My ac500 bc300s didn’t function hardly at all below 40 degrees farenheit last winter, despite being rated for much colder. I’m trying to solve this problem before next winter. Although it would be nice if the batteries functioned as advertised, I’m stuck with what I have. A friend suggested silicon warming mats under each of the units. That seems like a good idea, but I’d like some expert opinions. Last winter my 2 ac500 bs300 couldn’t even run a heating lamp overnight.Thoughts?
The B300S battery has a built-in self heating function, however it will not activate unless you plug a T500S adapter into the B300S directly or plug the AC500 into the grid, only then will it work. Basically grid power if you want to keep the batteries warm. If you are off grid, then a low power warming mat and maybe a small insulation box with some thermostat so it doesn’t roast/cook the battery cells would work too. They have warming sleeves that go over lifepo4 batteries and have a thermostat built in, but a lot of them are designed for the raw batteries with the + and - terminals and not self contained units like the Bluetti.
1 Like
That’s interesting. I wonder if the heater works if you connect a DC charging enhancer to the DC7909 input and then output a small amount of power possibly from the Cigarette Lighter Port on the battery to the charging enhancer using a Cigarette Lighter to XT90 cable. Probably not a good solution for this problem just wonder if it works 
.