adding additional batteries - help with wiring - Ford Powerstroke Diesel Forum
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Old 03-14-2013, 10:24 AM
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adding additional batteries - help with wiring

I'd like to add 2 additional batteries to my setup. I would like all 4 to be charged using the single high-output alternator, but I would like the additional batteries to remain separate from the starting system when in use to ensure that if they become fully discharged I will still be able to start up the truck. Is there a simple way to do this or am i forced to run all 4 batteries in parallel?
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Old 03-14-2013, 11:36 AM
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They sell a thing that seperates them I can't recall what is is tho, car guys use it for stereo's tho to run dual batts
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Old 03-14-2013, 12:00 PM
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i did some further research and it looks like i just need a battery isolator like how RVs are set up. I wasnt sure if they were using separate alternators to charge those batteries or not. I've got an espar, winch, and inverter I'm running that i dont want draining my starter batteries when i'm out in the sticks.
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Old 03-14-2013, 12:02 PM
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yeah all you need is a heavy duty relay so 2 batteries are disconnected when the key is off.
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Old 03-16-2013, 02:45 PM
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With that nice cap on the bed, you could also add a few solar panels to the roof and a charge controller......
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Old 03-16-2013, 09:00 PM
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You have a few options depending on budget.

1) Parallel the batteries and use a manual disconnect switch for the auxiliaries.

2) Parallel the batteries with a relay to disconnect the auxiliaries. Power the relay from the ACC circuit or a switch. Down side is if the dead batteries connect when your trying to start, the additional load may keep you from starting.

3) Parallel the batteries with a battery isolator. This will only connect the aux batteries for charging and keep them isolated when the truck is off.

4) Parallel the batteries with a relay controlled by a battery isolator controller. All the functions of 3 with the added benefit of being able to automatically jump start yourself if the primary batteries die and the aux is charged.

#4 is what I use along with a 500a Tyco relay designed for a electric car and some 4/0 cable to connect everything together.
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Old 03-16-2013, 09:33 PM
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could you use a setup like boats use? sometimes they have multiple batteries and charging banks.
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