My solution to this problem with my Ox after I upgraded to AGM
batteries with less capacity than the floodeds I had before was to get
a reasonably fast (about 1200W) charger. By the time the batteries
are tired I usually am too and I go inside for a while the charger
works and go again later. The only flaw is that if the power goes out
during a storm I'm in deep s***.
Ken