Hi there.

We are having a strange issue with a Sunsynk 16kw. 

3 Phase power into the building, with a huge 170Kva generator installed with a change over switch, the inverter then handles one phase only, so if the generator is running the inverter picks it up as GRID power. 

 

Original firmware (no issues experienced for the one month or so the inverter was installed before the firmware upgrade) :

M 9.0.1.4 / S 1.7.2.5 / C E.4.2.4
After an upgrade:
M 9.0.2.2 / S  1.7.2.5 / C E.4.2.7

 

Since we did the upgrade , from the same day we started to have an issue with the grid frequency (Generator actually) dropping to 0 for a few seconds (as per Solar Assistant) , and thus the sunsynk disconnects from the grid, waits 60s, tries to reconnect, and this reoccurs frequently for the entire load shedding slot. 

I dont think its a generator issue, as the frequency drops right down to 0, as opposed to if it was slightly below the settings on the sunsynk.

 

See attached screenshots. From 10am to 12pm the  generator was switched on. As you can see it causes havoc with the UPSs and lights flickering etc. 

Any ideas?

 

I've read some comments about doing a factory reset on the inverter, some saying N-E relay, some saying firmware update. Based on the issue starting just one day after the firmware update I'm leaning towards this being the issue. 

Edited March 11, 20233 yr by abd7

Some previous comments: 
 

 

And 

 

Edited March 10, 20233 yr by abd7

Glad to note that Deye/ Sunsynk reverted the firmware to the previous version, which has rectified the issue.

Note:
As per the clever people here on the forum,  @Steve87 suggested that the issue is due to "solar export" being enabled, which was causing the issue when the generator was on , slight feed back into the generator and hence disrupting the frequency. This perhaps was a protection / feature on the later firmware that would cause the drop to protect the generator. 

Nevertheless as per Steves advice , to avoid this issue, we will be splitting the grid input and generator input  and using the AUX port to avoid this in the future.