I added larger capacity batteries to my battery backup for extended runtime. I should be able to get 5 times more runtime with this setup.
Equipment needed:
Phillips screwdriver
Wire cutter/stripper/crimper
Anderson SB50 connectors (either solder or crimp to the wires)
1/4" ring terminals
1/4" nuts, bolts, and washers
35ah 12 volt battery x 2
ATC/ATO Water-resistant Fuse Holder - 10 AWG with 30 amp fuse
10 AWG wire, red and black, about 3 feet each
Drill with 1/2" hole saw