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Hello,
a customer has a Easysolar II 48/3000 running with ESS and an ET340.
the AC-out is used for critical loads but never has more than 500w used on ac-out.
ac in is used grid tied and with pahase conpensation.
so multiple times we had the problem is going in overload and not is able to get back working
without shutting ac in down with the circuit breaker.
has someone an idea whats happening on this device?
If it is powering off you may have an issue with LOM detection. see https://www.victronenergy.com/live/ve.bus:grid-codes-and-loss-of-mains-detection
I have run into overload conditions with low power draw and ESS but it was transient, never powered off the inverter and since downgrading the assistant from the latest version, has not reappeared (fingers crossed).
Hello Nick,
yes seems to be the problem.
Found out that customer hast 5 circiut breakers in a row now reduced to 3 and system seems to work well.
Now we have still the problem after some days of work. The system goes in overload.
The overload fault is notclearable without disconnecting the Grid!
So turn Multiplus off and on again in the ccgx will result in new overload warning after restart.
Is this a normal Behavior?
Hi @Michael Schmidt,
As described in the link that @nickdb posted earlier, it is normal for a Multi to report overload in an ESS system with low load when there is a high impedance AC input.
The first thing to do is confirm that this is indeed the cause of the issue, by temporarily disabling the LOM (Loss of Mains) detection. The details of this are described in further detail here:
https://www.victronenergy.com/live/ve.bus:grid-codes-and-loss-of-mains-detection
If that test confirms that the cause of the issue is a high impedance AC input, then you have the option to:
A) find a way to reduce the AC input impedance (such as by shortening the wire run, or increasing the size of the AC cable to the grid, and confirming that all connections are making excellent electrical contact).
B) If the issue stems from BEYOND the customers house wiring, on the grid supply itself, when wire upgrades are not possible, then you may need to use an alternative Loss of Mains detection and isolation system, such as a Ziehl Voltage and Frequency relay.
