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I've got this boat and it's got 2 gigantic batteries in it.. with one of those switches that allow you to pick battery 1, 2 or run them in parallel.

My question is how do I setup a solar charger to keep both batteries charged when not in use?

I understand I can use 1 solar panel and use a controller that allows a connection to both batteries, but what happens when I switch that switch in the boat to parallel? Will that cause a problem, especially when the boat is running? I was hoping to setup something where the solar would always be connected to the batteries.

Thanks!
 

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sorry late to the party joe.
a schottky diode is the answer!
click here for schottky diode info
one way flow of power.
leave the solar on the battery bank 7/24
and the best thing is the reverse drain is super low.

most good solar panels come with these or have charge controllers that have the diode in the system.
so a dual battery solar charge controller is always a good answer for a plug and play unit.
 
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