Ah that is interesting now.
So it sounds like the charger puts a load on the generator and stabilises it then synchronization is easier for the inverter to synchronise.
Do you let your generator warm up first or just starts and the load goes straight onto it after a few seconds
Normally, yes — if the generator starts every day at 9 AM, and if I am not testing the syncronisation, usually at working temperature.
In the GX device, the generator warm-up time is set to 180 seconds.
However, in practice, it does not matter whether the generator is cold or already at operating temperature. I would have noticed a pattern long ago if there were any correlation between generator temperature and synchronization issues.
I have repeatedly tested scenarios (with different VE configure settings), where everything is nominal, and then I intentionally disconnect the power line between the generator and the inverter via AC1 to simulate the standard procedure, (start, connect, syncronisation). The goal is to see whether synchronization succeeds again. In most cases, it does not — although occasionally, it does.
Note: Every time the inverter attempts to synchronize with the running generator and the synchronization fails and initiates the overload switch and breaks the connection (an event that lasts a few hundred milliseconds), the household lights dim for about 200–300 ms — similar to the effect of a powerful electric motor starting up. After faild sync, the generator remains running forever until gas tank is empty, unless I am stopping it either remotely or by ignition key.
Ultimately, if I still can’t get them synchronized, I have to alwyas stop the generator to reset its overload protection. Then I restart the generator, switch the inverter to Charger Only mode (which cuts AC-out and temporarily disconnects the household from power), and wait for the inverter to switch and start loading the generator with the charging current. The maximum current is set to 10A in VE Configure – General tab for AC-in 1.
As soon as inverter connects the charging begins always, and power is restored to the household in parallel. After that or anytime later, I quickly toggle the inverter switch from Charger Only to Inverter ON. If the switch is done quickly enough, there is no inverter shutdown or sync issues or interruption of any kind. Everything continues as if I hadn’t made any switch at all!
After that, everything works as expected until the system stops the generator.
The next morning 9AM, the same issue usually starts all over again, although occasionally synchronization succeeds without the workaround described above.