You are right on target.
We used solar panels in the military where we had a few additional computational requirements to factor in. None worked as well as advertised but all were usually a step above the hand powered generator - which was a great 20-minute workout except that it extended over several hours. The term "cranky" took on new meaning.
Solars are great on boats left in the water with long rests between sailings - the battery can be nicely topped off when you take her out.
Stan
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