On my bass boat I run my 36v Ultrex with 3 100ah LiTime batteries. I also use 1 50ah Chins battery to run my Lowrance Live 12, black box, active target, and Helix 10.
On my 18ft CC, I run a 24v Riptide using 2 50ah Chins and my electronics are on the 50ah DJLBERMPW battery.