Is there any way to discover the Daikin actual electrical power level?

[antwin]

I - like others - would like to control the Daikin output to match available solar power.
It would be very useful to know the actual electrical power consumption at any one time.
At the moment I am estimating it as
(liquid - roomTemp) * fanrpm
However, this is obviously ver imprecise, non-linear and has a time lag.
I note that the mqtt status give a "Wh":2370100 parameter.
Is this 'watt-hours"? How is it calculated?

[MUN0X]

Yes should be Wh.
I guess you could make a derivative sensor as a helper in home assistant. But I honestly doubt that the resolution of 100Wh is small enough to produce a meaningful sensor.

I installed a power clamp on the mains to the daikin

[revk]

I too have a power clamp (Shelly, running Tasmota).

[Tarudro]

Can recommend this little guy:
Shelly Plus PM Mini Gen3

PS. Would appreciate a short info on @antwin how you are controlling your Daikin to scale the power?
#450

[antwin]

Thanks for the info on the Shelley - looks interesting.
I'm controlling the power by setting the 'demand' parameter. This does seem to work, although there is a bit of a time lag between setting a demand and the 'liquid' termperature changing. But there is definitely a correlation.

[44616E]

I do it currently two ways.
I use the Wh output and measure the time between changes plus a minimum time of 15 minutes or so. So at higher power draws it may be a few hundred watts hours in that 15 mins. This gives a result +/- 20% but is slow to update.

The other way which works for my units is I have a lookup table for compressor frequency (which is nonlinear) and also a table for power draw at different fan speeds) then just add the two together. This works reasonably well.

[rug1024]

I only use Sonoff DUAL R2 with Tasmota-Firmware for Energy-Measurement.
Those values can of course be passed on via MQTT or processed on-device (script), possibilities with Tasmota are endless.

[44616E]

@rug1024 I would like to do that but there is no room in the switch board.

[antwin]

I now have a Shelly installed, so I've been comparing its output with my crude algorithm. To my surprise, they are in reasonable agreement - if you take into account that there is a time lag, since I read the liquid temperature.
In case you want to check, it's:
powerEst = (liquid - roomTemp) * fanrpm / 12 (in degrees C, and Watts)