Hi
I am trying to create a sensor that will show the Min, Max and Delta voltages of the cells in my battery modules, and output the cell number for the Min Max
This code works in template editor but not when I add it to my Yaml code, I just get a Null output (no errors)
I have 5 battery modules in total and the goal it to monitor the Min, Max and Delta.
Image of the Result from template editor
Image of the state attributes
![image]()
template:
- sensor:
- name: "Battery Module Cell V Max Min Delta"
state: >-
{% set voltages = [
states('sensor.esp_monitor_cells_voltage_201') | float(0),
states('sensor.esp_monitor_cells_voltage_202') | float(0),
states('sensor.esp_monitor_cells_voltage_203') | float(0),
states('sensor.esp_monitor_cells_voltage_204') | float(0),
states('sensor.esp_monitor_cells_voltage_205') | float(0),
states('sensor.esp_monitor_cells_voltage_206') | float(0),
states('sensor.esp_monitor_cells_voltage_207') | float(0),
states('sensor.esp_monitor_cells_voltage_208') | float(0),
states('sensor.esp_monitor_cells_voltage_209') | float(0),
states('sensor.esp_monitor_cells_voltage_210') | float(0),
states('sensor.esp_monitor_cells_voltage_211') | float(0),
states('sensor.esp_monitor_cells_voltage_212') | float(0),
states('sensor.esp_monitor_cells_voltage_213') | float(0),
states('sensor.esp_monitor_cells_voltage_214') | float(0),
states('sensor.esp_monitor_cells_voltage_215') | float(0)
] %}
{% set max_voltage = voltages | max %}
{% set max_cell = voltages.index(max_voltage) + 1 %}
{% set min_voltage = voltages | min %}
{% set min_cell = voltages.index(min_voltage) + 1 %}
{% set delta = max_voltage - min_voltage %}
attributes:
Maximum_Cell_No: "{{ max_cell }}"
Maximum_Cell_Voltage: "{{ '%.3f' | format(max_voltage) }}"
Lowest_Cell_No: "{{ min_cell }}"
Lowest_Cell_Voltage: "{{ '%.3f' | format(min_voltage) }}"
Voltage_Delta: "{{ '%.3f' | format(delta) }}"
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