MattyS wrote: ↑Fri Apr 10, 2026 6:51 pm
Some of the registers throwing errors are ones I assume should be working regardless.
Interestingly, the integration seems to think I have a 10kWh inverter. I have a 5kWh. Maybe that's a clue
Ok so my installers HAVE given me a 10kWh inverter version, how nice of them.
I stood there with the installer and we worked together to double and triple check what wire would go where. I'm going to look at the modbus register PDF to see if I can find out whats going on because the integration is suggesting that work mode changing isn't available on my system which is clearly wrong.
tcp://192.168.1.136:502 247: register 41003 is invalid
tcp://192.168.1.136:502 247: register 41004 is invalid
tcp://192.168.1.136:502 247: register 41005 is invalid
tcp://192.168.1.136:502 247: register 41006 is invalid
tcp://192.168.1.136:502 247: register 49203 is invalid
MattyS wrote: ↑Fri Apr 10, 2026 6:51 pm
Some of the registers throwing errors are ones I assume should be working regardless.
Interestingly, the integration seems to think I have a 10kWh inverter. I have a 5kWh. Maybe that's a clue
Ok so my installers HAVE given me a 10kWh inverter version, how nice of them.
I stood there with the installer and we worked together to double and triple check what wire would go where. I'm going to look at the modbus register PDF to see if I can find out whats going on because the integration is suggesting that work mode changing isn't available on my system which is clearly wrong.
tcp://192.168.1.136:502 247: register 41003 is invalid
tcp://192.168.1.136:502 247: register 41004 is invalid
tcp://192.168.1.136:502 247: register 41005 is invalid
tcp://192.168.1.136:502 247: register 41006 is invalid
tcp://192.168.1.136:502 247: register 49203 is invalid
I checked those registers all of mine are invalid except 49203 which returns “1”.
Re: Fox EVO 10-8-H modbus registers
Posted: Fri Apr 10, 2026 9:08 pm
by AdamNewberry
Any firmware updates available for the unit?
I remember they had to update my firmware from the install.
Re: Fox EVO 10-8-H modbus registers
Posted: Sat Apr 11, 2026 6:26 am
by MattyS
AdamNewberry wrote: ↑Fri Apr 10, 2026 9:08 pm
Any firmware updates available for the unit?
I remember they had to update my firmware from the install.
my installer did do a couple of installs, but it appears there are much more recent versions. I'll be speaking to my installer.
MattyS wrote: ↑Fri Apr 10, 2026 6:51 pm
Some of the registers throwing errors are ones I assume should be working regardless.
Interestingly, the integration seems to think I have a 10kWh inverter. I have a 5kWh. Maybe that's a clue
Ok so my installers HAVE given me a 10kWh inverter version, how nice of them.
I stood there with the installer and we worked together to double and triple check what wire would go where. I'm going to look at the modbus register PDF to see if I can find out whats going on because the integration is suggesting that work mode changing isn't available on my system which is clearly wrong.
tcp://192.168.1.136:502 247: register 41003 is invalid
tcp://192.168.1.136:502 247: register 41004 is invalid
tcp://192.168.1.136:502 247: register 41005 is invalid
tcp://192.168.1.136:502 247: register 41006 is invalid
tcp://192.168.1.136:502 247: register 49203 is invalid
I checked those registers all of mine are invalid except 49203 which returns “1”.
it has an AI that you can ask questions about the code etc. Despite my issues with AI in general it may be quite useful.
Re: Fox EVO 10-8-H modbus registers
Posted: Sat Apr 11, 2026 7:09 am
by AdamNewberry
I forgot who told me, maybe it was even fox, but I understood that 9.x firmwares are development, typically ship with a factory unit and must be updated.Fox allow you to update firmware via the fox cloud app yourself now. Go to the device tab the click the device icon. It should show you what upgrades are available.
Re: Fox EVO 10-8-H modbus registers
Posted: Sat Apr 11, 2026 7:54 am
by MattyS
AdamNewberry wrote: ↑Sat Apr 11, 2026 7:09 am
I forgot who told me, maybe it was even fox, but I understood that 9.x firmwares are development, typically ship with a factory unit and must be updated.Fox allow you to update firmware via the fox cloud app yourself now. Go to the device tab the click the device icon. It should show you what upgrades are available.
I've just checked and that option is not there. on the device screen it doesn't say any updates are available
Re: Fox EVO 10-8-H modbus registers
Posted: Sat Apr 11, 2026 8:00 am
by AdamNewberry
On the iOS app?
Re: Fox EVO 10-8-H modbus registers
Posted: Sat Apr 11, 2026 8:01 am
by AdamNewberry
May be worth firing an email off to fox. They were pretty quick to update mine via support ticket before the self
Update feature came.
Re: Fox EVO 10-8-H modbus registers
Posted: Sat Apr 11, 2026 8:04 am
by MattyS
AdamNewberry wrote: ↑Sat Apr 11, 2026 8:01 am
May be worth firing an email off to fox. They were pretty quick to update mine via support ticket before the self
Update feature came.
I'm on Android. and that is the exact page I'm looking at . no updates, no bubble, no red dot.
I've messaged my installer.
Re: Fox EVO 10-8-H modbus registers
Posted: Sat Apr 11, 2026 8:06 am
by AdamNewberry
Sorry can’t be of more help. I hope (and suspect) the firmware update will fix it! I couldn’t get the integration going until I got firmwares updated.
Re: Fox EVO 10-8-H modbus registers
Posted: Sat Apr 11, 2026 9:17 am
by MattyS
AdamNewberry wrote: ↑Sat Apr 11, 2026 8:06 am
Sorry can’t be of more help. I hope (and suspect) the firmware update will fix it! I couldn’t get the integration going until I got firmwares updated.
No need to apologise, your advice and integration is of great help to me Thanks!
Re: Fox EVO 10-8-H modbus registers
Posted: Sat Apr 11, 2026 3:02 pm
by MattyS
Modbus all up and running now. Firmware update did the trick. Still need more though. Will speak to Fox
Re: Fox EVO 10-8-H modbus registers
Posted: Sun Apr 12, 2026 9:42 am
by AdamNewberry
Glad it’s sorted and working.
Re: Fox EVO 10-8-H modbus registers
Posted: Tue Apr 14, 2026 12:45 pm
by MattyS
Hi there Adam/all,
I'm trying to understand modbus a bit more and how to adjust/ add sensors into my home assistant without borking your great work.
I've seen that register 37611 "ambient temperature" isn't being populated by my system, it's showing as 0°C.
Also I'm trying to find a way of reading and writing to the battery warm up function which is at register 53400 to 53415 ( for a 2 BMS system)
Would you know if this is possible?
Edit: just found the actions feature in HA, and I can see that ambient temperature should be possible to get, but it's gain 10 which I assume means value x10.
The warming feature appears to be accurately showing as on, with start and end temperature reporting as per how my installer has set.
Interesting.
Re: Fox EVO 10-8-H modbus registers
Posted: Wed Apr 15, 2026 2:52 pm
by youngsyp
We're back on for our install, now booked in for 27th April. Seems my installer put some pressure on NG and they have come back allowing the install with the inverter set to export 3.68kW. They're also in the process of upgrading our LV connection but, that will likely take a while to complete. But, I'd hope we can then export at the full capacity the inverter will support.
As I had the opportunity, I thought I should maximise the array. So I've gone for the 495w Aiko panels (from 475w) and from 14 to 18 panels, as we have a west facing aspect of the roof that could take the 4 extra panels. For the extra up front cost for another 1/3rd peak output, was really a no brainer.
This now means that I need to go back a re-read the entire thread in case I've forgotten or missed anything.
Paul
Re: Fox EVO 10-8-H modbus registers
Posted: Wed Apr 15, 2026 3:51 pm
by MattyS
youngsyp wrote: ↑Wed Apr 15, 2026 2:52 pm
We're back on for our install, now booked in for 27th April. Seems my installer put some pressure on NG and they have come back allowing the install with the inverter set to export 3.68kW. They're also in the process of upgrading our LV connection but, that will likely take a while to complete. But, I'd hope we can then export at the full capacity the inverter will support.
As I had the opportunity, I thought I should maximise the array. So I've gone for the 495w Aiko panels (from 475w) and from 14 to 18 panels, as we have a west facing aspect of the roof that could take the 4 extra panels. For the extra up front cost for another 1/3rd peak output, was really a no brainer.
This now means that I need to go back a re-read the entire thread in case I've forgotten or missed anything.
Paul
Nice! Extra panels is ALWAYS worthwhile. My installer gave me an extra panel for free because it'd fit.
Hope your installation goes well.
youngsyp wrote: ↑Wed Apr 15, 2026 2:52 pm
We're back on for our install, now booked in for 27th April. Seems my installer put some pressure on NG and they have come back allowing the install with the inverter set to export 3.68kW. They're also in the process of upgrading our LV connection but, that will likely take a while to complete. But, I'd hope we can then export at the full capacity the inverter will support.
As I had the opportunity, I thought I should maximise the array. So I've gone for the 495w Aiko panels (from 475w) and from 14 to 18 panels, as we have a west facing aspect of the roof that could take the 4 extra panels. For the extra up front cost for another 1/3rd peak output, was really a no brainer.
This now means that I need to go back a re-read the entire thread in case I've forgotten or missed anything.
Paul
Nice! Extra panels is ALWAYS worthwhile. My installer gave me an extra panel for free because it'd fit.
Hope your installation goes well.
Thank you re the install wishes. Me too!
I really like your signature. I think having that, on a board like this is insightful. I'll follow suit.
Paul
Re: Fox EVO 10-8-H modbus registers
Posted: Wed Apr 15, 2026 4:39 pm
by MattyS
I've just created a fork of the Evo modbus GitHub to see if I can get battery warming and ambient temperature to work. I'm not a dev by any stretch but I know a tiny bit about yaml and I'll be scanning the modbus documentation and existing files to see where I can shoehorn the Evo in
Re: Fox EVO 10-8-H modbus registers
Posted: Thu Apr 16, 2026 7:29 am
by MattyS
It looks like "ambient temperature" is actually referring to "battery temperature" and I've got that working along with battery state of health. I'll now be working on getting battery warming sorted out, but it's more complicated because it uses high and low byte register values.
Happy to provide the code updates Adam if that's helpful.
Re: Fox EVO 10-8-H modbus registers
Posted: Tue Apr 21, 2026 2:25 pm
by youngsyp
Having read through some earlier posts in this thread yesterday, I decided to set up my own Solcast account and integration in HA. The revised set up will be 14 panels on a south facing roof and 4 panels on a west facing roof. I've set these up as 2 discrete 'installations' in Solcast, to maximis accuracy. They are working as expected. However, the HA dashboard only seems to be getting data from the main, 14 panel array. This would lead me to believe that the Solcast API is only making available the data for that installation. Have any of you guys had a similar issue? Or maybe offer some guidance?
Cheers,
Paul
Re: Fox EVO 10-8-H modbus registers
Posted: Tue Apr 21, 2026 4:15 pm
by BOD
Hi,
Has anyone managed to get the modes working correctly on the EVO? I have been trying to set them using home assistant but after a few seconds they change.
Any ideas would be appreciated.
Brian
Re: Fox EVO 10-8-H modbus registers
Posted: Wed Apr 22, 2026 4:50 pm
by youngsyp
youngsyp wrote: ↑Tue Apr 21, 2026 2:25 pm
Having read through some earlier posts in this thread yesterday, I decided to set up my own Solcast account and integration in HA. The revised set up will be 14 panels on a south facing roof and 4 panels on a west facing roof. I've set these up as 2 discrete 'installations' in Solcast, to maximise accuracy. They are working as expected. However, the HA dashboard only seems to be getting data from the main, 14 panel array. This would lead me to believe that the Solcast API is only making available the data for that installation. Have any of you guys had a similar issue? Or maybe offer some guidance?
Cheers,
Paul
Answered my own question. I created the 2nd installation after using the API key created after I'd set up the 1st installation so, I don't think Solcast updated the API to include the 2nd installation, after I created that. I just regenerated the API key and reconfigured the integration with it. The figures shot up to where I expect them to be.
I also realised I'd (slightly) cocked up the azimuth for the main array. I used 177 degrees which is just WSW. I should have used -177 which is just ESE. That'll teach me to RTFM!
Has anyone managed to get the modes working correctly on the EVO? I have been trying to set them using home assistant but after a few seconds they change.
Any ideas would be appreciated.
Brian
I tried that Brian. Had an exchange with fox support and at the time the told me they don’t expose changing modes on mode scheduler.
Luckily I was able to do wha I needed with HA automations and the good old force charge periods which you can modify via modbus.
Thanks!
