FoxESS Community - Owners & Installers Forum

Hello,

I’ve recently had a system installed and have just been moved onto the Octopus Flux tariff. We have been using the mode scheduler for a while to test things out for the last 3 weeks since installation and all has been working fine since the installer helped us update our firmware.

Last night we enabled the schedule to charge at the cheap rate between 2am-4:59am. However, this morning we can see it did not charge. I’ve checked the error logs and there’s nothing in there, firmware looks fine and mode scheduler says enabled. We even did a small test this morning to charge for 40 minutes via mode scheduler, again worked fine. After the charge test worked I deleted the 2am-4:49am schedule and set it up again.

Any ideas?

I’ve attached screenshots of my system and settings.

Was anything else charging, taking power at 2am - EV, water heater, heat pump etc.. ?

Yes, we have a tiny 2 seater hot tub which sits in eco mode overnight, so that always runs a small background amount.

I’m not sure what difference that makes as we’ve charged overnight as a test previously and it worked. We still had the battery discharging at 75% in the morning around 7am.

We’ve logged onto the Fox website and checked the usage graph and can see no attempts by the battery to charge and barely and usage.

Ok, assuming your scheduler was enabled? it should have force charged, a hot tub wouldn’t be enough to do it.

As you said it charged this morning when you tried to- worth deleting all the schedules, re-create them and make sure the Quick Settings screen shows Mode Scheduler as ‘Enable’ then see what happens tomorrow morning.

But if firmware has been recently updated it is worth checking that some settings have not been reset that limit the grid import power - The settings to check (assuming you are comfortable doing so) you have to do at the inverter panel, go into Settings (password is 0,0,0,0) the go to On-Grid, Export Control and check the values in ImportLimitPwr which should be at least 6000 (if higher leave it set, but if lower change it to 6000), then check that ImportLimitCur is set to 100A. (Or contact your installer they can check these remotely).

Thanks, I’ve checked the inverter settings and the only thing is ImporimitCur was set to 0.28.7A. I’ve changed this to 100.0A now.
We’ve also deleted everything in mode scheduler and setup again. It was definitely enabled yesterday and we’ve double checked in the app and on the website.

I’ve just checked the Fox manual. Is it actually safe to set the import limit to 100.0A?

The manual says my inverter models max input is 54.5A

H1-6.0-E-G2:
Max. output current is 27.3A
Max AC input current is 54.5A.

Yes it is safe to set it to that, your inverter is only capable of generating it’s maximum output (or input), this setting controls the entire house load - so for example if you were charging a car, heating the water and trying to charge your home battery the inverter could see as high as 15kwH (66 Amps).

This setting should only be reduced when you have grid import restrictions as they often do in Europe and occasionally in the UK when only a 60A fuse is fitted.

Thanks, we are in the UK and that’s the setting the installer set it to. Do you still think it’s ok to increase?

The battery can also block charge if too cold, you have the EP11, do you have the heated version?

I did see you have the very latest 1.009 firmware on it, so that's good also.

Yep it’s heated and it’s also in a well insulated integral garage that’s used as a gym. Don’t drop below 10 degrees Celsius in there in winter.

Kipplekat wrote: ↑Fri Nov 28, 2025 12:03 pm Thanks, we are in the UK and that’s the setting the installer set it to. Do you still think it’s ok to increase?

Yes, the default is 100A (out of the box) - ideally it should be set to the same value as your main incoming fuse where your smart meter is, typical domestic is 80 or 100A

If you don't have any high loads such as an EV (~7.2kW) or water heater (3kW) or heat pump (6kW) it probably won't make any difference but the way it is set if you had the cooker and hobs on (say for xmas dinner), that would take 7kW (30A) in which case your inverter wouldn't be able to charge your batteries at the same time (not that you would be, but it should be set correctly).

Thank you. I’ll set it to 100.0A for today to test overnight and see what happens. I’ve also deleted the old schedules and set them up again so will see if that helps.

The battery failed to charge overnight again. If we schedule a charge now it works with no issues, any other time of day or night before we go to bed is fine. Any ideas or way I can contact support?

We checked the usage graphs and we had no usage spikes between 2-5am, nothing was drawing any power other than phantom load.

email: service.uk@fox-ess.com

Thank you, I’ve raised a support ticket

Just bumping this post in case anyone can help quicker than the support team. I couldn’t get through on the phone and I’m waiting on their email support which says two business days, which is really rubbish when we want our system up and running properly.

Last night I got up at 2am to see what was actually happening with the charging. I checked the battery and it was in standby mode, not charging. The schedule was set correctly, I enabled and re-enabled it a couple of times and adjusted the time to 02:15, waited and suddenly it started charging. Obviously this proves it will charge overnight, but why it won’t automatically do it without fiddling with the on/off toggle I don’t know. We’ve also setup a brand new schedule on the web rather than using the app. All through the day it will charge at the test intervals we set. Goes past midnight and can’t seem to work out it has anything scheduled.

Is this likely a firmware issue?

My only quick suggestion while you wait, would be to erase all schedules.
Wait 5 mins, verify they are gone.

Power down system fully, and wait at least 30 secs after the inverter screen has gone blank.
Power it all up, make sure it passes all the self tests.

Verify date/time is correct on screen.

Program in your charge schedule (or a test one starting in next few mins)

Check results/program in the normal charge cycle.

I’ve done this and we have the same result. I’m waiting on my installer to push any firmware updates out.

If you raised the ticket with Fox on Saturday, you should get a reply at some point later today or tomorrow.
Unless your installer makes contact, but suspect the time range will be the same.

What does your scheduler look like now?

If you only have a single charge entry, and no fancy discharge or mode swaps going on, you could cancel this and use the basic Grid Charge Setting perhaps?

We currently have cheap electric on a Sunday afternoon so we enable that on a Sunday in the schedule, we setup a discharge slot for peak export rate (I’ve switched it off at the moment as we don’t have anything to discharge) then there’s the cheap night rate slot.

I’ve recreated these on the web rather than in the app. I’ve considered using the force charge slots instead until we can get it working.

Understood, well you can try to disable the scheduler fow now, and use Grid Mode for the next early morning charge window. At least for now it will give you some power if it works to use in the house.

I do suspect Fox Support will email you fairly quickly and get the firmware updates done (keep checking spam folder, as mine went there)

It is frustrating, but you should be sorted soon.
I hope the next charge works as intended.

Thank you, yes I think we should hopefully get it sorted soon. It has been a process of elimination!