mikerin

Hello, everyone! We have the same problem with our UPS station consisting of three Deye SUN-12KSG04LP3-EU inverters in parallel mode and eight Deye SE-G5.1 Pro-B batteries. The problem is that the Inverter cyclically charges and discharges some batteries from the assembly, reducing their service life and wasting electricity. Because of this, the batteries gain cycles unevenly, in fact some batteries wear out more that twice as much as others. This happens if you set the SOC level of the batteries to 100%. At the SOC level of 98%, the battery becomes static, but the calibration and balancing of the batteries of the assembly does not occur. As we managed to find out, the inverter charges the battery to the voltage 58.4V, then it begins to discharge it to the voltage below 53.0 V. At the same time, the SOC of the batteries starts to drop, and when it drops to 99% on one of the batteries, this battery starts charging again to the 58.4V level, and so on in a cycle. Is it possible to do something about this problem? We think that the problem can be solved by making a change to the firmware, for example, by lowering the threshold for triggering the additional charge to 98% or by changing the logic in some other way so that there is no wasteful cycling of the batteries. But [email protected] does not see the problem with it. PS/ The firmware of the units is up to date. maybe using Butt V or % will solve the problem, but we can't disable the connection with BMS for security reasons.