I've got the Fox ESS system with H3 inverter installed about a week ago and was experimenting with the configuration.
My power provider has off-peak and peak periods and I would like to avoid drawing power from grid during peak period. My approach was to try to ensure that the battery has a certain SOC percentage just before the peak period starts.
What I found is that it is quite hard to achieve with the Fox Cloud 2.0.
I can use the mode scheduler to configure periods but:
- if I use "self use" period with a minimum SOC set to 50%, it will charge the battery but from solar only, not from grid, which might not be enough on the cloudy day
- if I use "force charge" period, there doesn't seem to be a way to set the limit SOC, it just charges to 100% regardless.
There is a setting called "Forced charge cutoff SOC" when the period mode is "force charge" but I cannot set it to anything but 100% - the app lets me to change it to anything I want and successfully submit, but if I check later it'll be set to 100% again.
What I'm wondering is - is this a known shortcoming? Is this a bug? Is there another way of achieving what I want?
If you set self use with minsoc at 50%, the battery will slow charge (at 5A DC) using solar, and if there isn't enough solar it should take it from grid - depending on your battery voltage 5A won't charge very quickly.vava wrote: ↑Sat Dec 27, 2025 10:21 am
I can use the mode scheduler to configure periods but:
- if I use "self use" period with a minimum SOC set to 50%, it will charge the battery but from solar only, not from grid, which might not be enough on the cloudy day
- if I use "force charge" period, there doesn't seem to be a way to set the limit SOC, it just charges to 100% regardless.
There is a setting called "Forced charge cutoff SOC" when the period mode is "force charge" but I cannot set it to anything but 100% - the app lets me to change it to anything I want and successfully submit, but if I check later it'll be set to 100% again.
What I'm wondering is - is this a known shortcoming? Is this a bug? Is there another way of achieving what I want?
Using Force charge you need to set the maxSoC and FCSoC to be 50%, they are essentially the same thing on latest firmware but if you only set one, it will get overridden by the other.
Will has done a very good video that covers the various methods of charge and discharge, definitely worth a watch
https://youtu.be/L_AC_H4TPsQ?si=rsvQK9jp3r4uWcr-
I've tried that today, doesn't work the way I want it to work unfortunately.
My peak period starts at 3pm, so I've set a "force charge" interval from 14:30 to 14:59.
I've set all of the min SOC, max SOC and Force Charge Max SOC to 30%.
Note though that I've checked later and the Force Charge SOC was overridden to 100%.
Today was a relatively sunny day so the battery was charged from solar to almost 90% before force charge period started.
However, the force charge period still prioritised charging the battery, even though max SOC was set to 30% and the battery was almost full.
It looks like it was using just solar for that purpose but I would've liked it to actually use solar and battery to power the house at this point, rather than trying to get battery to a 100%.
My peak period starts at 3pm, so I've set a "force charge" interval from 14:30 to 14:59.
Note though that I've checked later and the Force Charge SOC was overridden to 100%.
However, the force charge period still prioritised charging the battery, even though max SOC was set to 30% and the battery was almost full.
Hi
Vava: Did you ever manage to resolve this ?
I have the same issue with my kh10 inverter and ep11 batteries. Id like to force charge overnight to say 80%, to leave some room for solar charging the following day whilst ensuring I have enough battery charge.
I set the max soc and force charge to 80%, save it and can conflicts saved ok. However at later point both settings get overwritten to 100%.
It's a bit frustrating, just wondering if anyone knows how to fix this ?
Vava: Did you ever manage to resolve this ?
I have the same issue with my kh10 inverter and ep11 batteries. Id like to force charge overnight to say 80%, to leave some room for solar charging the following day whilst ensuring I have enough battery charge.
I set the max soc and force charge to 80%, save it and can conflicts saved ok. However at later point both settings get overwritten to 100%.
It's a bit frustrating, just wondering if anyone knows how to fix this ?
No, unfortunately I think this is how it works.
If you charging from the grid though you can control how much charge will be added using time - Force Charge will always charge at the maximum speed so you can time it to charge just a certain amount.
Not as nice as being able to say how much charge you'd like it to have at the end still.
If you charging from the grid though you can control how much charge will be added using time - Force Charge will always charge at the maximum speed so you can time it to charge just a certain amount.
Not as nice as being able to say how much charge you'd like it to have at the end still.
Thanks for getting back to me, ok, I guess a blend of timed force charging and slow charging via "self use", with a high soc setting will have to do.
Best regards
Paul
Best regards
Paul