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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.
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Sensors for Power Consumption and Realtime COP not working #101

Open nicx opened 1 week ago

nicx commented 1 week ago

Maybe it's the same problem: My sensors for Power consumption (HC_Power) and Realtime COP (HC_COP) are always 0. Power Production Sensors are working, COP-Lifetime seems also correct. What could I check to find the reason for that? :)

Arnold-n commented 1 week ago

It's the same problem: power consumption and real-time COP calculation rely on an external electricity meter providing data via P1P2/P/meter/U/9/Electricity_Power. Daikin unfortunately does not provide any real-time consumption data via the P1/P2 interface. So without external input, these values remain 0.

HomeWizard meter users may use a local API and a separate ESP8266 to request data from the meter and copy it to MQTT.

nicx commented 1 week ago

@Arnold-n ah ok. understood. so could I populate thempower value from my espaltherma to this topic and then the COP is calculated automatically? should the value be the total power of the heatpump with or without the backup heater?

Arnold-n commented 1 week ago

Yes, but it may be less accurate than a real external electricity meter, as the current reported by ESPAltherma has low resolution (0.2-0.3A), and does not take blind power into account. For COP the compressor power would be needed. The code for the backup heater power input is not complete yet (and less useful).