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I have a multiplus II with cerbo gx, mppt 250/85, and 40kwh storage batteries, all set up as an ess system.
I want to know what the difference is when I see "external control" and "discharging" on my multiplus on the console screen? What does this mean?
When discharging, is it in fact inverting and supplying loads or is it discharging to the grid?
Can someone please explain what the difference is between discharging, inverting and external control?
Thanks
The system is always under external control with a managed battery and just means the BMS is controlling the system via DVCC.
Inverting is typically under a grid loss, AC input ignore or manual selection of the soft switch to invert only.
The others are ESS states iirc relating to battery being discharged (others include recharge, sustain, scheduled etc)
The reporting of this has changed over time and between firmware and GX updates.
So when it states discharging, does this mean it has lost comms with the bms? Or is this all controlled behaviour and nothing to worry about?
No, it just means it is telling you about another state it is in.
There was a period where the only state that was shown was external control which didn't show the various other things the system was up to as part of an ESS, which will involve different battery states.
Nothing to worry about.
If you lost the BMS the system would shout and eventually power off with an error 67 - BMS lost.
The system will just be doing what you have either configured it to do, or what it needs to do, in the event of grid loss/rejection/disconnection.
