RV electrical system upgrade complete

[HammaMan]

Using a 5.0 F-150 connected to my RV trailer wired with Li batteries, inverter, solar and the usual WFCO converter/charger. I chose to avoid the whole discussion of what will this RV do to the truck via pin 7 by isolating the truck with a 20A DC-DC charger. To my surprise this set-up is pushing 17.7A to the batteries. I tested with shore power and solar disabled. Enough power that I'm upgrading the 12GA wire to 10GA on the DC-DC charger. The bigger issue is the auto detect WFCO not finding the battery to be a Li. But that's a different discussion and I have that solved.

What's the output of the unit (v)? I'm guessing you have LFP batts? So long as your charging method gets to 14v, you're about 97% full and that's good-nuff. What's the minimum input voltage of your DC/DC boost charger? The truck has about a 20' run of 12ga back to the connector itself. A 20a load at 14.2v is going to end up leaving about 13.1v at the 7 pin and should be more than enough to power your boost charger. What's the distance from your boost charger to the batts? If you can count the feet on one hand, 12ga is plenty big enough.

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