I'm planning a near-future Victron installation which is going to look like this :
3 x Quattro II 48/5000 for 3-Phase AC + Cergo GX
I already have a Fronius Primo 8.2, but I'll change it for a Fronius Symo 8.2 as it is too powerfull for only 1 Quattro.
The goal is to have an ESS Assistant running on these, so I'll be grid-connected and the Fronius is connected on the critical-loads side (AC-Out1).
I already searched a lot on the Forum, Webinar and Online Training, and found this respons already : https://community.victronenergy.com/questions/7060/three-phase-off-grid-and-single-phase-generator.html?childToView=7151#answer-7151
BUT, I still don't understand the need and utility of the "switch as group" function for ESS or PV inverter support Assistant.
- In an ESS system, the communication between Victron and Fronius is already through LAN/Ethernet, as the Frequency is already determined by the Grid, so if there is too much power from PV, there is no need for Frequency Shifting, right ?
- With PV inverter Support Asssitant, why can't the Frequency not be shifted if "switch as group" is disabled ?
Why do I need it disabled ? For two reasons actually :
For example, I have 6kW produced from Fronius on 3 Phases so 2kW each. Now I have consumers on one phase that I can not split on two or three phases (EV Charger, big power Kitchen tools), so what happens is that I would have a load of 5kW (2kW direct from Fronius + 3kW from Victron). If the other to phases have no consumers, that would mean that one Quattro is Inverting and the other two Quattros are Charging (2x2kW). BUT if I understood correctly, this is NOT possible if "switch as group" is enabled. What happens in that case ?
I would love to put a one-phase Generator (only for grid blackout) on the master Quattro, so that he is Charging and the other two Inverting. Again NOT possible with "switch as group" enabled. Still, it should be enabled so that I can use ESS (or PV inverter support) for the AC coupled PV. Solution for that would be to buy a 3-Phase Generator, but if I can avoid it...
So my main question is why this "switch as group" function is so important for ESS or PV inverter support Assistant, can't it be left aside as communication goes over LAN ?
Dealers are a little overwhelmed by that kind of question, so I'm contacting the experts here, how would you solve that situation ?
We could also communicate over phone or E-mail but I thought your response would interest the Victron community.
Thank you for reading until here, I hope you understood, if not, just ask ;)