Generator autostart - inverter overload delay not working?

Q&A and troubleshooting
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1

Does the delay in cerboGX mk2 work for generator autostart - inverter overload? Even though I have it set to 20s, the relay in cerbo clicks as soon as the overload on the multiplus II starts flashing.

tested on 3.60 - 66.

In AC load settings, for example 4000W on the highest phases, the timer works. But as soon as enable in inverter overload, the generator switches on as soon as the overload LED starts flashing.

Bug?

2

I had more time today so I tested more.

cerbo mk2, 3xmultiplus II 5000/48, 3f configuration,
Beta 3.60~69 - generator autostart condition

AC Load condition work OK. Short time exceeding of set values ​​does nothing. After time exceeding, generator will start.

inverter overload - even a short overload will still force the generator to start after the set time has elapsed, even if the inverter is no longer overloaded.

3

I’m moving it up…

4

@KRUP85

Thanks for your report.
I can’t reproduce this on v3.60~80. Could you please update your system and test again?
If the issue then still persists, I’d like to have a look at your system.

Thanks,
Rein.

5

I did a little more in-depth testing. autostart enabled only battery voltage, inverter overload and inverter temperature. ver 3.60 ~80.

inverter overload - wait 60s to start, wait 30s to turn off.

There is a 2200W heating element on L1 of the inverter and I turn on the kettle (2200w) to it.

And now it starts to get interesting. Of course the LED immediately flashes that L1 is overloaded. If I turn off the kettle after 30 seconds, the generator does not start. and everything works OK.

However, if I wait 45 seconds and then turn it off, the Cerbo will wait another 15 seconds and then close the relay and turn on the generator.

Btw remote support is enabled.

6

Hi @KRUP85,

The overload flag is not cleared immediately when the high load is turned off. I suspect the flag is still active 60 seconds after the kettle was turned on, so the generator is started with the overload condition.

I wouldn’t say this is a bug.

And the original issue with the overload condition delay being ignored seems to be resolved.

Regards,
Rein

7

So if I understand correctly, the information from the inverter that it is overloaded simply remains active for a while even though the LED is no longer flashing. So generally speaking, set the time for about a minute longer and there will be no problem. Otherwise yes, I agree, it no longer behaves like it did at the beginning, so the problem has been solved. thanks for the support.

BR
Petr