FoxESS Community - Owners & Installers Forum

I've recently had an H-6.0-E-G2 installed and two EP11 batteries. I'm trying to understand what some of the charging related sensors in HASS are actually referring to.

I'm on intelligent octopus go, so I'm charging between 23:30 and 05:30.

Last night my batteries were charging at ~3kW (I figure setting it as slow as possible is better for them and (0.9*10.36*2)/6 = 3.1kW so I'll be setting this to 3.5kW going forward) but the "Inverter Battery Current" sensor was showing "-7.2A" while the "BMS Charge Rate" sensor was showing "29A". Which of these is actually related to the figures on the EP11 datasheet? I can see on there they're showing a max discharge/charge rate of 27A and a recommended rate of 13.5A

Just trying to work out if I'm confusing myself here...

The BMS Charge Rate sensor is the BMS telling the inverter what the maximum allowable charge rate is, it calculates this based on SoC and temperature - and it will reduce this figure as it approaches 90% or the temp drops below 20C. This is the absolute maximum it can charge at, but obviously you can charge with a lower current if needed.

The inverter battery current is showing your charging (or discharging with a flipped sign) rate - so if you multiply this by inverter battery volts you will get the power. The EP11 has a voltage range across 10-100% SoC of 348-438V.

Dave Foster wrote: ↑Tue Nov 05, 2024 8:45 am The BMS Charge Rate sensor is the BMS telling the inverter what the maximum allowable charge rate is, it calculates this based on SoC and temperature - and it will reduce this figure as it approaches 90% or the temp drops below 20C. This is the absolute maximum it can charge at, but obviously you can charge with a lower current if needed.

Ahh, that makes much more sense - should probably have picked that up from the "BMS Discharge" sensor always showing 50A. Thanks