Sunsynk fault 56 Inverter tripped

[Thys LOW Elektries]

Good day, a client phoned last night telling me that they had no power in the house.
On investigating the situation I found the following
Fault 56 on the inverter, low dc, and no ac or pv input.
The breaker between the inverter and changeover was tripped and refused to reset.
After switching from Inverter mode to Eskom mode with the changeover everything worked normally.
The breaker that supplies ac to the inverter was on and the voltage tested normal at the top and bottom of the breaker.
Will be going back there this morning to open the inverter to test and see if the inverter had tripped inside the inverter

The system had been installed three months ago and it had not been giving problems since.

Any advice would be welcome

[GCE]

Sounds like there was an overload on the output of the inverter causing the CB to trip and then dragged the battery down below DC voltages cut off.

If you can check the BMS you will more than likely find that the inverter asked for to high a current for to long causing battery to trip out

Shut everything down and bring back up

[Justloadit]

How long did the breaker remain on before the trip?
If it trips instantaneously, then there is a major problem with the inverter.
If the circuit breaker takes a good few seconds to trip, it could be that the Mains Battery Charge Current is set too high, so the load current and battery charging requirement may over load the circuit breaker.

[Justloadit]

During the last 24 hour cycle of load shedding, the 4 hours off, 2 hours on from say 16H00 to 10H00 hours is the worst case, as there is constant load on the inverter, and no sunlight to charge the battery, and on top of that in Johannesburg we had a day of rain, in which there was maybe a third of the typical sun radiance on a sunny day.

It may b e the client is not aware that the batteries can not supply the demand as when the grid is running, and need to be educated to conserve the battery power by not using unnecessary equipment on, such as washing machines, irons, stove, geyser, pool pump or heaters.

[Thys LOW Elektries]

Feedback on trip
Every time there was load-shedding a dc voltage fault appeared in the inverter log.
We had two days of rain and little to no sunshine.
Batteries went below their amps and Eskom was off, thanks to load-shedding. Everything that could go wrong did go wrong.
The client is an ice factory with a bunch of freezers and ice machines. Time for more batteries.

What I find interesting is that the mains between the inverter and changeover only reset after the breaker in the inverter was reset.
Since the breaker in the inverter is out of sight it might cause a "short" so that you know it had tripped. Just a guess on my side.

Thanks for all the advice from everyone. Nothing serious just a system that can't cope with the demand at certain times.

[Isetech]

F56 DC busbar voltage is too lowGenerally cause with the battery problem possibly a damaged BMS.If you experience in M56 fault then you need to focus on the battery, the battery cables, the battery connections, battery discharging parameters and the the general condition of the battery.

• Check or battery cables are nice and tight good connections
  
• If using parallel checked all battery cables are the same length as the batteries are lowvoltage compare to the mains but very high current than the cable that is veryimportant we should all be the same length
  
• Check the C rating of the battery
  
• Check the invert at maximum discharge setting
  
• Checked inverter maximum power setting ( Max sell Power )

[Thys LOW Elektries]

Sorry for the slow feedback and thanks for all the advice.
A 30 Amp 4-pole Schneider breaker was the culprit. It finally stopped working and stayed in the off position, and didn't reset like the previous times
The clients didn't know they were running on battery and pv only, so they run the system till the batteries reach the shutdown level.
Tanks once again for all the feedback