EmonHub support for Samsung Heatpump Monitoring via Modbus

[glyn.hudson]

@william1066

Thanks Glyn - all very useful. I just wanted to point out that on my system you have to enable some of the “new registers” [as Samsung calls them in the manual] first, before you can read or read/write them.

Page 18 on the manual I have.

Correct, the emonHub interfacer should do this

@tom.delahaye

What information on the performance of the HP does the Homely unit provide? Does it give and estimated COP?

No, I don’t think it does because the Samsung modbus interface does not report the electrical energy consumed.

@mjc87

The Samsung control panel remains active though so you can view the flow temps energy consumed and energy produced on there to get an estimate of the COP.

In my experience Samsung does a very poor job of providing accurate monitoring data because of temperature sensor inaccuracies. At least on my ASHP Samsung is underreporting heat delivered by about 30%, see my post here on this thread:

Samsung Air Source Heat Pump Installation with monitoring

Samsung measures the electricity use pretty accurately, although it doesn’t include the power used by the pump(s). However, Samsung does a very poor job of measuring heat output. At least on my system, the heat output displayed by Samsung is 30% less than my heat meter. I think this is party down to Samsung assuming glycol is used (I’m not using glycol) and party due to the Samsung temperature underreporting the temperature of the flow/return. Samsung’s temperature measurements are about 1° C …