Anthropic...I have a Minn-Kota 80lb thrust trolling motor
Solar Battery Charger...I believe is 5-Watt
Optima Blue Top 12 Volt Battery
The solar works ok, maybe because I only use it once a week...if that.
But after cloudy days it seems rather weak.
Maybe it's not near enough wattage... it would seem from what HighFlyer stated.
So I bought a marine charger I throw on the battery when I arrive at property.