FoxESS Community - Owners & Installers Forum

Morning all,

Over the 4-5 months my system has been installed, I'm pleased to say it's been working well, providing far more energy than we use. I have however noticed some odd numbers that I cannot reconcile. Every day that we've fully charged the battery, the battery always shows as exporting far more energy than it imports, for example, all this week the battery has been at about 80% at midnight, it then drops to about 60% over night then recharges to 100% in the morning, sits there at 100% until about 9pm the drops to 80% again by midnight. Each day however the "battery charge today (solar)" value is roughly 4kWh (makes sense as it's a 10kWh battery charging 40%) but the "battery discharge today (solar)" is around 8kWh. Typically discharge is 1.4 to 2 times greater than battery charge. Assuming it's not a magic battery producing power on it's own, can anybody explain this difference? All numbers are through Home Assistant, if that makes any difference.

Many thanks,

Phil

I wonder if this might be SoC calibration.

How often do you typically cycle through the entire SoC range (i.e., 10% to 100% and back again?)

Does the battery SoC trace look normal? (No vertical jumps or drops?)

What do the 'total' figures look like? (So rather than the charging and discharging from midnight, the total charging and discharging since the system was commissioned?)