The problem is caused by the abnormal voltage of the battery. Please check if the battery voltage is normal. If the battery voltage is the problem, check the battery or battery connections. If the battery voltage is normal, but the issue still exists, please check if the inverter can detect the battery voltage. If the battery voltage cannot be detected by the inverter, please check if the power cable between the inverter and battery see if it’s in good condition (sometimes due to the battery terminals not being crimped tightly). If the above troubleshooting is done but the problem persists, replace try to replace the BMC.

The root cause is that when the user stacks the batteries, the SOC of each battery is not consistent, causing the system to enter a balanced state.

Solution:

Connect each battery separately to the inverter, charge it to 20% or 30%, then discharge it to 10%, and measure the battery voltage, which is usually 97V, make sure all battery voltages are 97V, connect the batteries together, charge them to 20% or 30% by the inverter, and then set the inverter as “self-use mode”.

The battery module should be stored clean, dry, and ventilated indoors with a temperature range between -10℃~+35℃, avoid contact with corrosive substances, keep away from fire and heat sources, and charged every six months with no more than 0.5C(C-rate is a measure of the rate at which a battery discharged relative to its maximum capacity.) to the SOC of 40% after a long time of storage.

Nope, we already have a DC switch on BMC and we don’t suggest you add an external DC switch between battery and inverter. Because it may influence the precharge function of the battery and cause hardware damage on both the battery and inverter if you turn the external DC switch on later than the battery and inverter. If you already installed it please make sure the first step is turning on the external DC switch, then turn on the battery and inverter.