Saad Ali

There is nothing in inverter logs.

The installers verified all cable connections and made sure nothing is loose. Attaching settings one by one.

I have a newly installed Deye compatible (Inverex) hybrid 12kW inverter connected to new lead-acid batteries (4 x 12V 230AH) and 570W x 26 solar panels. This setup is installed 3 days ago. The inverter exhibits unpredictable restart behavior under conditions of grid going completely off and on: Sometimes, it restarts when the AC grid power goes completely off. In this state the batteries are fully charged. Once the inverter restart completes it transfers to batteries for load. After a while it turns off non-essential load and keeps running the essential load. In other instances, the inverter does not restart when the power goes off but does so 10-15 seconds after the grid power comes back on. During that time, AC power goes off and runs smart load, until batteries reach certain voltage at which point it turns off only the non-essential load and keeps running the essential load. In this condition, when the AC power comes back on, it waits for some time to connect/sync with grid and then restarts after which it again takes some time and then connects/syncs with the grid just fine. This strange behavior is not always exhibited by the inverter. Sometimes either behavior is exhibited or no behavior at all. We have tested every iteration today and we could not conclude what the problem is. At one point we believed that there was a short circuit somewhere in out internal wiring, for which we turned of all the load that we suspected could have caused the problem. We have checked all the wiring connections to ensure that no wiring is loose. The guy that installed this setup even factory reset the inverter today. After trying every iteration, the installer has recommended that the inverter is taken to the manufacturer lab for further diagnosis. The voltage on 2 of the phases is between 233-235 volts and the 3rd phase is between 239-250 volts. This does not change drastically. Could there be anything in the settings that might be causing this strange behavior. This all happens when AC grid goes off and on. In the day time the inverter prioritizes the taking energy from the solar panels as much as we need which is at minimum 2.5 kW and at max under around 3.5kW.