Is this a known firmware issue? I've tried updating a couple of times today but each time hit a timeout at 72% with the inverter disappearing from the app/web (although front panel suggested everything was normal) and needing a full power down & restart to reappear.
I noticed this today (yesterday's data) but looking back it seems to be fairly consistent. Each time I hit a FD period, the PV drops to around 140W (from an expected 2.7-3.3kW on yesterday's figures) with pretty much all the export and load coming from the battery. Apart from anything else, that's over £1 revenue lost each day (first world problems, I know).
Is this a known firmware issue? I've tried updating a couple of times today but each time hit a timeout at 72% with the inverter disappearing from the app/web (although front panel suggested everything was normal) and needing a full power down & restart to reappear.
Is this a known firmware issue? I've tried updating a couple of times today but each time hit a timeout at 72% with the inverter disappearing from the app/web (although front panel suggested everything was normal) and needing a full power down & restart to reappear.
Yeah, I've just started noticing it with mine in the hot weather too. Doing exactly the same.
I believe you cannot charge your battery whilst you discharge? I'm fine with that, but I also notice the forced discharging battery runs the home at the same time as exporting. I'd rather the solar power continue running the home and all battery power going to the grid. As you say, we seem to be loosing money the way it is running.
The only thing I can think of is the H1 G2 inverter having a maximum Kw it can handle at any one time. So for instance, 3.6kw going to grid via inverter from battery whilst 3.4kw solar goes to home if cooking etc. via inverter too. Perhaps 7Kw at any one time is too much for it to handle so it shuts down solar whilst it discharges.
Then again, I've made more money in the last few days because of the heatwave, so I'm not complaining.
Would be nice to know reasoning behind it all.
v.1.55/1.73 are latest versions. You can update via app.
I believe you cannot charge your battery whilst you discharge? I'm fine with that, but I also notice the forced discharging battery runs the home at the same time as exporting. I'd rather the solar power continue running the home and all battery power going to the grid. As you say, we seem to be loosing money the way it is running.
The only thing I can think of is the H1 G2 inverter having a maximum Kw it can handle at any one time. So for instance, 3.6kw going to grid via inverter from battery whilst 3.4kw solar goes to home if cooking etc. via inverter too. Perhaps 7Kw at any one time is too much for it to handle so it shuts down solar whilst it discharges.
Then again, I've made more money in the last few days because of the heatwave, so I'm not complaining.
Would be nice to know reasoning behind it all.
v.1.55/1.73 are latest versions. You can update via app.
Attachments:
"The only thing I can think of is the H1 G2 inverter having a maximum Kw it can handle at any one time"
Yes - this is an expected. But what I would expect to happen - and I believe used to happen before the flurry of app and firmware updates over the last year - is that the inverter uses the PV first before the battery for a Force Discharge just as it does for supplying the house load.
With a 5kW inverter and a 3kW PV input, that means a 5kW FD setting would (should) take 3kW from PV and 2kW from the battery. I cannot think of any situation in which someone would reasonably/regularly want to not use the PV. If you truly want to run the battery down then you'd either wait until the sun has disappeared, or you turn the PV off at the isolator.
See this breakdown from October. I was on Agile import / fixed export at the time so controlling it myself. There was a negative import price at 10.30 so I'd have been discharging leading up to it (https://agilebuddy.uk/historic/agile/2025/10/4). Given it's 7 months ago and I didn't know to pay attention at the time, I can't be definitive, but it does fit the data and illustrates my expectation as above.
FD is set at 5kW (on 5kW inverter). House load is 410W. That's being supplied by 2.7kW PV and 2.45kW battery. Contrasted to the current situation where the entire supply would be taken from the battery with PV shut off.
Anyway - Fox have updated the firmware to 1.55/1.73 this morning (self-service update failures being another story) and will investigate "if the issue still persists afterwards" so let's see.
Yes - this is an expected. But what I would expect to happen - and I believe used to happen before the flurry of app and firmware updates over the last year - is that the inverter uses the PV first before the battery for a Force Discharge just as it does for supplying the house load.
With a 5kW inverter and a 3kW PV input, that means a 5kW FD setting would (should) take 3kW from PV and 2kW from the battery. I cannot think of any situation in which someone would reasonably/regularly want to not use the PV. If you truly want to run the battery down then you'd either wait until the sun has disappeared, or you turn the PV off at the isolator.
See this breakdown from October. I was on Agile import / fixed export at the time so controlling it myself. There was a negative import price at 10.30 so I'd have been discharging leading up to it (https://agilebuddy.uk/historic/agile/2025/10/4). Given it's 7 months ago and I didn't know to pay attention at the time, I can't be definitive, but it does fit the data and illustrates my expectation as above.
FD is set at 5kW (on 5kW inverter). House load is 410W. That's being supplied by 2.7kW PV and 2.45kW battery. Contrasted to the current situation where the entire supply would be taken from the battery with PV shut off.
Anyway - Fox have updated the firmware to 1.55/1.73 this morning (self-service update failures being another story) and will investigate "if the issue still persists afterwards" so let's see.
Attachments:
As I mentioned, I am already on the latest versions and getting the same results as yourself.
Could this then be Intelligent octopus flux getting their programming wrong?
I would come off it for 24hrs and play around manually, but as IOF is not currently available, I may not get to come back on.
Could this then be Intelligent octopus flux getting their programming wrong?
I would come off it for 24hrs and play around manually, but as IOF is not currently available, I may not get to come back on.
I believe you can unlink the inverter from Octopus. As per the FAQ:
"If you wish to regain control, you can 'disconnect' your battery from the settings in the app.
Please note: if you keep your battery disconnected for an extended period of time you may no longer be eligible for the product."
The same FAQ suggests they should only be discharging in the 4-7pm window though...
"If you wish to regain control, you can 'disconnect' your battery from the settings in the app.
Please note: if you keep your battery disconnected for an extended period of time you may no longer be eligible for the product."
The same FAQ suggests they should only be discharging in the 4-7pm window though...
I was also having issues with my RCD switch flipping power off and FoxESS came out to look at inverter. In a nutshell, I’m getting it replaced this coming Wednesday with latest firmware updates, so I will see if this issue also dissapears.
If not, I feel like leaving IOF and going to IOn NEXT Optimise tariff. Theirs is a new tariff piloted by customers and now out in beta. Looks at half hourly wholesale prices and gets you optimum savings through an AI assistant or something like that. FoxESS equipment works with this new tariff. I’m looking more into it this weekend.
If not, I feel like leaving IOF and going to IOn NEXT Optimise tariff. Theirs is a new tariff piloted by customers and now out in beta. Looks at half hourly wholesale prices and gets you optimum savings through an AI assistant or something like that. FoxESS equipment works with this new tariff. I’m looking more into it this weekend.
Well, after a bit of back-and-forth, here's an answer of sorts:
"I can see that Force Discharge (BAT) is currently active, which prioritises battery discharge. This will also limit how PV power is used."
The obvious question now is who on earth actually thought that throwing away several kW of PV is an acceptable thing to do, and why did they change it (without telling anyone) from how it used to work last autumn when it definitely did NOT just dump it?
"I can see that Force Discharge (BAT) is currently active, which prioritises battery discharge. This will also limit how PV power is used."
The obvious question now is who on earth actually thought that throwing away several kW of PV is an acceptable thing to do, and why did they change it (without telling anyone) from how it used to work last autumn when it definitely did NOT just dump it?
Actually, it looks like this could be the answer. I did come off IOF yesterday and setting FD manually does appear to prioritise PV over battery. Reading between the lines (it would be good if Fox could actually just accurately describe what they mean) the Force Discharge (BAT) setting will prioritise battery, and that's what Octopus are using. FD (BAT) is not available to us, but is available to them.karaokekid wrote: ↑Fri May 29, 2026 10:52 am Could this then be Intelligent octopus flux getting their programming wrong?
Octopus are looking into it right now so we'll see what they come back with.
That was a big risk coming off IOF, but great result. Looking at other companies over the weekend, no one else can touch IOF for rates and I see they are not accepting new applications currently, so I will stick with them. Hopefully Octopus can fix the issue with FoxESS pretty quickly while we have the summer here.
Keep me updated with what ever happens please.
Keep me updated with what ever happens please.
I had a problem reconnecting so I'm now waiting to see what the response is. They are happy to switch me to Flux, so if I can't get back on IOF or they don't 'fix' the FD behaviour, I'll stick with Flux or Agile and sign up with Capture. TBH, I'm considering doing that anyway.
I tried disconnect and reconnect today on latest firmware as was having some issues with partial schedules coming through, also been unable to reconnect. What a pain! Octopus were very slow resolving this last time too, took literally months of back and forward.alexls wrote: ↑Mon Jun 01, 2026 7:12 pm I had a problem reconnecting so I'm now waiting to see what the response is. They are happy to switch me to Flux, so if I can't get back on IOF or they don't 'fix' the FD behaviour, I'll stick with Flux or Agile and sign up with Capture. TBH, I'm considering doing that anyway.
Sorry to hear that.
I had a replacement inverter installed today.
I had to unregister old inverter with Octopus Energy.
Guess what happened??????
Yep, you guessed right, it wouldn't let me reregister my new inverter.
Was on with Octopus for an hour doing various screenshots.
Tried getting my firmware updated all afternoon as well with Fox to no avail.
I did update in the app but I know it's not the latest version even though the app said it was!
Anyway, one positive thing being off IOF, when i did manual programming to force discharge battery, it allowed power from both solar AND battery to be exported!!!!!!
Now the lad from Octopus on the phone today did mention there has been a number of reports of battery program issues with Fox that they are looking into.
However, there seems to be two issues now:
1) IOF Registration of inverter ( i thought it may have been old firmware, but as you have latest and cannot get back on, that gets rid of that idea)
2) IOF programming
I hope they do fix this in days rather than weeks or months. I'm just starting to make solar/battery pay and I'm not clever enough to take this on manually.
I had a replacement inverter installed today.
I had to unregister old inverter with Octopus Energy.
Guess what happened??????
Yep, you guessed right, it wouldn't let me reregister my new inverter.
Was on with Octopus for an hour doing various screenshots.
Tried getting my firmware updated all afternoon as well with Fox to no avail.
I did update in the app but I know it's not the latest version even though the app said it was!
Anyway, one positive thing being off IOF, when i did manual programming to force discharge battery, it allowed power from both solar AND battery to be exported!!!!!!
Now the lad from Octopus on the phone today did mention there has been a number of reports of battery program issues with Fox that they are looking into.
However, there seems to be two issues now:
1) IOF Registration of inverter ( i thought it may have been old firmware, but as you have latest and cannot get back on, that gets rid of that idea)
2) IOF programming
I hope they do fix this in days rather than weeks or months. I'm just starting to make solar/battery pay and I'm not clever enough to take this on manually.
Same experience with manually scheduling; export comes from PV as priority with battery filling the rest.
I have had the following response.from Octopus:
"I have escalated this with the team that develop our smart tariffs, to see if we can look into an alternative discharge mode/if this would be possible. I do have to share that there isn't currently a plan to change this imminently, but it is being looked into / explored, and we really appreciate the feedback you've given."
I have had the following response.from Octopus:
"I have escalated this with the team that develop our smart tariffs, to see if we can look into an alternative discharge mode/if this would be possible. I do have to share that there isn't currently a plan to change this imminently, but it is being looked into / explored, and we really appreciate the feedback you've given."
One option seems to be sign up with Capture to manage the inverter (staying on whatever tariff you like). This is what I'm going to do if Octopus can't fix this, and potentially even if they can.karaokekid wrote: ↑Wed Jun 03, 2026 2:13 am I hope they do fix this in days rather than weeks or months. I'm just starting to make solar/battery pay and I'm not clever enough to take this on manually.
Tried again this morning and it's connected and showing in octopus app now. No schedules been sent through yet though so it's just sitting on export priority mode as I left it, and I can't change any setting as expected when connected to IOF. Hopefully I get schedules through later, else I now have the worst of both connected and not!
Managed to register on IOF this morning but it’s not connected properly. Once the device is showing in Octopus, I clicked on it and I see this:
“Uh oh, something went wrong” with a “retry” button.
As I’m seeing this instead of power and battery detail, I assume the interface is still not working.
I have to keep deregistering if I want to change my modes manually then reregistering afterwards just in case.
I do seem to have a slightly different inverter after the replacement.
It’s still a H1 G2 but the WiFi is integrated instead of being a separate dongle that you attach.
They updated my firmware overnight to master:1.55 and manager:1.41 A bit of a difference to my last inverter firmware but they insist it is up to date.
Currently discharging my battery and it is prioritising PV before battery. Seems silly what they are saying and doing. The battery will discharge faster and PV will be lost in the ether.
“Uh oh, something went wrong” with a “retry” button.
As I’m seeing this instead of power and battery detail, I assume the interface is still not working.
I have to keep deregistering if I want to change my modes manually then reregistering afterwards just in case.
I do seem to have a slightly different inverter after the replacement.
It’s still a H1 G2 but the WiFi is integrated instead of being a separate dongle that you attach.
They updated my firmware overnight to master:1.55 and manager:1.41 A bit of a difference to my last inverter firmware but they insist it is up to date.
Currently discharging my battery and it is prioritising PV before battery. Seems silly what they are saying and doing. The battery will discharge faster and PV will be lost in the ether.