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Old 11-16-2020, 04:54 PM   #1
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Installing DC-DC Charger for Lithium Battery Isolation

I am installing a Renogy 20-amp DC-DC Charger to isolate the lithium batteries in the trailer from the tow vehicle’s LA batteries. My plan is to run 4-gauge wire from the vehicle battery to an Anderson power pole connector at the rear bumper (with a 30-amp fuse in the positive line). I will connect the lines into the trailer to the charger input, and then run lines from the output to the positive and negative bus bars.

I will disconnect the positive and negative lines that come in through Bargeman 7-pin connector and cap them.

I know I will not get much charging from this system, but I will get some. I am not running one of the larger chargers (40 or 60 amps) because I am not sure the computer-controlled alternator in my 2014 F150 Ecoboost could handle a larger load. Mostly I just want the isolation.

Anybody see any issues with this plan or lay-out?

Thanks, Dave
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Old 11-16-2020, 04:59 PM   #2
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No issues, you have a very good plan, in my opinion. I think you could go 30 or 40A even with the wiring and connectors you have in mind. But check your alternator output first, it should be over 130A to go larger than 20A.
We do these installs just about every time when converting to Lithium.
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Old 11-17-2020, 12:18 PM   #3
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Another thought to make your plan even more appealing would be to use the existing charge line, route it through a relay that makes it active only with ignition on, and then use the trailer side of it to turn on your dc/dc charger. Like a remote switch that is fully automatic. Of course you would need a dc dc charger that allows this function, such as Victron Orion or Sterling product. Perhaps your Ford's charge line is already controlled by the ignition switch, I am not sure.
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Old 11-17-2020, 02:40 PM   #4
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That is actually (kind of) what I had in mind. The Renogy has an on/off circuit plug on it. I am going to wire it to the running lights (on the trailer circuit) which I always use when towing because they power my rearview camera. That way, I do not mess with the 7-way plug/circuit as I use the truck to tow other trailers than the AS.

Thanks for your advice. Always like to have a second (or more) opinion(s) on my designs in case I miss something.
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Old 11-17-2020, 03:21 PM   #5
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I have installed the same system and it works great. you said you were going to cap the positive and negative on your pig tail. I would leave the negative alone. I actually ran a single “ignition on” hot wire plug mounted next to the Anderson plug on the tv.
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