I ran the truck an hour and a half the other day. My Victron 30 amp dc to dc got pretty darn hot. Hotter than I wanted to touch. During that time, the 2, 200AH lifepo batteries were charged from 79% to 93% each. Minimal solar now, about 0 to 175 watts for a couple hours of winter time, low sun days. My 45 amp Boondocker has stopped working. Exterior fuses are good but there may be an interior fuse. I'll have to pull out the unit to inspect since it's in a difficult location. I plan to replace it with a Victron 3000 watt inverter charger when I get to Quartzite. This is why you need proper equipment to charge Lithium batteries, they can accept so much current they can destroy your alternator burning it out. My guess is the old boondocks couldn't handle the batteries either.