Option to schedule charging disappeared

[rolotwix12]

Sorry do you mean change under work mode. It’s currently on mode scheduler

[MaterialBarracuda48]

Hi

I have mode scheduler set up to force charge

Alan

To be fair Alan, you might be bang on the money. I don't use the mode schduler anymore as I have Home Assistant to perform the tasks. There are some Firmware bugs that do block people, but it can also manifest if you have a schedule active and it's not liking the input.

There was a recent bug where the values were reversed MinSoc and MaxSoc being back to front*

*I cannot recall exactly, but there was a back to front bug for some value that caused the blocking behavior or unexpected behavior in the systems for a while.

[AlanHodson]

Sorry do you mean change under work mode. It’s currently on mode scheduler

Hi Rolotwix,
I'm a little confused, the earlier attachment showed you were in quick settings trying to adjust your System Max SOC
But the latest attachment shows you back in work mode.
If you want to change the system max soc you need to be in quick settings.
But as Barracuda mentioned some people have issues

[AlanHodson]

Hi

I have mode scheduler set up to force charge

Alan

To be fair Alan, you might be bang on the money. I don't use the mode schduler anymore as I have Home Assistant to perform the tasks. There are some Firmware bugs that do block people, but it can also manifest if you have a schedule active and it's not liking the input.

There was a recent bug where the values were reversed MinSoc and MaxSoc being back to front*

*I cannot recall exactly, but there was a back to front bug for some value that caused the blocking behavior or unexpected behavior in the systems for a while.

Hi Barracuda,
I think the fox cloud 2 app is poor, the cloud 1 was far easier for basic settings.
With Fox 2 you can't even set a force charge through midnight, you have to set one up to 23 59 the next from 00 00.

[MaterialBarracuda48]

Hi

I have mode scheduler set up to force charge

Alan

To be fair Alan, you might be bang on the money. I don't use the mode schduler anymore as I have Home Assistant to perform the tasks. There are some Firmware bugs that do block people, but it can also manifest if you have a schedule active and it's not liking the input.

There was a recent bug where the values were reversed MinSoc and MaxSoc being back to front*

*I cannot recall exactly, but there was a back to front bug for some value that caused the blocking behavior or unexpected behavior in the systems for a while.

Hi Barracuda,
I think the fox cloud 2 app is poor, the cloud 1 was far easier for basic settings.
With Fox 2 you can't even set a force charge through midnight, you have to set one up to 23 59 the next from 00 00.

Hi Alan,

I was going some thinking about the FoxCloud2.0 App, and I think it was a bug in the v2.2.0 or v2.2.1 where things were reversed, I think the v2.2.2 doesn't have this swap around bug.

You are spot on about the Desktop site v1 being the gold standard, it has existed for a long time and has been stable.
The Desktop site v2 looks very polished, but there are issues of course, along with different Firmware versions and some recent changes in the back-end database that are creating chaos for sure.

The recent raft of Firmware updates that break settings and expected functionality is not helping for sure.

2026 is off to a rocky start for Fox, but I am still happy with my choice of hardware, and I am hoping in the coming months they iron out the bugs.

[AlanHodson]

To be fair Alan, you might be bang on the money. I don't use the mode schduler anymore as I have Home Assistant to perform the tasks. There are some Firmware bugs that do block people, but it can also manifest if you have a schedule active and it's not liking the input.

There was a recent bug where the values were reversed MinSoc and MaxSoc being back to front*

*I cannot recall exactly, but there was a back to front bug for some value that caused the blocking behavior or unexpected behavior in the systems for a while.

Hi Barracuda,
I think the fox cloud 2 app is poor, the cloud 1 was far easier for basic settings.
With Fox 2 you can't even set a force charge through midnight, you have to set one up to 23 59 the next from 00 00.

Hi Alan,

I was going some thinking about the FoxCloud2.0 App, and I think it was a bug in the v2.2.0 or v2.2.1 where things were reversed, I think the v2.2.2 doesn't have this swap around bug.

You are spot on about the Desktop site v1 being the gold standard, it has existed for a long time and has been stable.
The Desktop site v2 looks very polished, but there are issues of course, along with different Firmware versions and some recent changes in the back-end database that are creating chaos for sure.

The recent raft of Firmware updates that break settings and expected functionality is not helping for sure.

2026 is off to a rocky start for Fox, but I am still happy with my choice of hardware, and I am hoping in the coming months they iron out the bugs.

I agree with your thoughts

[evilbunny]

It will degrade the cells, so shortening their life expectancy.

While waiting for my appointment earlier I was flicking through links posted to this forum, including this one on calendar degradation of LFPs.

https://www.sciencedirect.com/science/a ... 1722000283

It's a paper on heat and cell degradation, and you were right that heat can cause capacity to fade, but heat alone is too simplistic.

"For example, high charging rates or high temperatures on their own do not always result in a shorter cycle life. A combination of 1C discharging and 3.75C charging degraded the tested cells more rapidly than a symmetric cycle with 3.75 ​C-rate in both charging and discharging"

They also found that cells degrade more as the SoC increases.

So fully charged batteries during summer may be a bad idea, and it can have a knock on effect in winter "When LFP cells were calendar degraded, especially at elevated temperatures, they behaved very poorly in low-temperature cycling"

It also recommends fully charging and discharging periodically as it can recover capacity.

Unfortunately it doesn't put all the pieces together in a neat summary on how best to look after LFPs year round.

[evilbunny]

Claude (AI bot) wrote a better summary than my attempt above.

Based on the paper, here are the key takeaways for maximising LFP longevity:

State of Charge (SOC)

Avoid keeping them at 100% SOC for extended periods, especially in warm weather — high SOC accelerates SEI growth and iron dissolution
Medium SOC range (around 50%) is best for storage/calendar life
Avoid very low SOC too — both extremes increase impedance

Temperature

The biggest factor in calendar degradation is high temperature combined with high SOC — avoid both together
Don't charge at low temperatures (0°C or below) — causes lithium plating on the graphite anode which is a significant degradation mechanism
Cycling at 45°C causes roughly 4x more capacity loss than at room temperature

Charge/Discharge Rates

Keep charge rates below 2C where possible — above 2C lithium plating becomes the dominant degradation mechanism
The paper's interesting finding: symmetric high C-rate (3.75C both ways) degraded less than asymmetric 1C discharge / 3.75C charge — so matched charge/discharge rates matter
Constant current charging degrades cells more slowly than constant current-constant voltage (CC-CV)

Depth of Discharge (DOD)

Shallow cycling is gentler — 200 cycles at 90% DOD is harder than 2000 cycles at 10% DOD
However shallow cycling can cause SOC inhomogeneity inside the cell — occasional full cycles help redistribute lithium

Practical summary for a home battery:

Daily charge target around 80-90%, not 100%
Keep minimum around 20-30%
Avoid charging when very cold
Keep the battery cool if possible — shade, ventilation

Since I had no clue about CC verses CC-CV

Constant Current (CC) — the charger pushes a fixed current the whole time until it hits the voltage limit, then stops. Simpler, slightly less complete charge.

Constant Current - Constant Voltage (CC-CV) — the charger pushes a fixed current until it hits the voltage limit, then holds that voltage while the current tapers down to near zero. This top-up phase squeezes in the last few percent of charge but holds the cell at peak voltage for an extended period.

The paper is saying that the CV phase is the damaging part — sitting at peak voltage while the current tapers accelerates SEI formation and iron dissolution, even though it gives you a more complete charge.

Practical implication for your home battery:

Most hybrid inverters charge to a set voltage and then do a CV top-up phase. If your FoxESS lets you set a max SOC (say 90% instead of 100%), you're effectively skipping or shortening that CV phase, which is better for longevity — which aligns with the advice to not charge to 100% daily.

And it must have scraped this forum during training

Based on the FoxESS community forums, here's what's actually happening:

The 0% and 100% you see are the true cell limits — unlike some manufacturers, FoxESS doesn't appear to hide a significant buffer inside those numbers. The kWh remaining figure shows everything the battery has remaining including the 10% minSoC — you just can't access anything below 10% as the BMS cuts power, so actual usable capacity is 90% of the rated capacity with a 10% minSoC setting.

So the buffer is the minSoC setting itself (10% by default), not a hidden internal buffer on top of that.

The batteries are warranted at 90% depth of discharge, so FoxESS's own recommendation is to use the full range from 100% down to 10% minSoC.

One important caveat: batteries are rated at 100% capacity at 25°C ambient and will fall to approximately 85% of that at 0°C.

So in summary — what you see is what you get, the 10% minSoC is the buffer, and FoxESS warranties are based on that 90% DoD range.

And

C-rate is a measure of how fast a battery is charged or discharged relative to its capacity.
1C means charging or discharging the full capacity in 1 hour. So for a 100Ah battery:

1C = 100A (full charge/discharge in 1 hour)
0.5C = 50A (2 hours)
2C = 200A (30 minutes)

3.75C means charging or discharging at 3.75 times the capacity in 1 hour — so for a 100Ah battery that's 375A, fully charged/discharged in just 16 minutes.
That's an extremely high rate for LiFePo4 — most LiFePo4 cells are rated for:

Continuous discharge: 1C-3C typically
Max charge: 0.5C-1C recommended for longevity
Absolute max charge: 1C-2C for most cells

[AlanHodson]

Claude (AI bot) wrote a better summary than my attempt above.

Based on the paper, here are the key takeaways for maximising LFP longevity:

State of Charge (SOC)

Avoid keeping them at 100% SOC for extended periods, especially in warm weather — high SOC accelerates SEI growth and iron dissolution
Medium SOC range (around 50%) is best for storage/calendar life
Avoid very low SOC too — both extremes increase impedance

Temperature

The biggest factor in calendar degradation is high temperature combined with high SOC — avoid both together
Don't charge at low temperatures (0°C or below) — causes lithium plating on the graphite anode which is a significant degradation mechanism
Cycling at 45°C causes roughly 4x more capacity loss than at room temperature

Charge/Discharge Rates

Keep charge rates below 2C where possible — above 2C lithium plating becomes the dominant degradation mechanism
The paper's interesting finding: symmetric high C-rate (3.75C both ways) degraded less than asymmetric 1C discharge / 3.75C charge — so matched charge/discharge rates matter
Constant current charging degrades cells more slowly than constant current-constant voltage (CC-CV)

Depth of Discharge (DOD)

Shallow cycling is gentler — 200 cycles at 90% DOD is harder than 2000 cycles at 10% DOD
However shallow cycling can cause SOC inhomogeneity inside the cell — occasional full cycles help redistribute lithium

Practical summary for a home battery:

Daily charge target around 80-90%, not 100%
Keep minimum around 20-30%
Avoid charging when very cold
Keep the battery cool if possible — shade, ventilation

Since I had no clue about CC verses CC-CV

Constant Current (CC) — the charger pushes a fixed current the whole time until it hits the voltage limit, then stops. Simpler, slightly less complete charge.

Constant Current - Constant Voltage (CC-CV) — the charger pushes a fixed current until it hits the voltage limit, then holds that voltage while the current tapers down to near zero. This top-up phase squeezes in the last few percent of charge but holds the cell at peak voltage for an extended period.

The paper is saying that the CV phase is the damaging part — sitting at peak voltage while the current tapers accelerates SEI formation and iron dissolution, even though it gives you a more complete charge.

Practical implication for your home battery:

Most hybrid inverters charge to a set voltage and then do a CV top-up phase. If your FoxESS lets you set a max SOC (say 90% instead of 100%), you're effectively skipping or shortening that CV phase, which is better for longevity — which aligns with the advice to not charge to 100% daily.

And it must have scraped this forum during training

Based on the FoxESS community forums, here's what's actually happening:

The 0% and 100% you see are the true cell limits — unlike some manufacturers, FoxESS doesn't appear to hide a significant buffer inside those numbers. The kWh remaining figure shows everything the battery has remaining including the 10% minSoC — you just can't access anything below 10% as the BMS cuts power, so actual usable capacity is 90% of the rated capacity with a 10% minSoC setting.

So the buffer is the minSoC setting itself (10% by default), not a hidden internal buffer on top of that.

The batteries are warranted at 90% depth of discharge, so FoxESS's own recommendation is to use the full range from 100% down to 10% minSoC.

One important caveat: batteries are rated at 100% capacity at 25°C ambient and will fall to approximately 85% of that at 0°C.

So in summary — what you see is what you get, the 10% minSoC is the buffer, and FoxESS warranties are based on that 90% DoD range.

And

C-rate is a measure of how fast a battery is charged or discharged relative to its capacity.
1C means charging or discharging the full capacity in 1 hour. So for a 100Ah battery:

1C = 100A (full charge/discharge in 1 hour)
0.5C = 50A (2 hours)
2C = 200A (30 minutes)

3.75C means charging or discharging at 3.75 times the capacity in 1 hour — so for a 100Ah battery that's 375A, fully charged/discharged in just 16 minutes.
That's an extremely high rate for LiFePo4 — most LiFePo4 cells are rated for:

Continuous discharge: 1C-3C typically
Max charge: 0.5C-1C recommended for longevity
Absolute max charge: 1C-2C for most cells

After this information I changed my max soc to 90 no problem but
Tried setting the main soc to 20 and got an error code
This is just one of the issues that fox cloud 2 app users are coming across.
I've contacted fox help on quite a few of them
service.uk@myfoxess.zohodesk.eu

[evilbunny]

After this information I changed my max soc to 90 no problem but
Tried setting the main soc to 20 and got an error code
This is just one of the issues that fox cloud 2 app users are coming across.
I've contacted fox help on quite a few of them
service.uk@myfoxess.zohodesk.eu

If you have schedules enabled you need to adjust the min/max in the schedules otherwise you get that error. If you disable schedule mode you'll be able to update those settings but they don't effect schedules at all.

Not sure about UK support, but I had all sorts of a problem getting AU support on the phone, although I lucked out this week and got someone on the first call 2 days in a row.

The AU email address just replies saying to submit a ticket which I did but it was never looked at as far as I know, and is still listed as open even after I added a comment saying phone support fixed it.

[AlanHodson]

After this information I changed my max soc to 90 no problem but
Tried setting the main soc to 20 and got an error code
This is just one of the issues that fox cloud 2 app users are coming across.
I've contacted fox help on quite a few of them
service.uk@myfoxess.zohodesk.eu

If you have schedules enabled you need to adjust the min/max in the schedules otherwise you get that error. If you disable schedule mode you'll be able to update those settings but they don't effect schedules at all.

Not sure about UK support, but I had all sorts of a problem getting AU support on the phone, although I lucked out this week and got someone on the first call 2 days in a row.

The AU email address just replies saying to submit a ticket which I did but it was never looked at as far as I know, and is still listed as open even after I added a comment saying phone support fixed it.

Thanks evil bunny,
It's a bit hypocritical that you go into what they call "Quick Settings" and you need to go through all that just to reset a % value.

If we try to contact the "contacts" on the app we have the same issues of no replies just ticket numbers

[evilbunny]

It's a bit hypocritical that you go into what they call "Quick Settings" and you need to go through all that just to reset a % value.

Since I haven't had a battery long I'd say they added new features in the past and those settings are now redundant.

Bit like the default currency setting, that as best I can tell doesn't do anything but confuse owners.

To actually set the currency you have to go into the tariff section and set/update it there.

The only ones that would benefit from that is if installers/companies have systems in different places with different currencies, as I said just confuses owners.

[MaterialBarracuda48]

I have been a little busy this morning with tasks, so not had time to reply properly.

For anyone following this thread, regarding charge/discharge rates and battery health.
The BMS inside the battery controls the charge and discharge rates, and it takes into consideration several factors when choosing the charge and discharge rates. The article mentioned and the following AI fluff does not add value to the discussion.

The cells don't charge at some extreme rate so as to damage them, it drops down to protect the cells when cold, and when extremely hot also.


It's an old video, but seems it is worth a watch again.

[evilbunny]

The BMS inside the battery controls the charge and discharge rates, and it takes into consideration several factors when choosing the charge and discharge rates. The article mentioned and the following AI fluff does not add value to the discussion.

What'd it get wrong?

The cells don't charge at some extreme rate so as to damage them, it drops down to protect the cells when cold, and when extremely hot also.

Actually that was what the researchers found, check out the link I posted above to their actual paper, the bot only summarised what they wrote.

The point about the extreme charging/discharging rate was researchers found symmetry mattered more than the actual rate. It's a research paper, they were testing limits to see what would break.

That said my itty bitty 5kW inverter will only do 0.12C so I don't think I'll break any records any time soon.

It's an old video, but seems it is worth a watch again.

Why would that be a more authoritative source?

Since the paper was published it's been cited by 196 other papers, wouldn't significant flaws in their research have led to a retraction by now?