House Battery to Van - Ford Transit USA Forum
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post #1 of 2 (permalink) Old 04-27-2016, 07:54:AM Thread Starter
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House Battery to Van

This may have been covered elsewhere but I'm having a hard time tracking down a general electrical question string.

I'm planning on attaching two 6V 220ah AGM batteries to the starter battery thru a isolator. My original intention was to use two 60A breakers, one near the Van battery and one near the house battery. I think that would be about the max charge limit on the AGM batteries that I am comfortable with for cycle life etc. That way if they were pulling more power during a charge the breakers would trip and I could figure something else out...add more resistance, etc.

If I attach to the power point on the drivers seat there is already a 60A fuse. Depending on draw and sensitivity if the battery loop is pulling more than 60A one or the other would trip. Ideally the easily resettable breaker. Is there any danger in putting two fuse/breakers in line like that? It would be like wearing a belt and suspenders so I may just repurpose the breaker elsewhere.

Also, it's a little hard to measure, seems like the battery attachment stud is 3/16" dia. can anybody confirm that?
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post #2 of 2 (permalink) Old 04-27-2016, 08:53:AM
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No expert here, but it would be my concern that whenever you have pulled those AGM house batteries down, and they are therefor in bulk charging mode, they will be constantly tripping those breakers and/or blowing the fuses. AGM's have very low internal resistance, and can really suck up those amps during the bulk phase.
I would probably bypass the under-seat 60A terminals, and, instead of an isolator, install a 40 or 60 amp Sterling battery to battery charger. That way, your starting battery is fully protected, and the Sterling will regulate how much charge is going into your AGM's, and you won't be tripping breakers and blowing fuses.
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