FoxESS Community - Owners & Installers Forum

Has anyone run into this with a FoxESS H1 inverter after recent firmware update?

I’m controlling mine via Modbus in Home Assistant, and I’ve noticed that if I change the Work Mode (e.g. Self Use → Feed-in First), the inverter switches it back within a few seconds.

After a bit of digging, it looks like the new “Remaining Time Mode” might be overriding whatever I set via Modbus. For example:

- If Remaining Time Mode is set to Self Use, it forces the inverter back to that even after I change it to Feed-in First.
- If I flip Remaining Time Mode to Feed-in First, then select Self use mode in HA the inverter overrides changes made to Work Mode

So it feels like there are now two competing controls, and the inverter is prioritising one over the other.

Has anyone figured out:

- Which setting takes priority?
- Whether both need to be set together via Modbus?
- Or if there’s a way to disable the Remaining Time logic entirely?

Would be really interested to hear how others are handling this in Home Assistant.

Ultimately I would like to use HA to switch between Self Use mode and Feed-in First at different times during the day dependant on a number of conditions such as current solar generation, forcast, home use etc....

You have to turn off all of the Fox controls, as they will overrule your HA settings, then run everything from HA.

I think I may have got to the bottom of this issue. If I go to the Fox web portal and open my inverter -> Work Model I can see any schedules I have setup plus an additional one that is set to Self Use and has a time of 00:00 to 23:59. If you delete this schedule it is auto recreated. so must be the way Fox are creating the Remaining Time mode. However, there is an option to disable all schedules, if I do that I can then change the work mode via HA without it reverting back to the Remaining time setting. Not sure yet if the diable remains in place but time will tell.