3tons,
I can say my first inverter was 2500 watts. I powered it with 875 amp-hours of marine batteries because I did not want problems with high demand. It was able to run the roof air.
The current inverter/charger is 3000 watts (but really that is VA). Again I powered with 556 amp-hours of AGM reconditioned telcom jars. I love my load (not voltage) support!
In neither case was overloading the bank a consideration.
If there were an affordable Li formulation that does cold and surge too, I'd love to have one. So far the only cold unit is Li Titinate--which has a reputation for low amps of draw--so I'd need six or seven to meet my needs @ $1800 EACH.
I've seen more than a few LiFePo4 that are 100 amp-hours in size but the BMS limits to 50 amps.
Now my tires have timed out, and rubber is through the roof, so since the telcom jars are still ok, (load test) I won't be able to afford the SiO2 that I want (which can do 400 amps from a 100 amp battery, continuous).
Covid has not helped--2020 income dropped by 75% and 2021 it is less than 50% of 2019. 2022 is 1/3 gone and it appears I might do about the same as 2021.
Off tomorrow on a ten day work trip.
