I have a problem with an AB2000. It is stored outside (but covered in a box, so it doesn’t get wet) and connected to two 500W solar panels.
My discharge limit is set to 20%, but for the second time, it has entered a "Battery Low Temperature Alarm" (Error Code: 227), preventing it from charging even on a sunny day. The AC is also connected, and I occasionally see 30W coming in, but the temperature doesn’t increase, and the battery remains in error mode.
The temperature over the past few days hasn't dropped below -5°C, which is well within the advertised limits.
Has anyone experienced the same issue? Could this be a self-heating problem, or is it just false advertising, meaning the battery can’t actually handle these temperatures (even for just a few hours)?