Paralleled a few 12Vs together in the bottom of a waterproof tub, with a USB, a cigarette lighter, and a standard 3-prong style outlets mounted on the tub. Packed in cutout foam and false floored into the bottom, and tub is also used to transport electronics,
Etc. Tub also doubles as a table. Nice to have a dry box as well, as a floorless hub with a heater going all day gets wet.
Can charge my cell phone and flasher at the same time while running an LED light strip on a dimmer that velcros to the roof. Can watch movies, charge USB headlamp, make coffee, run a hot plate to fry fish, etc. Used a charger from an old flasher to recharge the batteries, and replace batteries if needed.
Best thing I’ve ever invested in for hub fishing, and built it myself for relatively cheaply. A simple portable power source can take hub fishing to another level.