I took a chance and ordered a 70ah LiFePO4 battery from china through aliexpress it was 522.00 shipping included. it was mainly for weight (22lbs) reasons. I had trouble with the first charger not keeping up with the load so I bought the convert/charger. They make one that’s not the panel box just the converter PD9100L. I think that would have been a better choice but I wanted the AC bus, now I’m not so sure about needing the AC.
It took 7 weeks for the battery to arrive but one day it was at the door.