7-pin power for lithium batteries in travel trailer

[jh90731]

If your lithium battery came with a BMS then they will not overcharge. The alternator is only going to see the batteries as a load and will continue to put out amps up to its rated capacity. I have 2 100 AH lithium batteries on my RV and I use the standard 7 pin plug and never had a issue with my alternator overheating. Like someone else said the 7 pin does not put out enough amperage to cause a issue with your alternator. The DC to DC converter is used if you want to charge a low charged RV battery as they usually have a larger cable direct from the battery to supply more amperage. If you are worried of low battery capacity when boondocking, then get a solar panel and solar controller, they will charge your batteries on they way to the campground and will continue charging when disconnected from the truck.

Yes, the batteries have an integrated BMS and we have a factory installed 133 watt solar panel with a Victron MPPT 75/10 controller. Also, I've swapped out the factory non-lithium compatible AC-DC converter in the trailer with a new lithium compatible model. My main concern was making sure the alternator would not get stressed as some travel trailer user forums suggested. Based on the great feedback on this RAM forum confirming that the alternator is limited on the amps it can send back due to the limitations of 7-pin connection I'm good to go. Thanks again.

 

[Joe Merchak]

cool.. have a great time camping.