FoxESS Community - Owners & Installers Forum

Hi all,

I’ve installed the foxess_modbus_EVO integration by Adam Newberry, but I’m seeing some strange behaviour when trying to change the inverter’s work mode.

Whenever I try to select Force Charge or Force Discharge, I get this error:

"Failed to perform the action select/select_option. Unknown error."

I’m also seeing incorrect mode changes. When I change the mode, the system initially accepts it, but then it automatically switches to a different mode. For example, if I’m in Peak Shaving and select Self Use, it changes to Feed In First instead. And if I then switch it to Back-up, the mode ends up showing as Unknown.

Has anyone come across this before? Any idea what’s causing it or how to fix it?

Thanks!

Brian

First check that there are no schedules set or enabled in the inverter via www.foxesscloud.com/v2 - delete any that are there.
It is also possible that some of the EVO's modbus registers are different to those used in that integration.

IIRC force charge/discharge via modbus may not be available on some firmware versions

I have checked there are no scheduled or enabled via www.foxesscloud.com/v2.

nrb501 wrote: ↑Fri Mar 27, 2026 8:35 am First check that there are no schedules set or enabled in the inverter via www.foxesscloud.com/v2 - delete any that are there.
It is also possible that some of the EVO's modbus registers are different to those used in that integration.

IIRC force charge/discharge via modbus may not be available on some firmware versions

I'm having the same experience, and looking at the code, version 2 some of the registers are incorrect. Despite correcting this I'm still not able to get the work mode to stick. Not sure why but I'm trying to troubleshoot