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1.5 watts is a little small. According to how far north you are, winter sun is much lower in the sky and for less time than in warmer months. I'd think 1.5 watts is their maximum rating, under ideal conditions. RV's factory equipped with an RV solar charger is usually at least 5 watts and I wouldn't spend money on one with less than 10 - 15 watts output.
In storage, if you use a cut off switch to make sure batteries aren't connected to anything, I've had fully charged batteries still good after 4 months of Ohio winter a couple of years in a row.
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
58215 | Amorphous Solar Panels| Northern Tool + Equipment
no, not enough...
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.