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12g should be a great plenty for your parallel wiring. If you choose a stranded wire vs solid it will be that much more efficient energy conductor.I got me a Coleman 18w solar panel dirt cheap at an auction last year with that thought but haven't taken the time to play with it yet. Just haven't had the call but it'll happen. I would think solar could really stretch your power capability significantly. One thing I do know is it's better if you can charge each battery on an individual circuit rather than trying to get them all back through the parallel wiring. Particularly with Li batteries and their BMS. It's the same reason that boat with onboard charging have multiple banks, one charging bank per battery.
I got me a Coleman 18w solar panel
I can't find many other supply places online anymore.
For connectors, I like to use shielded heat shrink spade connectors, ones where both the male and female are both shielded. Spades are pretty standard for ice fishing sonar units. Those also allow alligator clip connections easy enough.
Another option for charging up in the field would be an inverter to use with your battery charger... I'm assuming your sled will be anywhere your setup will be. I've got one in the toolbox on my wheeler, if I need to freshen some batteries I can plug the charger/batteries into the inverter on the wheeler, go putter around the lake and check out some scenery or do a little hole hopping {leaving the wheeler idling} and put a fresh charge on what I need. I'know some older sleds wont have the charging system to pull that off, but seems I remember a new high end machine in your setup...
Bart,I would like to make a copy of your orange water-resistant battery box for your fish finder. Would it be possible to get a list of parts you used and construction details?SmilingBob
I basically got everything from amazon, except the orange box. The toggle switch is waterproof. Good luck with the project and please post pics when your setup is completed.