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I built up a solar charging system a few months ago for outside storage in an RV lot. Works great. Bought all the parts online. Keeps the batteries topped off at all times.
I have a 2017 E-Series and I did not remove my batteries last winter or hook any form of other charger to them from Nov.-March. When I hooked up the hose and fired up the boat in late March to get ready to go out, according to my Connext screen, both batteries seemed to be fully charged, and lasted the entire 2018 season with no worries of running the stereo or starting. As of right now, my 2 solar panels are all she's getting again. I'll be the guinea pig to see if the solar panels are worth it without any other form of maintainer.
And if it doesn't go well, I get to replace them with AGMs and add an on board charger in the spring.
