Work Mode Switching Issues with foxess_modbus_EVO Integration EVO 10-8-H

[BOD]

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

[nrb501]

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

[BOD]

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

[MattyS]

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

[BOD]

Hi all,

I’ve finally managed to get the mode setting working on the EVO through Home Assistant using modbus. I’ve been in contact with Fox ESS support, and after they updated my firmware, everything is now working correctly. I deleted the mode schedule on my phone app.

I have asked Fox support how I can set the force charge and discharge using modbus. Hopefully they will get back to me shortly. They have been very helpful so far.

The firmware versions I’m currently running are:

INV_Master: 1.15
INV_Slave: 1.00
INV_Manager: 0.30
AFCI: 0.37
Software: 2.09
BAT_BCU: 1.004

[SoFather]

Would be interested in your results

I currently have another issue

If I set schedule to force charge it does nothing
If I set “remaining time mode” in the schedule to force charge out side the schedules time it force charges.

If I disable the schedule, not delete it, it also starts to force charges all feels back to front.

Fox tested it said it worked ok for them
I tried it after their email and it worked.
Hours later I tried again and it didn’t work.

[SoFather]

UPDATE 11/5/26

My ISO app auto updated today
It’s now version 2.2.11

What’s new….
• Add relevant business functions for heat pumps;
• Optimization of quick setting function;
• Add one-click detection for battery faults;
• Optimize the password reset function.

Well unless it’s a coincidence my issue is now resolved with Mode Schedule
Hope yours is too

[MattyS]

Yes I've just tested mine and force charge and discharge work now

Now hopefully my automations will work!

[SoFather]

Are you IOS?

[MattyS]

Are you IOS?

Sorry I don't know what that is. I did however just get a fox cloud app update

[SoFather]

IOS = Apple Phone
Android = well Android Phone lol

[MattyS]

Oh right sorry, yes I have an android phone.