A 100 watt solar panel, if mounted flat, will give you 5 Amps charging in the middle of the day. Put on two of you have room. It will help some. An MPPT charge controller helps put the max into the batteries. I use a Tracer type from Amazon. These were made for solid wire for street lamps. You need to solder the ends or crimp ferrules to the ends of stranded wire for mechanical strength, otherwise the screw terminal trash the wires ends.
You might want to install a Victron battery monitor to keep track of the power going in and out.
I love solar power. I put 830 watts on my camper and it supports an electric blanket. Boats have less space but I would still have as much as would fit.
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