my trolling motor is 12 volt, use one battery at atime, use to get one full day of trolling with one battery, with solar charger I get two days per battery, the solar panel I use is 60 watt, it puts out 3+ amps, its 26 " by 26". I have it on a pontoon, put it in the chair next to me so that I can swivel it around to put it in direct contact with sun. bought mine from ul-solar.com 1-888-701-0566 weighs 15 lbs. paid $60 free shipping. I like it, it works for me, use to carry three batterys for 3-4 days of fishing, now two will due. also check on e-bay Ibought this one three years ago.
Dave