Battery isolator upgrade?

Submitted: Sunday, Jun 17, 2012 at 21:22
ThreadID: 96332 Views:4862 Replies:2 FollowUps:9
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Just thought I'd ask if there's a better system, before replacing our automatic battery isolator which has failed. I recently noticed the car fridge runs both batteries down and the isolator is not protecting the starter battery.

We have a dual battery system in the car with an isolator and surge protection. Normally the car charges the second battery, and when the camper trailer is connected, charges its battery too via an Anderson plug.

It has worked fine for about 5 years, although a bit slow to charge as there is some voltage drop betwen the car and the other batteries when they are charging from low.

I have read a little about DC chargers and wonder if I should take the opportunity to "upgrade" or change the system, to achieve more efficient charging of the AGM batteries.
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