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I live in New Zealand and have purchased three 10kWh LiFePo battery packs (total 30kWh, 3 x DL-LFP-51200's) from Delong Battery Technology (DelongTop) from Shenzhen, China. I have been having a problem with the three packs getting progressively further apart regarding their individual SOC % (State of Charge). It got serious a month ago when we had several days of wet weather, and two of the packs were showing about 45% SOC while one pack was only showing about 25% SOC.
I noticed that when the packs were being charged their BMS sent the highest SOC value of the 3 packs to the Growatt Inverter/Charger, (displayed on the inverter screen), but when they were discharging the BMS sent the lowest SOC value. This meant that I was not going to be able to use the extra storage that was in the two higher SOC packs when the inverter inevitably shutdown due to the minimum SOC alarm setpoint being reached, (set to 20% SOC).
It is impossible to get any sensible answers from the Delong Support people because none of the engineers speak English. Has anyone else encountered this SOC difference problem from the Delong battery packs before? I am also keen to find out how many of these new Delong 10kWh pack have been sold into NZ and Australia.
I noticed that when the packs were being charged their BMS sent the highest SOC value of the 3 packs to the Growatt Inverter/Charger, (displayed on the inverter screen), but when they were discharging the BMS sent the lowest SOC value. This meant that I was not going to be able to use the extra storage that was in the two higher SOC packs when the inverter inevitably shutdown due to the minimum SOC alarm setpoint being reached, (set to 20% SOC).
It is impossible to get any sensible answers from the Delong Support people because none of the engineers speak English. Has anyone else encountered this SOC difference problem from the Delong battery packs before? I am also keen to find out how many of these new Delong 10kWh pack have been sold into NZ and Australia.