Do lithium batteries lose noticeable capacity in South Dakota winters?

[Psaro_Manslayer]

For anyone running lithium home batteries out here in South Dakota like do you notice much of a capacity drop once winter hits? Last year my system seemed to hold a charge fine until temps dipped into the 20s, then suddenly I was seeing what felt like a 10–15% reduction in usable power. My installer said that’s normal for colder weather, but I’m wondering if there’s anything I can do to help minimize it. Do you guys use battery heaters, insulation boxes, or just rely on the built-in thermal management systems? Trying to figure out what’s worth the effort before it gets really cold again.

 

[Anlucia_Light]

Yeah, lithium definitely loses some punch once temps drop below freezing. A 10–15% dip sounds about right. I insulated my battery enclosure with rigid foam panels and added a small thermostat-controlled heater pad like made a noticeable difference last winter.

 

[Even_Vexan]

Cold slows the chemistry, so you get less usable energy until things warm up. If your batteries are in an unheated garage or shed, a simple insulation wrap or small heating pad with a temp controller can help. Just make sure the heater doesn’t fight the BMS like some systems don’t like external heat sources near sensors.

 

[HyruleLink]

I wrapped my battery box with some leftover foam board last winter and saw way less sag. Didn’t expect it to work, but it did. I guess keeping the wind chill off the enclosure matters more than people think. Might be worth trying before buying anything fancy.

 

[Alan]

A 10 to 15 percent dip is pretty normal when winter settles in, especially once temps hit the low 20s. Built in thermal management helps, but it can only do so much if the surrounding space gets cold enough. It could help to insulate the enclosure or add a mild heat source if your system is in a spot that regularly drops below freezing. Do you see the capacity hit more in the mornings or all throughout the day?