I have a 12' half gable shed on the side of my garage for my snowblowers. I also use it to hang longer metal stock from its rafters, and store sheet goods (bottom left in shed pic) when I get them cut on the long side of the sheet so they fit into my stomp shear. Once they are cut up smaller they come into the shop onto the materials rack I recently cleaned up.
But I still need to trickle charge my two snow blowers in the shed as well as keep a 12V Optima Deep Cycle battery charged. It powers the alarm system, and is a backup if I need to boost things.
Battery Tender now makes solar panels complete with the charge controller built in. This was a 15W panel I got off Amazon for the metal shed before the covid apocalypse hit. Glad to finally mount it. This means I no longer need to park my snowblowers in the shop at night to recharge the batteries after using them. There ain't a lot of room in the shop left, so even the blowers crash the metal working party when they are inside charging. With this panel, there's no extension cord trailing to the shed, and no loss of shop space during snow days.
It's supposed to be weatherproof, and looks well sealed. I've had great luck with their chargers, including a 24VDC model I bought for my RC Lawnmower. The solar panel is bigger than you technically need for the little 5 Ah batteries on my blowers, but the shed is in between houses, shaded most of the time, and mostly needed in the winter months. When designing battery packs for the LED lights I use on my blowers, I calculated the Ah such that they provide juice for two runs—one day after another. That way if I only get a few hours of cloudy sunlight, I'll still be OK on day two. I've found if you double or (preferably) triple the size of a solar panel calculated for non-ideal conditions, you get close to what you need. Time will tell I guess.
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