Automation to calculate battery charge percentages

Configuration
1

I’m trying to make an automation that will take the target charge percentage (number.lux_ac_battery_charge_level) for my batteries and deduct current battery charge level (sensor.lux_battery ) to calculate the top up charge percentage required, and change an entity (input_number.battery_topup_level) to that value.

The script below gets the correct value of target charge as well as current charge, but it always return “0” as the topup charge required - ie: it has not updated the entity. What am I doing wrong?

alias: caluculate charge time required
description: >-
  Set the battery charge level based on the predicted solar generation for the
  next day.
trigger:
  - platform: time
    at: "22:00:00"
condition: []
action:
  - service: number.set_value
    data:
      value: >-
        {% set charge_target = ((states('number.lux_ac_battery_charge_level')) |
        float) %} {% set current_charge = ((states('sensor.lux_battery'))|
        float)  %} {% set charge_topup = (charge_target - current_charge) %} 
        {{[charge_topup, 0] | max | round }}
    target:
      entity_id: input_number.battery_topup_level
  - service: notify.notify
    data:
      message: >-
        Charge target = {{ states("number.lux_ac_battery_charge_level") }}
        Current charge = {{ states("sensor.lux_battery") }}   Top up required = 
        {{  states("input_number.battery_topup_level") }} 
mode: single
2 
      value: >-
        {% set charge_target = states('number.lux_ac_battery_charge_level') |
        float(0) %} 
        {% set current_charge = states('sensor.lux_battery') |
        float(0)  %} 
        {% set charge_topup = charge_target - current_charge %} 
        {{ [charge_topup, 0] | max | round }}

Also show us the values for the number and sensor.

3

@parautenbach Thank you. Your code looks tidier than mine, but it still produces the same result.

The message I get is "Charge target = 100 Current charge = 94 Top up required = 0

4

Paste this in your dev tools template editor and give the result here:

{{ states('number.lux_ac_battery_charge_level') }} 
{{ states('sensor.lux_battery') }}
5

73.0
49

Obviously these numbers have changed since the last time I ran the automation, but they are what I would expect them to be. I note that the first one has a decimal point whereas the second one doesn’t?

6

Thanks.

Now paste the corrected template I posted previously and give us the output.

The decimal doesn’t matter. We’re casting to a float in both cases. Your other sensor value will just technically have an unnecessarily high precision, since it’s an int.

7 
value: >-



        11

This is when the first 2 values are:
100.0
89

So it is giving the correct result. A lot of line breaks there, but I don’t suppose that’s an issue? I guess that this narrows the problem down to

 target:
      entity_id: input_number.battery_topup_level

The calculated figure is not being applied to this entity as its value remains 0

8

Because you’re calling the wrong service. Surely your log or the trace would’ve complained.

Change it to:

service: input_number.set_value

No. This only shows in the template editor, because it doesn’t understand YAML. The - in >- is the indicator to strip leading and trailing whitespace. Read up on YAML to know more.

9

Thanks, this has fixed it. No, traces didn’t flag that up. Thank you as well for pointing me to template editor. That will be a useful learning tool for me.

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