search

Arnold-n / P1P2MQTT

Monitor and control Daikin/Rotex (hybrid/Altherma) heat pumps via the 2-wire P1/P2 thermostat interface with an ATmega328P, ESP8266, and electronics. The P1P2Serial library and P1P2Monitor program perform low-level bus operation, the P1P2-bridge-esp8266 program interprets data from/to MQTT supporting Home Assistant MQTT discovery. P1P2Serial may also be used for other Japanese Home Bus System based standards: DIII-NET (F1/F2) bus, Mitsubishi M-Net bus, Toshiba TCC-Link, Hitachi H-link, Panasonic/Sanyo SIII-Net, Haier, York, and others.
Other
324 stars 62 forks source link

Invalid heat pump power measurement? #92

Closed AlbrechtL closed 11 months ago

AlbrechtL commented 11 months ago

Thanks for this great project and hardware!

I have a strange heat pump power measurement behavior (see graph below). The orange line are the numbers directly reported from the heat pump. The blue line are the numbers read from a smart power meter. The orange line should be a little bit lower than the blue line but it is the other way around. What is really strange is that sometimes the reported orange numbers are negative. Can it be that the heat pump power measurement is wrong?

image

Firmware: 0.9.43 Daikin EHBX08DA9W

Arnold-n commented 11 months ago

You're welcome! I think I will rename Power_Heatpump to Heat_Produced_Heatpump as the name is confusing: the orange line is actually heat produced: flow dT 0.0697, and it is really negative during defrosts.

AlbrechtL commented 11 months ago

Thanks for the clarification!

Axelaar commented 4 months ago

I updated to P1P2MQTT bridge v0.9.53 and P1P2Monitor v0.9.54 from versions 9.42. In those versions Power_Heatpump was available, as the calculated value of the heat produced. In that older version it was positive for heating, and negative for cooling. The topic was listed under .../M/9/... What is the equivalent for that topic in this new version?

Arnold-n commented 4 months ago

For answer see https://github.com/Arnold-n/P1P2MQTT/discussions/116