overall capacity isnt based on how you use it, its what youve got, how you use it gives up how long you can make it last.
I'm assuming that while driving (and charging) the DCDC is pulling what it can from flat panels on the roof and then making up the shortfall off the alternator..
your usage rate about equals mine but I'm running 220AH of LA (2x115ha 1200CCA n120(ish) truck batteries in parallel) but only 90ishW of solar for maintenance charging and the alternator charges between stops on the run. However I dont have any critical support stuff on the batteries like a Cpap But I can dump over 2000 amps for short periods, my nominal loads (excluding light weight things like led lights, gps and radio)
1. fridge
2. winch
3. electric blankets (girlfriend has
[I]no/I] metabolism or body fat)
4. run the diesel heater.
5. run the invertor for the compressor
almost all of that is short load time followed by a period of "rest" during which the battery can "recover"
this lays out the concept pretty well.
https://citeseerx.ist.psu.edu/viewdo...=rep1&type=pdf
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