Couple of questions about DC-Dc charging
I've been thinking about adding a DC-DC charger now that I've added 400 amp hours of AGM batteries. There are lots of useful posts but I haven't run into a couple of things I'm curious about. One ...
Forum Discussion
otrfun wrote:
Folks have no choice but to use the proper gauge cables with their inverters. Use too small of cable with your inverter it simply shuts down. Not the case with a dc to dc chargers. They will silently ramp up current draw until either your fuse or alternator gives up the ghost.
Most tow vehicles fuse that "charge" (12V/B+) wire in a 7 pin trailer harness at 40A-50A. That would be about 500w-600W (@12v).
If you want to use a DC-DC charger that can draw more (like a Renogy 60A) you should install a larger "charge" wire from the battery. That wire should be fused at a maximum of 100A.
The fuse will protect the alternator.
