One of my customers has quite a huge genset for his house. It is a Atlas Copco 32kVA 3 phase genset. When the grid goes down, the generator kicks in and will supply his (big) house.
But he has problems with unbalanced load. The case is:
When he starts charging his EV (7,4kW @ Phase 2). A lot of LED-lights in his house start flickering.
Current: L1 uses 6.5A, L2: 24.8A and L3: 7,7A
The voltage (sinusses) of al phases are very steady (maximum of 2% of deviation)
The power factor L1: 0.43, L2: 0.99 and L3: 0.82
I suspect the flickering lights are connected to L1 but I don’t know for sure.
As Atlas Copco says the Genset is working properly we have to find another solution. And yes; personally I would sell that genset and go for a good Victron ESS. But my customer wants to keep that genset.
So my suggestion is to use 3 quattro’s 48/8000 in combination with a very small battery (5-7kWh) to balance the load. In my opinion it should be able to equalize the load on 3 fase of the genset and so get al those Pf’s back to (almost) 1.
Imho 3 Multis should improve the situation. The question is, if you connect the genset at AC-in or AC-out. Pls. read about the 1:1 rule in the ESS manual. In case of AC-in (Quattro?) you need to have a grid meter. Then setup the ESS for individual phase regulation. This might be a little less efficient as 2 of the 3 devices go to charging mode to level the phase currents while the third Victron device supplies the high EV charger current. The grid meter detects the currents and Multis are going to meet the given grid setpoint. In comparison to a genset, the wye circuit of 3 Multis (or Quattros) supply a strong neutral up the the nominal load of each device.
Anyway, it seems you need to do more investigation about the reason of LED flickering. Maybe there is a weak neutral conncetion anywhere in the installation? Power factor of L1 is suspicious low for 6,5 Amp. Is that inductive or capacitive and from where it is coming? PF should not depend from unsymmetric loads. What happens if you connect the EV charger vom L2 to L1? How are the neutral currents for the diffrent situations?
As long as you dont have reasonable DC production by PV modules, the Multis are no replacement for the genset. As transformers also suffer from asymmetric loads, in Germany we have single phase chargers limited to 4,2kVA. As far as I know, some early Renault Zoe models are the only one what allows charging 32Amp single phase. That model ist obsolete for a very long time. Maybe you can do anything to improve the EV charging 3 phase?
Nope. The battery needs to be able to provide the power for all 3 quattors if the genset (or grid) gets rejected.
24kw system needs at least a bank that can provide 500 amps discharge.
Although noting your load and generator size, you will need at least 10kva per phase if they are kept in a air-conditioning cool room. 15kva if not. And then an adjustment to the battery bank size accordingly
But done right. essentially what you making would be a hybrid genset.and ypu will achieve the balanced loading on the genset.