts


Proud BTrol Owner
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I have a 160w solar panel which I connect to the aux battery via an Anderson plug when I am camped. Keeps the fridge going forever.
I have not run the solar while charging the aux from the...

You usually won't get both to charge all the time while driving.

Depending on the the Solar reg settings it will 'see' the Alternator voltage of 13.8 or more and think the battery is fully charged...