Looking at ESS system with Quattro 2: Cerbo already calculates the combined Fronius (AC) & Quattro (DC) combined import / export to the grid.
However when changing the ESS grid feed maximum in Cerbo settings, it doesn't seem to make a difference. The feed in goes above this max setting (Fronius can't produce more than this setting so it is not Fronius throttling issue)
Is this a known bug?
Or does the Fronius need MG50? Surely not when AC coupled?
Manual of ESS / Cerbo / Fronius doesn't seem to clarify this (surely common) scenario...
ESS manual does state the below:
Fronius needs to be set: "Data export via Modbus to tcp."
Again this seems redundant when the Cerbo doesn't need to actually control it.
In some places, it seems that this may even need an ET112 meter (see below). Surely this isn't needed with Fronius on AC & communication with Cerbo?
5KW Fronius AC PV > connected to INPUT of Victron Quattro 2
Cerbo GX shows the output of the Fronius, it calculates the total going back to the grid from both Fronius and DC Victron.
Can it limit the Quattro feed in without controlling the Fronius AC PV?
The Fronius has maximum 5KW, so all Cerbo has to do is Feed in from the DC to make up to the 5KW when Fronius is under 5W.
(If the Fronius is already producing 5KW, the Cerbo just needs to throttle MPPT so there is no extra feed in).
This would surely be a very common set up in Australia as 5KW is the maximum feed in for many residences.