FoxESS Community - Owners & Installers Forum

I have a new setup, with a schedule setup to force discharge from 4pm to 9pm (this when I get maximum Feed in Tariff) with the following settings,

Time 16:00 - 21:00
Work Mode Force Discharge
Min SOC on grid 10
Max. SOC 100
Forced discharge cutoff SOC (FDSOC) 30
MAX. AC power for forced discharge (FDPwr) 10000

When I have a cloudy day and no PV production after 4pm my system will discharge to grid and reach the FDSOC of 30% before 9pm, usually around ~ 8.30pm then the system will draw from the grid for 30min up to 9pm and not the battery, after which it will draw from the battery for the rest of the night. On days that I have PV after 4pm it does not become an issue.

So my question is does the schedule (time period) take priority, other than reducing the time period is there a way to make the system draw from the battery when the FDSOC reaches the 30% regardless of the time setting?

Inverter KH9.9
Battery EQ4800

Not sure of your level of technical ability but I've written a python script that will take care of that for me, except it also downloads solar and weather forecasts to try and predict battery charge/discharge/self usage at different times of the day to get the most benefit.

viewtopic.php?t=2855

Also if you're on the same plan as me, 4pm to 9pm is 6c/kWh, but jumps to 15c/kWh for the first 10kWh between 6pm and 8pm.

I'm not sure letting your battery discharging to 10% is the best strategy either, since then you probably have to buy power from the grid at a lot more than you get exporting it.

Thanks for replying, to be clear I have the grid cut off at 30% so I have enough reserve to cover the night and the next morning, until either the PV starts to charge or the 11am free power kicks in to charge the battery. (Glowbird Zero Hero Plan)

I will take a look at you script.

cheers

Magoo wrote: ↑Sat Feb 28, 2026 10:00 am I have the grid cut off at 30% so I have enough reserve to cover the night and the next morning, until either the PV starts to charge or the 11am free power kicks in to charge the battery. (Glowbird Zero Hero Plan)

I missed that bit, I have the same limit and it's mostly working ok except for some reason the air fryer isn't being handled well and the inverter/battery one minute is exporting at 500W+ and the next power is being imported and the smart meter separates the two, but the Fox ESS API seems to combine them.

I'm yet to get a $1/day discount since switching Thursday. Yesterday we imported 300Wh for the 2 hours which is 5x the limit because the inverter/battery doesn't seem to react quickly enough to changing demand and I have no idea what can be done about it.

I'm not sure if other appliances also do the same but very annoying, and costly!