FoxESS Community - Owners & Installers Forum

Hi all.
I'm not sure if this is a battery thing or something to do with the data that is coming into HA. When my battery hits its minimum SOC or when I've set it to a specific one, it seems to seesaw up and down. I've shown this in the attached image. Is this normal?
Thanks

How have you set you inverter during that period, is it charging with a force charge and you have maxsoc set, or have you changed minsoc so that it slow charges?

In the first instance, mode was set to self use and it hit my minimum SOC of 20%. The second bit was after off-peak kicked in and I raised the minimum SOC to 60%, keeping work mode as self use. You can see it rise to 60% and then holds there but does that seesaw motion.
Maximum was at 90% the entire time

Ok thanks, it's not unexpected behaviour, smaller inverters don't do it quite as much and it also depends on your battery storage size - from my observations a KH 10.5 appears to overshoot minSoC between 2 & 5%

Essentially when minSoC is higher than SoC, it allows charge at a fixed 5A (DC so multiply by battery volts to get power in watts) until the SoC raises above minSoC at which point it will stop charging so you see the overshoot. The battery is used to power the inverter, BMS etc.. (even on grid) and so it gradually falls back again until SoC is at minSoC at which point it will repeat the cycle all over again.

OK, that makes sense.
Thanks