FoxESS Community - Owners & Installers Forum

HI, new user here from Australia. I have a EV and electricity plan that allows me to use free electricity between 11am and 14pm.

Yesterday was my first day and i managed to force the battery to charge in these 3 hours using the "Grid Charge Setting".

Today during same hours the battery started charging, but then i also plug in the EV and the battery started to discharge.
- at 11 am battery started charging as expected - it was in self mode with - Grid charge setting
- 11:25 i plugged in the EV and started more heaters int he house - and noticed the battery started to discharge - but only lite - as in still drawing 11kW from grid and only about 2 - 3 kW from battery
- 11:41 i think i changed the mode to Backup and everything worked as expected, the ev was charging and also the battery was chargiong .. .but soon after, the battery started discharging by itself
- 12:21 i discovered Mode scheduler in app, and enabled that with mode "Force Charging" - it did exactly the opposite, it started discharging with close to 10kW - that is the size of my inverter
- i switched back to "Backup" mode, and this time the battery did not discharge any more, at all, but also did not charge
- 13:54 i gave Mode Scheduler - Force Charge another try - but same result, the battery started to discharge 10kW

i suspect it may be something with the settings that i have on the "Mode Scheduler" . I hope it is about settings since for a brief moment it did work and was doing what i need - charge both battery and EV and run heating etc in the house, all from grid.

Can i get some recommendations in these settings?
Like what is "Min SOC on Grid?" - if i want to force charge should this be 100%?
What is Max SOC ? should this be 100 % ?
Forced discharge cutoff SOC ? maybe 100% ?
MAX AC power ? what should be here ?

Thank you , and have a good day!

Your problem there is maxSoC should be 100% but i’ll run through them as the very latest firmware uses FDSoC and FDPwr as well for charging.

MinSoC is the absolute minimum you can discharge the batteries before they will cut power and maintain themselves - you can’t set this via the scheduler.

MinSoC on Grid (aka Battery Reserve) is normally left the same as minSoC unless you have the EPS system wired up and want to ‘reserve’ power should the grid fail - usually set it the same as minSoC.

MaxSoC is the amount you want the battery to charge from grid before it returns to Self Use mode - this should be 100%, as you have set it to 10% it’s basically not force charging at all just staying in self use mode. This only affects charge from grid, solar power will always be used to charge the batteries to 100% when in self use mode.

FDPwr (Max AC power for Forced Discharge) - this is the power in watts you want the batteries to discharge at i.e. this is forced export less any house load. On the latest firmware it now also is used to specify how much charge power you want to use - earlier versions didn’t care whether it was zero or 6000 but get used to setting it so for example 4000 is 4kW charge power.

FDSoC (Force Discharge Cutoff SoC) - when force discharging you may want to stop the force discharge when you reach (say 50%) battery soc, so set this when force discharging to what you want left in the battery after a force discharge has finished. The latest firmware seems to use this like MaxSoC (not sure if this is a bug or a feature yet) but for now get used to setting this to the same value as you have set MaxSoC i.e. if MaxSoC is 100% so should this be when force charging.

Thank you very much for taking time to explain this to me. I updated the settings, hardly wait for tomorrow to try out