Installed Battery Capacity wrong value

[goldserve]

If shunt is present, installed battery capacity should not be Shunt capacity + BMS capacity because that is assuming you enter the overall total capacity in the shunt config. If a BMS goes offline, maybe you can minus the capacity but not add.

[Sleeper85]

Shunt capacity is not a parameter used in YamBMS. Only these information are used: Voltage, Current, Power and SoC.

https://github.com/Sleeper85/esphome-yambms/blob/main/documents/README/YamBMS_behavior.md#shunt

[goldserve]

I am confused where the 850Ah comes from when the only one BMS is reporting 270Ah then...

[Sleeper85]

The Installed Battery Capacity value is the sum of the Ah of all your battery packs. At ESP32 startup this value is 0, this value increases when a BMS is combined for the first time (only the first time) and it will never decrease after that (except after reboot).

In the example below, 3x 280Ah batteries have been combined, then a BMS fails or you uncombine a BMS. The Installed Battery Capacity value remains unchanged but the Battery Capacity value is decreased by 280Ah.

Capacity Remaining represents the Ah remaining in Battery Capacity.

[goldserve]

I'm trying to track this down in code because I only have 1 BMS...Is it possible HA restored an old value and just kept on incrementing this because I switched ESPHome hardware but kept the same entities?

[Sleeper85]

I'm trying to track this down in code because I only have 1 BMS...Is it possible HA restored an old value and just kept on incrementing this because I switched ESPHome hardware but kept the same entities?

It is possible, you can completely delete your ESP32 in HA as well as all entities and then add it again.

bms_combine.yaml

            // Combine once only
            if (id(bms${bms_id}_combined_once) == false)
            {
              id(${yambms_id}_total_installed_battery_capacity) += id(bms${bms_id}_battery_capacity).state;
              id(bms${bms_id}_combined_once) = true;
            }

[goldserve]

Not related to code but probably my Home Assistant. I saw the variable increment from 580 + 270 but i don't remember how I entered that 580 to begin with.

[Sleeper85]

@goldserve

Can you please check the message I sent you on the DIY Solar forum.

Thanks