RCT Power Battery provides no "capacity info" (in evcc mqtt) - wrong total SOC

Describe the bug

Situation:

I have two battery systems:

Battery 1 -> RCT Power -> configured by Template
Battery 2 -> custom configured

Due to the fact that the RCT Power Battery reports no "Capacity" defined (see mqtt outut) the calculated SOC on evcc screen (derived from Battery 1 -> RCT Power (4 Packs means 6.9 kWh/90%) and Battery 2 -> Capacity 3.7 kWh/90%) will show the wrong value, because you must use the weighted capacity of each battery. You cannot calculate the total SOC using the only the single SOCs of both batteries.

Is it a bug that RCT Power Power provides no Capacity value and so the total SOC cannot be calculated at the end?

evcc shows 25% SOC of all batteries

Calculation should be:

Battery1: 9,3% SOC 6.9 kWh = 0,642 kWh Battery 2: 23% SOC 3,7kWh = 0,851 kWh

SOC total (to be displayed in evcc) = (0,642 kWh + 0,851 kWh) / (6.9 kWh + 3,7kWh) = 1,493 / 10,6 = 14,1%

Steps to reproduce

see description above
...

Configuration details

meters:
  - name: my_rct_grid
    type: template
    template: rct-power
    usage: grid
    host: 192.168.178.xx
  - name: my_rct_pv
    type: template
    template: rct-power
    usage: pv
    host: 192.168.178.xx
  - name: my_rct_battery
    type: template
    template: rct-power
    usage: battery
    host: 192.168.178.xx
...
  - name: my_bluetti_battery
    type: custom
    power: # power (W)
      source: mqtt # plugin type
      topic: bluetti/state/AC200M-2236008116154/dc_output_power
      timeout: 15s # don't accept values older than timeout
      # scale: 0.001 # floating point factor applied to result, e.g. for Wh to kWh conversion
      scale: 0.9 # negativ "charging"; positiv "discharging" - 90% efficiency after inverter
    soc: # optional battery soc (%)
      source: mqtt # plugin type
      topic: bluetti/state/AC200M-2236008116154/total_battery_percent
      timeout: 15s # don't accept values older than timeout
    capacity: 3.7

Log details

[site  ] DEBUG 2023/02/24 09:43:53 battery 1 power: -630W
[site  ] DEBUG 2023/02/24 09:43:53 battery 1 soc: 10%
[site  ] DEBUG 2023/02/24 09:43:53 battery 2 power: 0W
[site  ] DEBUG 2023/02/24 09:43:53 battery 2 soc: 23%
[site  ] DEBUG 2023/02/24 09:43:53 battery soc: 26%
[site  ] DEBUG 2023/02/24 09:43:53 battery power: -630W
[site  ] DEBUG 2023/02/24 09:43:53 grid power: 4W

What type of operating system are you running?

Linux -> Home Assistant hassio (docker!?)

Version

0.112.5 No response

evcc-io / evcc