Jacob Scoville
New Member
- Joined
- Jul 6, 2020
- Messages
- 23
Hello! I’m looking to charge my 400 AH battery bank with a second charger while driving. Currently I use a 50 amp renogy DC to DC charger/MPPT. I’ve upgraded from a 150 to 270 amp alternator to increase the alternator charging (I have high load stuff like 3D printer, pressure cooker, tons of batteries for work) and I connected a 60 amp DC charger but it doesn’t seem to want to work in parallel. I’m wondering if I need to add a diode or something somewhere in the system. I have a cable from the positive on the starter to a bus bar (with a fuse between) , and the right size CB’s between the bus bar and each charger. All negatives go to the same negative bus bar. I’m wondering if I need diodes between the positive on each charger and the battery to prevent some kind of backfeed. When charger B is turned on I notice the input amps on the renogy reduce while the output stays at 50 amps which leads me to believe the renogy is somehow sensing charger AB’s output amps and thinking they are it’s own. Is that because neither charger has isolated negatives?