A fridge is a big load.
It takes lead a minimum 6 hours to get to Full no matter how many amps available in bulk stage.
Thus, prioritize solar unless driving 8-hour stints daily.
But PSOC half the cycles, only getting to Full the other half - as per endAmps - is better than most.
Ideally match Starter and House in that scenario, use an adjustable LVC rather than stock ACR.
The two act as a single bank as long as SoC remains well above what's needed for the Starter half to crank.
The LVC isolates Starter at that point, all House loads carried by House half only from then on, try to get both recharged ASAP.
Yes wear will be a bit uneven, especially if you take House down to 60% DoD or lower.
So swap them around monthly. If Lifeline, can equalize at that time as well.
This setup is not nearly as good as a dedicated Starter and say 400Ah of House bank, but makes the most use of limited resources.
All worth consideration. The CTEK system I have functions as you described WRT charging behaviour between House & Start.
Before summer is out, I need to conduct a true test of the power consumption of my fridge in hot conditions over 24 hours so I have more than an educated guess to work with.
I'd have to dedicate far more weight for a 400Ah SLA House bank than I'm willing to spare. Before going that route, I'd more likely use a 200Ah LFP House bank, installed in an under-the-truck bed tray. I know PSoC favours LFP, so that might be worth doing, along with enough solar capacity to keep it going for 5-7 days. That's about as long as I can see backpacking away from the truck without resupply, at least if I was taking a trip where I left the fridge running in my absence.
Again, I need some real numbers to determine power consumption to figure that out properly. I'd hoped that Firefly batteries might be around the cost of LFP, but unsurprisingly, there's no free lunch at the battery counter.
And what is meant by "away from the truck"?
I'm referring to time spent parked while I'm out hiking etc. Otherwise I need to consider the battery going flat after a day or two parked.
I did manage to get three days out of my G31 AGM battery and the fridge during warm weather in Canyonlands NP, but I knew I was pushing the limit. It also wasn't really hot weather, and I was able to leave the truck cab windows down, with a DIY
Reflectix boot over the fridge. I'm amazed that manufactured fridge covers are usually black.