House bank batteries

[Double Horizon]

I have found that there is room to add a 4th GRP-24 battery (to the house bank) in the battery compartment. However, if you really want to maximize capacity, there is also room to replace the GRP-24 size batteries with (4) GC-2 (6-volt) golf cart batteries. If you wire those in series/parallel they can be configured as a 12-volt bank of batteries with approximately 450 AH capacity vs. about 320 AH for the (4) GRP-24 batteries.