As part of this 630ah Lithionics upgrade, I chose the
Renogy 50A DC-DC charger to regulate the max charging of the house batteries from the alternator. I installed it in the step compartment (see pic #47 on page one) and have been pleased with it so far. I verified the charge rate directly from my Lithionics battery Bluetooth app while driving. After letting the batteries discharge below 50% to test the alternator charging, I observed the charge rate at 64 amps within a few minutes after starting my 1-hour drive back home from boondocking in the desert for a couple of days. It stayed at approximately the same charge rate for the entire drive. The refrigerator was off for the test but my original 600w solar array was still on. I was averaging about 15-20 amps from solar just before I started home so that was obviously supplementing the alternator charging. Here's the glitch; if you are utilizing the built-in MPPT solar controller as I am to charge the starter battery while in storage, the solar breaker to the Renogy solar panel (1, 50w panel in my case)
must be switched off while driving or the max charge from the alternator will be limited to 25 amps. That's is a pretty weird design in my opinion but no biggie to switch it off while driving. I just open the step compartment and flip the breaker then switch it back on when I park.