FoxESS Community - Owners & Installers Forum

Yes, we have a wired Chint bi-directional smart meter with its own CT inside the EPS gateway (we have whole house backup)
I have re-terminated the cabling between it and the inverter as the idiot (sorry, fully qualified electrician who knows far more than me ) use two paralleled pairs (the whi & whi/blu and ora & whi/ora) to connect between the gateway and the inverter.....yes I am aware that electrically it will work but doing that totally defeats the point of using twisted pair! ....just in case anyone is unsure, twisted pair is used to eliminate noise and interference as any noise is induced into both wires but out of phase so it cancels out, two parallel wires will pick up noise like a radio aerial

It's happening so often now I made this up to get to the reset setting quicker

Hi

I am surprised it lets you keep doing this. Ours returns "failure" after a few successful resets.

Our inverter is a Fox ESS 6KW Hybrid Inverter H1-6.0-E-G2-WL in G99_UK mode.

Did you manage to read the error log to see what error is triggering your g100 s3?

I have asked the installers to ground the foil screen of the cable when they get round to installing it - it is in a trench quite close to the garage ring main cable, so would be vulnerable to picking up mains voltage in common-mode (due to capacitive coupling). I think RS485 should be good for up to 7V of common-mode , but don't want to test it.
The twisted pairs wont help with common-mode noise (they prevent differential mode noise caused by magnetic fields, as each twist is the opposite polarity to the prior).

Duncan

The error log was blank ...but that MAY have been after I reset it, its happened so many damned times I cant be sure!
At least now I can reset the G100 problem without clearing the error log.....

it does seem that the grid voltage is going above 253V for short periods... I found the Vac 10 min average setting but it is disabled and I cant seem to change it....also found these settings...are they correct ?

Hi

I think the 262.2V setting is correct, and can't be increased (I tried). Our grid is always high, in the 245 - 250 region, but doesn't seem to be a problem

Interestingly, Fox have (with my permission) remotely disabled the G100 function, and so our system is no longer locking up. I didn't realise this was possible. I am away from home, so cant see what the display says, but I can tell from the App that it is now working OK.

We are still planning to replace the wireless bridge with a direct wired meter connection, since I have already got the cable installed. Just waiting for the installers to agree a date.

I'm not sure what the inverter does now, if it "loses" the meter. I would hope/ expect that it stops discharging the battery, but continues to feed panel power to the grid/ house (as our old non-battery, non-CT, system did).

Duncan

hmmm... the installer is coming out tomorrow....not really sure why but probably to justify their huge profit
will ask about that

Installer came out today and checked the data cabling between the Chint meter in the gateway and the inverter plug When he unplugged the data cable the G100 state 3 error immediately appeared suggesting, as Fox tech already had that it could be a bad connection.........except that with my 40+ years in datacomms cabling that was the first thing I checked and proved it to be good end to end
He then spoke to Fox technical.....apparently they have seen this recently on a handful of inverters and said there is "something that is looking for a parameter that doesnt exist", adding that we arent using G100 so that shouldnt be enabled anyway (!!)..... so they have turned off all messages relating to G100

Maybe they had a batch that were programmed wrongly, who knows.....maybe we never will but IF thats cured the problem I will be happy

Advice is to monitor it for a while to see.....which I will

Added to this..... we have a G99 / 5kWh export limit and I have noted on occasion that we were exporting 5.2. 5.8 and up to 6.4kWh due, it seems to the inverter being set to maximum export by the installer (or more likely not set at all).... I have reduced this to 5kWh and am wondering if that was the cause of the G100 error as G100 relates directly to export limits!

I have since learned that G100 in fact applies standards to the export limits......and after Fox disabled messages about G100 I noted that we are now on unlimited export (I have again seen up to 6.4kWh) rather than the permitted 5kWh of our G99 DNO permit.....does it matter....does anyone care....will they find out and if so what happens ?

Duncanm wrote: ↑Wed Feb 11, 2026 10:35 pm Posting this a bit later, in case it helps someone with the same issue.

Our relatively new Hybrid inverter and battery installation got stuck with a G100 State 3 message (inhibiting battery discharge).
A power reboot did not clear this.

I found that there is a G100 sub menu under settings > on-line which included a reset option. On selecting this it changed from G100 state 3 to G100 state 1, and the Inverter home display then said "normal", and the battery discharge resumed.
Hope this is of help.

No clue why it went into state 3 in the first place.

Duncan

Thanks Duncan,

I had the same problem on a new system which had worked perfectly for 4 weeks. I tried hard reboots, set up forced discharge in the event scheduler and several of the other suggestions in this thread with no success.

I couldn't find the same menu as you described but with a bit of searching i got to

Settings>0000>On-Grid>G100 Para>Reset

Doing the reset did the trick, display on the inverter went from "G100 State 3" to "Normal" and battery discharged as it should.

In case it helps others this was on the following inverter.

H1-3.7E-G2-WL

probably high voltage lock-out...I had this and Fox tch found that G100 should not even be enabled
I also complained to our DNO about consistently high (up to 265V !!!!!) voltages and they have just replaced a 33kV to 230V transformer