Pontoon Boat?

[8gv]

Pretty much what Top-Water said (he's faster than me).

Some boats have a bit of parasitic battery drain when not in use.

A battery switch can be installed to isolate the batteries while the boat is not in use.

A waterproof solar charger panel can help to keep up with the parasitic drain.

If you get a solar charger be sure to wire in a fuse as they often do not come with one.

The unit I use here came from WalMart. The package made no clain of it being waterpoof but it still works after three seasons of sitting on my swim platform.

The West Marine model I use in FL works well but the corner gromets corroded and left a stain on my swim platform. I repurposed some plastic buttons, that previously held bungee straps to my canvas, to keep the gromets from touching the platform.

I do not know if your toon has a bilge pump. If it does then you will need to keep it powered by the battery side of the switch so it gets power all the time.