this post was submitted on 29 Sep 2023
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Two battery setup in camper (self.askelectronics)
submitted 1 year ago by figurys to c/[email protected]
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I want to change te battery setup in the camper van a bit.

Currently there is a single battery which is charged by either solar, engine or 230v. Then a transformer to 230v to power the outlets.

The idea is to add an extra battery. A lot of people are saying that it isn't a good idea to put those batteries in series or parallel if the batteries are not exactly he same. Now our idea is to switch between the two batteries with the help of some relais and an Arduino or something. So then + of both batteries would be connected to a relay and after the relay we can connect them together. Is this a good/safe way of doing that? Or will we be running into issues that I'm not seeing.

Thanks in advance!

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[–] [email protected] 2 points 1 year ago

12V 200A relays are pretty easy to find (I wouldn't get one from alibaba tho), but that much current requires quite beefy wiring as well. Personally I'd review options to place auxiliary batteries in parallel since that would simplify wiring and the whole system a bit, but as I don't know how your camper is built it can be tricky or you need to sacrifice storage space somewhere.

And as you're placing a battery at the same space where people stay be careful with hydrogen. Charging lead acid battery produces hydrogen and in the worst case scenario, specially if you have a gas stove be dangerous if not lethal.