Should I Leave My Solar Panel Setup Connected in a Winter Cabin?

Overall, keeping the system connected is usually the best choice, especially if you set it up right. Make sure your charge controller isn’t draining too much power when idle and that your panels are getting some sun even in winter. This setup not only keeps everything charged but also prevents the battery from deep discharging. Just be careful with those temperatures—AGM batteries can handle quite a bit of cold, just avoid charging them in extreme conditions. If you have small loads running occasionally, that would work too!

It largely depends on a few factors. If your solar panel can still get some sunlight, it’s generally a good idea to keep everything connected. This way, the panel can trickle charge the AGM battery, which will help prevent it from freezing. Just make sure the battery stays at least 50% charged to avoid any issues. AGM batteries are pretty resilient in cold weather, but they shouldn't be charged at freezing temps. Also, if you notice snow piling up on the panel, try to tilt it or ensure it can shed snow to keep generating power.

Yeah, definitely consider getting a few more panels or a battery warming system to protect your battery during the winter. Something simple like a seedling heating mat could work—just set it to keep the battery warm enough. It’s important not to let it freeze solid, as that can destroy the battery quickly. Also, remember that battery draw from controllers is minimal, but having an insulated box with a thermostat can help maintain the right temperature without wasting too much energy!