This one deserves a 🤦♂️ with a happy ending. In the garage I leave the ArkPak plugged into AC with the Dometic CFX75DZ running off the Renogy 100ah LifePo4. “Apparently”, I unplugged the extension cord to use the wall receptacle and neglected to re-plug it back in. IOW, the battery was not being recharged while powering the fridge. I discovered this 3 days later when I glanced at the ArkPak control panel and noticed that the indicated battery capacity was 5%. The fridge was still running without a hiccup, no low voltage shutoff. Had the previous SLA battery still been in the unit it would have shut down long ago. Although there was nothing mission critical inside the fridge…unlike the 18# turkey from the week before…it was reassuring to know that I was getting full power from the LifePo4 even so close to total depletion of the charge. 👍 Thanks to all for their comments re: lithium batteries that lead me to buy one.
On another note: I bought the ArkPak 730 in what has turned out to be more than a couple of years ago. At the time, it was one of the only units that fit my requirements: portable (albeit very heavy using an SLA battery), capable of holding up to 130ah battery, rechargeable using the truck’s DC system (through a ciggy plug) or my Lance connection in the bed, small inverter, solar ready, and ciggy output ports. But these features are pretty rudimentary compared to today’s units. The “smart charge” system, although programmable to different battery types, is limited to 7 amps. 300 watts of inverter is not much. Limited ports, etc.
I’ve toyed with the idea of building my own box using a WolfPak with hi-rise lid, for both the “savings” and the challenge. I really like the National Luna DC-25 Power Pack but the price tag scares me off a bit. I think I’ve found my workaround thanks to Andrew St. Pierre White (4xoverland) )and Heiner Klarmann (Perth Pro)…the National Luna Auxiliary Battery Box comes with multiple and varied input/output ports and is expandable. Attached to the back will be a DC-DC 25 charger (much quicker than the 7 amps on the ArkPak) and two Anderson connections for battery/solar charging. I’m just finishing up the $$ analysis and product availability and will report back.
For reference you can check out 4xoverland YouTube “Backpacker Build”, basic electrics.