My first post here.
I am planning on using my 2019 F-150 AGM/alternator to charge my three 100 Ah Battleborns in my travel trailer. Both my truck and trailer have chassis grounds and they are mechanically and electrically tied together. So far, if I understand correctly, that would suggest using the less expensive non-isolated 12-12 30.
Now for the harder part.
- I use an Anderson WDH hitch which has two large chains that connect via a "Whale Bone" at the receiver and may have metal to metal contact most of the time on the trailer ends of the chains.
- My hitch ball is greased to reduce ball wear from the Anderson weight distributing hitch. And the chains are connected to a polyethylene cone shaped sleeve that is also greased.
- The Tow Vehicle has only a small wire ground via the 7-pin.
These paths all work just fine for the LED trailer lights and electric brakes.
But for a 30 amp load I have some concern that they are not sufficient for a 12-12 30 to provide a 100% consistently reliable ground path.
Am I over-thinking this? Or would it be prudent to order the isolated 12-12 30 and run both + and - from the truck battery to the 12-12 30 and lithium's? Thank you