Setting:
ESS batterie 48V @ Imax 74A (3,5kWh)
MPPT 100/35
Cable 50mm2 between batterie und Phonix
Café machine approx. 1,5Kwh
App Victron schowing approx. 1600VA
First sec. ok, Voltage start to ocscilate between 198VAC - 235VAC
Graphic shows betwenn 900VA - 1600VA (still in green area on the App)
1,5Kwh gives only approx. 30A on AC side.
Can the oscillation be because of the Cos Phi / inductance of the café machine ?
Any trick to avoid to install a bigger Phoenix ?
Thank you
I think theres some mixing of units
Now 74Ax48V gives us 3500W, but thats power, not energy (Wh or kWh)
The question is, is the battery capacity 74Ah or is the max discharge rate 74A, because thats two very different things
I guess the coffee machine is rated at 1500W
The phoenix, i guess a newer smart model since you have connection on VictronConnect, is showing 1600VA
The datasheet says 2000VA or 1600W at 25°C continuous, so were close to the rated power output, which should not be an issue right away. But is the battery capable of delivering that power as well?
Coffee machines can be tricky to run depending on the model. They do quickly switch their heater and high pressure pump on and off, so i assume thats what you are seeing on the voltage. The phoenix is trying to keep up with that fast switching load, but maybe is not able to. Even though the power is not actually too much.
1500W divided by 230V would be 6.5A, or about 31A on the 48V DC side
I dont think its an issue of power factor.
Before trying to fix something, i guess its necessary to find out if the issue is actually the inverter. If you have another device with about 1500W, like a hairdryer or a teakettle, you could try if your setup is capable of delivering that power when its not switching on/off all the time.
@chrigu :
The ESS is a Pylontech US3000C with 3.5Kwh, max dischrage rate 74A.
So yes, the is capable of delivering the approx. 30A needed.
700W PV with MPPT 100/35.
Test done with sunny weather
i can imagine zhat the inductance to high is.
The idea to test the inverter with for ex. a fan is good.
The cafe machine was also plugged on a phoenix 24/3000 and it works…so probably the phoenix 48/2000 and this café machine are nopt compatible 
The US3000 limits itself to 37A, that is the DCL it will be sending to the inverter if there was a GX so one battery is undersized for that inverter.
At lower SOC it will also reduce this limit.
Any transient could cause a problem.
Were do you see that ? according datasheet Max discharge is 74A ? What do you mean with DCL ?
Max and continuous are different things. The BMS sends a discharge limit of 37A to the system when connected over CAN.
Without a GX you won’t see it, but that is what it is expecting nonetheless.
There have been far too many issues with pylontech batteries where the system has been undersized and the battery is working harder than it should do.
Never size to max power ratings.
But nothing is connected over CAN and I don’t understand why you assume the BMS limit to 37A if the datasheet mentionne 74A (max 60sec)
Can you explain ?
I am not assuming, every 3000C battery, and there are thousands, sends this as its limit.
That you are not using a GX or CAN is irrelevant, as that is still what the BMS is configured for.
Max is a number that it is capable of in bursts, but it does not want to be operated like that as the battery would not last, so they are configured for normal operation at 37A.
Here is a bank of 4, see the limit the battery is setting? 148/4 = 37A. That is what you size for. This limit will drop as the battery charge gets low.
