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t3mschm2d avatar image
t3mschm2d asked

Fox ESS used as a PV inverter for the Victron ESS

Hello community,

I'm currently planning a conceptual PV system for a friend of mine. We want to use a mixed system with a 12kWp AC coupled FOX Ess PV inverter, a 9kVA three phase Victron MPII system with 30kW/h Pylontech US5000 and a 5kWp DC coupled Victron MPPT. I have some experience with all the Victron components so this should be no problem BUT I have never used a Foxx ESS PV Inverter. We would like to use the Foxx inverter as it is quite competitive in terms of price and performance. Does anyone have experience of running a Foxx ESS inverter on a Victron ESS system? Due to the fact that Foxx ESS inverters are able to communicate using Modbus TCP with the SunSpec data structure, I assume there should be no problem for the Cerbox GX to detect the inverter, right?


PS: The Fox ESS inverter is placed at AC-IN so no worries about Overloading the 3 times 3kVA MPIIs :D

ESSPylontech
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Alexandra avatar image Alexandra ♦ commented ·

@t3mschm2d

Since it isn't listed as supported, you may or may not win with Comms to the Cerbo.

You could just add a supported energy meter and meter it to the Cerbo that way. I assume that is why you want it connected.

It won't need to frequency shift the Fox really on the input. I would assume as well that you are also wanting to feedback that already would have its own ecosystem for that?

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ejrossouw avatar image ejrossouw commented ·
@t3mschm2d I am curious to understand why AC coupled PV, apart from price. Do you require a total of almost 24kW during the day? My thinking, if you start with a clean slate, DC-DC charging is more efficient and when you have a daytime grid failure, the DC charging can continue when the AC PV shuts down. Furthermore, if you have critical loads connected, the loads will benefit from the solar and with finally with DC PV there are no limit as with AC coupled PV on the output.
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