How to limit the power of the second Fronius

Q&A and troubleshooting
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1

There is a working stand-alone system:
3 X Quattro 48/5000/70
1 x Fronius Sumo 12.5-3 (connected to AC OUT)
16 x Pylontech US2000

The system is working but not enough power, at peak loads I need up to 20kW. I have to limit the consumption in manual mode. The average load is about 10 kW.

Soon I will be connected to a 5.5kW grid, I want to add a second Fronius Sumo 12.5-3 (connected to AC IN).

Need help, how to configure the ESS considering that the excess energy cannot be fed back to the grid? Which fronius should I make the main one?

2

No GX device? So you running the system without BMS control?
https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom

With a GX device you are able to control the Fronius inverters:
https://www.victronenergy.com/media/pg/Energy_Storage_System/en/configuration.html#UUID-42f56b22-76b3-0c69-57c2-3e54b2e0df4e

1 Like
3

Thank you very much for your reply. The GX device is there! Will it also regulate the Fronius connected to AC IN? Do I need an energy meter still for this? And which Fronius to set master and which slave?