I am fighting with a new install.
Venus GX, 16pcs pylontech, hub, venus, 3x multiplus-II, grid connected
Due to distance to the farm entry where i have the ET340, i use external control and Modbus/TCP to control the system.
The system worked for some days, but strangely the FI in the pumphouse (quite far away) started tripping in the night with no obvious reason, might be unrelated.
Now the system is in error state, "grid relay fault", it constantly throws the SMA solar system off-grid when it tries something, and shows error codes on the multipluses which are not documented. My installer has no clue and things "some problem down the line" but there are no changes and the system worked for some days without any issues.
Hardware defect in the Multiplusses ?
Problem got worse because the Pylontech batteries where pretty discharged and used the rest of the energy to power themselves (and possibly the Multiplusses ?), so now they are "dead", the can hub from pylontech is "dead" as well as it feeds of the 48V of the battery.
I am lost and currently my installer seems to be clueless also, he thinks it is probably my problem as i use external control (ESS mode 3) ...
here a short video of the error blink codes of 2 multiplus, the third one does the same as the right one.
HELP, please. I have now cut the multiplusses from the grid so that at least the solar production works and is not constantly thrown off.