Hybrid inverter problem (battery overload)

[kadexorek]

Hello dear forum members,

I have a problem with the hybrid inverter this model: https://pl.aliexpress.com/item/1005002546425884.html (instruction attached). Power 2400W, PWM regulator, max voltage 80VDC.

12 180W panels (in parallel) are connected to the inverter, working on a voltage of 36V, each max current 5A (60A in total, but the panels used so certainly will not pull out more than 55A, although I doubt it).

The problem is that every few days the inverter starts to go crazy, disconnects the 230V voltage at the output (no electricity at all in the house) and blinks error 03, excerpt from the manual:



Hybrid inverter problem (battery overload)
"Battery is over-charged. / The battery voltage is too high."

I don't know where it comes from and what it means. The batteries look like they are overcharged, unfortunately, but I can't understand what's causing this situation.

I have batteries connected to the inverter in parallel four sets of 2x12V:

2 x GEL 22Ah NEXON (24V, 22Ah)
2 x GEL 22Ah NEXON (24V, 22Ah)
2 x AGM 40Ah MWL 40-12 (24V, 40Ah)
2 x AGM 40Ah MWL 40-12 (24V, 40Ah)
A total of about 3kWh 124Ah.

This problem also occurred when only the first NEXONs without MWL were connected to the inverter.

I am looking for a solution to the problem, but so far I have failed The worst thing is that the inverter turns off the output voltage (230VAC) and blinks, beeps all the time.

So far, the only solution to the problem is to disconnect the batteries from the inverter for a while and reconnect. Then everything starts working properly.

The current operating settings of the inverter:
01 - Sbu
02 - 30A
03 - APL
04 - SdS
05 - AGn
06- LtE
07 - Ltd
09 - 50Hz
11-20A
12 - 23V
13 - 27V
16 - CSO
18 - bON
19 - ESP
20 - LON
22 - AON
23 - byE
25 - FEN
26 - 28.2V
27 - 27.0V
29 - 21.0V
33 - EEN
34 - 29.2
35 - 50
36 - 120
37 - 30d
39 - AdS

Generally, the house can "work" for about 3-5 hours on these batteries and it seems to me that it is a bit small for this capacity ... after this time, the converter returns to the "bypass" mode and switches 100% to the mains. Except that the standard load in the house in the evening is about 300-400W, so it should probably be a little longer

 

[robby]

Have you measured the battery voltage when this happens, using a meter? Mixing 22 & 40Ah packs could also be an issue.

 

[kadexorek]

The problem also occurred when only 2 x 2 x 22Ah (NEXON) batteries were connected.

Unfortunately, I have not measured the voltage yet, because the inverter works at my father's house, and when I am there, it is enough to disconnect the batteries for everything to start working properly.