Below is a link to the solar charger I use in FL and NH.
It yields 3 watts.
I put a carabiner in one corner grommet and clip it on to the boat.
The other grommets on the one in FL started rusting so I sandwiched some plastic canvas cover bungee stay attachments on them.
I did so on the NH boat but it may have been unnecessary at the lake.
That sounds complicated but it is not. See link below for those.
While 3 watts may not seem to need a fuse, everything connected to the battery does.
I installed a fuse on the positive lead for protection.
The cable has a 12V receptacle plug and an alligator clip option.
https://www.westmarine.com/buy/natur...84?recordNum=5
Bungee strays. See photo on site. The white parts will lock around the grommets to keep them off the wet deck or carpet of your boat.
https://www.sailrite.com/Stayput-Sho...SABEgIFP_D_BwE