Bosch Dishwasher Energy Monitoring | Home Assistant | Page 1

toxic blade Mar 25, 2025, 3:12 PM

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I have a Bosch dishwasher, which reports energy usage ....but only as a percentage (i.e: Energy: 61% - see second screenshot). My best guess (in conjunction with ChatGPT) is that this percentage is a percentage of some arbitrary theoretical maximum energy consumption for that cycle.

That said, that's just a guess because the BSH API documentation isn't terribly helpful. With the help of ChatGPT, I ended up with this sensor to approximate the energy usage of my dishwasher so that I could start tracking it in the energy dashboard. However, I think something is a little off because I somehow end up with my dishwasher using more energy than the total energy usage in that given period (see first screenshot) and a report that my dishwasher is apparently using 4kWh of energy...which seems....off.

{% set base_energy = 1.2 %}
{% set forecast = states('sensor.dishwasher_common_option_energyforecast') | float(100) %}
{% if forecast > 0 %}
  {{ (base_energy * (100 / forecast)) | round(2) }}
{% else %}
  "Unknown"
{% endif %}

What am I doing wrong here?

restive harness Mar 25, 2025, 3:13 PM

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You're probably confusing power and energy.

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Well I'm not actually sure. It's at 61% for ~4 hours?

toxic blade Mar 25, 2025, 6:25 PM

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Yeah, it's at 61% for 4 hours.

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I'm guessing that's "61% of it's max energy usage for 4 hours" but idk

restive harness Mar 25, 2025, 6:32 PM

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What is base_energy, 1.2 what?

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kW or kWh?

toxic blade Mar 25, 2025, 6:34 PM

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kW

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that was my understanding anyway

restive harness Mar 25, 2025, 6:36 PM

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So if you want to get energy from that, you'll need a power sensor which would be 1.2 kW * 61% = 732W continuous power.

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You would then need to Riemann sum that sensor to get an energy sensor.

toxic blade Mar 25, 2025, 6:36 PM

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Yeah...so I should trade that template sensor for a power sensor?

restive harness Mar 25, 2025, 6:36 PM

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Well the template is how you make the power sensor

toxic blade Mar 25, 2025, 6:37 PM

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ohhh

restive harness Mar 25, 2025, 6:37 PM

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And then Riemann sum integration creates the energy sensor from that power sensor.

toxic blade Mar 25, 2025, 6:37 PM

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ic

restive harness Mar 25, 2025, 6:37 PM

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then you add energy sensor to energy dashboard

toxic blade Mar 25, 2025, 6:37 PM

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yeah

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so basically re-do the math on the sensor to be:

{% set base_energy = 1.2 %}
{% set forecast = states('sensor.dishwasher_common_option_energyforecast') | float(100) %}
{% if forecast > 0 %}
  {{ (base_energy * forecast) | round(2) }}
{% else %}
  "Unknown"
{% endif %}

restive harness Mar 25, 2025, 6:38 PM

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well forecast I assume is "61"

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So you'll need to convert to float and /100

toxic blade Mar 25, 2025, 6:38 PM

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in this specific case, yes.....but it changes by program

restive harness Mar 25, 2025, 6:39 PM

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I mean it is a string

toxic blade Mar 25, 2025, 6:39 PM

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Oh. Yes, the % is an attribute.

restive harness Mar 25, 2025, 6:39 PM

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I guess you want this:

  {{ (base_energy * (forecast / 100)) | round(2) }}

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that's your kW

toxic blade Mar 25, 2025, 6:40 PM

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Also, I just realized line 2 doesn't make any sense. | float (100) - a float with 100 decimal places? WTF?

restive harness Mar 25, 2025, 6:40 PM

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100 is not decimal places

toxic blade Mar 25, 2025, 6:40 PM

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it's not?

restive harness Mar 25, 2025, 6:40 PM

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it is the default value if undefined

toxic blade Mar 25, 2025, 6:40 PM

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Oh right

restive harness Mar 25, 2025, 6:40 PM

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I would probably have said float(0)

toxic blade Mar 25, 2025, 6:41 PM

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if I do that, I can probably simplfy that expression and get rid of the else then, right?

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{% set base_energy = 1.2 %}
{% set forecast = states('sensor.dishwasher_common_option_energyforecast') | float(0) %}
{{ (base_energy * (forecast / 100)) | round(2) }}

restive harness Mar 25, 2025, 6:41 PM

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seems reasonable

toxic blade Mar 25, 2025, 6:42 PM

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I take it that editing this isn't going to recompute the historical data

restive harness Mar 25, 2025, 6:42 PM

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nope

toxic blade Mar 25, 2025, 6:43 PM

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bummer.

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So for this power sensor, I'm guessing I want:

Unit of Measurement: kW
Device Class: Power
State class: Measurement

?

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looks like I can't select the integral sensor in the energy dashboard

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#

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I wonder if it's just because there's no data in there yet

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Okay, I think I fixed it - I had to go into the sensor and set the unit of measurement to W, then in the template options and select kW.

For some reason anything else causes the sensor to not provide the correct device class and options to the energy sensor

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I don't really understand WHY that's the case though

restive harness Mar 25, 2025, 7:32 PM

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the riemann won't be correct until after the source power sensor updates at least once

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it kind of starts out in an unknown type state

toxic blade Mar 26, 2025, 12:48 AM

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Ah.

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Why the discrepancy in units to make things work?

restive harness Mar 26, 2025, 12:59 AM

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I'm not aware of any issues related to units.

toxic blade Mar 26, 2025, 1:08 AM

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in order for the dishwasher energy sensor to appear in the energy dashboard and be selectable, I have to set the unit to watts in the main sensor config, but kW in the template config.

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the discrepancy doesn't make sense to me

toxic blade Mar 26, 2025, 1:25 AM

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if I set both units to kW - it somehow messes with the device class

restive harness Mar 26, 2025, 3:31 AM

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I would leave them both as kW, and then wait until after it updates once and see if the Riemann has correct value.

toxic blade Mar 26, 2025, 3:32 AM

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have done for a while and run the dishwasher...nada

restive harness Mar 26, 2025, 3:32 AM

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hm I'm not sure then.

toxic blade Mar 26, 2025, 3:33 AM

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the energy sensor is reorting 0.0 kW/h too

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the power sensor shows 0.73 kW

restive harness Mar 26, 2025, 3:33 AM

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did you select k in the Riemann settings?

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kkWh is too many k's 🤣

toxic blade Mar 26, 2025, 4:29 AM

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waaait a fuckin sec

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no - i can't swlect the unit in the riemann settings - I think it's the columination of the two kWh sensor settings

restive harness Mar 26, 2025, 4:30 AM

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You don't pick the unit, but you can pick the prefix

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if the input is already kW I guess you don't want that.

toxic blade Mar 26, 2025, 4:35 AM

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nope

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I've deleted the sensor and re-made it

restive harness Mar 26, 2025, 4:40 AM

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worked for me

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toxic blade Mar 26, 2025, 4:40 AM

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GOT IT!

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I ended up deleting them both and removing the metric prefix altogether

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now let's see if this shows up in the energy dashboard

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ooh it does!

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looks like that worked - ty!

toxic blade Mar 26, 2025, 4:05 PM

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Hmm. Still something a little off, but I think it's with the Riemann sensor. I just ran a rinse cycle and it seems to think my dishwasher has used 4kWh in like 5 minutes.

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the fact that it's a factor of 100 is suspicious...

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This device usage here looks odd as well - the dishwasher has seemingly used more energy than the entire house did in that period

restive harness Mar 26, 2025, 10:52 PM

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toxic blade Hmm. Still something a little off, but I think it's with the Riemann sensor. I ...

used 4kWh in like 5 minutes.
Your chart shows you were running at 0.7kW for at least an hour or more.
Riemann only updates the sum on a state change (unless you specify max-sub-interval).

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When you have a sensor that's static like that for a long time you would benefit from setting a sub interval.

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Then it will update more frequently and assign energy to the correct hours.

toxic blade Mar 26, 2025, 11:00 PM

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I mean it wouldn't really because the energy sensor from the dishwasher reports whatever until you pick a new program.

restive harness Mar 26, 2025, 11:00 PM

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Oh it doesn't go back to 0 at the end of the cycle?

toxic blade Mar 26, 2025, 11:08 PM

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Nope

restive harness Mar 26, 2025, 11:10 PM

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do you have an on/off sensor?

toxic blade Mar 26, 2025, 11:15 PM

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Yeah

restive harness Mar 26, 2025, 11:25 PM

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You should use that in the power template.

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e.g. 0 if off else (base*power)

toxic blade Mar 26, 2025, 11:30 PM

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Yeah maybe I will... Though interestingly enough it already looks to be doing that

#Bosch Dishwasher Energy Monitoring