21.6 V without much amperage behind it is not likely to be hazardous as far as I know. However, it will give any critter or human a nasty jolt upon chewing through the insulation. If still concerned, you could use coax cable for wiring with the shield at hull potential. It's unlikely any critter would be inclined to wear out teeth trying to cut through the shield. Or, you could slide a rigid tube or even conduit over the wires you're concerned about.
Interesting comment about the PV electricity accelerating corrosion if one side is in the water and the other on the boat. With attention to polarity, I suppose PV could be used instead of a sacrificial anode.
Cheers
Halden
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