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Because of the weight-hassle factor I have never considered solar rechargers for a canoe trip. My daughter did some work on a material that could be used as a display device and solar collector.  So the fish detector of the future could charge its own batteries.  What I am reading about solar collectors is the push is on to get the most watts out per dollar invested at the expense of watts out per pound and square inch.  This will make solar collectors on your house profitable but it may sink your canoe.

Spent a couple of nights on Kashakokwog.  I was cleaning the groups fish on a rock away from camp.  My back was killing me so I was hurrying up to get done.  When the fillets were removed from the first fish I threw the carcass as far out in the water as I could without looking up.  When I finished the next fish I did the same thing only the sound of the carcass going splash was replaced by the sound of an eagle just over head.  I looked up to see the eagle carrying the carcass away.  The eagle had timed it perfectly to catch the carcass before it hit the water.
Hope you like Kashakokwog as much as we did.