FoxESS Community - Owners & Installers Forum

There seems to be an issue with charging up before sunrise. I have my mode schedule set to charge with the following settings:

Work mode: Force Charge
Min SOC on grid: 10%
Max SOC:12%
Forced discharge cutoff soc (FDSOC): 30%
MAX. AC power for forced discharge (FDPwr): 4000W

The only other entry in my mode scheduler is Forced discharge, min SOC on grid 10%, FDSOC 30%, FDPwr 4000W. This works fine on its own and discharges to 30% as required.
When I introduce the Forced charge, albeit the battery has already reached 10% prior to 4:30am, the system charges up past 12%, reaching 15% on grid before sunrise at which point PV is sufficient to take over charge.
I reset the system in the morning when i wake up (prior to sunrise) to stop the battery from charging and this resolves the problem.
I reset and submit mode scheduler and the battery stops charging from the grid at the point. By mid-day the battery is usually fully charged however for some reason at 3pm the battery starts discharging (currently sitting at 96% as I type) despite PV being sufficient to supply the load. So i have to reset the system again in the afternoon after which the battery charges up to 100% as required.
This problem has happened every day through this week and only happens if I have the charge period enabled in mode scheduler. The discharge works fine on its own.

Does anyone know why this is happening?

Min SOC and battery reserve capacity both set to 10% in my system.

Can you post a picture from your app of your scheduler settings please (particularly the times).

For force charge, FDSoC and FDPwr are not used and are ignored (but they have to be entered as a valid number).

If you could also let me know what inverter model you have, and if you go to the ‘Device’ tab in the app, click on ‘Inverter’ and then click on the serial number below the inverter picture it will give you some settings - can you list your Master and ARM versions.

See attached

You are definitely running old versions of firmware, the schedules were only introduced around these versions and there were quite a few ‘undesirable features’ when released - I think a good starting point would be to get the firmware updated - latest is Master 1.47 and ARM 1.45, your installer should do this for you - but you can raise a support ticket in the app ‘Me’, ‘Contact Us’, ‘Support’ and ask for your inverter firmware to be updated.

Can I ask why you are using maxsoc of 12% in the force charge from grid, that would/should restrict the charge to no more than 12% soc which is only a very small amount above your minsoc (10%)

I only need 2% in the morning from 5am to 7.30am when PV takes over to charge the battery.
2% will increase in winter I'm sure.

Have contacted my installer to upgrade the firmware and will let you know if that fixes the issue.

Ok once you are updated let us know how you get on.