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Midea ASHP – how to set weather compensation

Curlykatie · 2023-01-20T17:15:11Z

After lots of help from @derek-m around balancing the system I am now looking for some advice on how best to set weather compensation. We have moved into a 4 bed new build with a Midea ASHP and underfloor heating throughout and individual thermostats in each room. I have looked at the manual and on YouTube but still rather confused as to the best way to set weather compensation. On the main panel I have found the option to select the weather compensation curves- when I click through it says ‘zone 1 high temp mode’ and ‘zone 2 low temp mode’- I have found the high and low temp curves in the manual but unsure which I should be selecting? I also came across a video on YouTube about setting for weather compensation within the serviceman settings? Thank for everyone’s kind help, Katie

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Air Source Heat Pumps (ASHPs)

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Mosibi

(@mosibi)

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05/11/2025 10:31 am

Posted by: @cathoderay

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I'm asking what is the equivalent data/display from a Shelley so called 'integrated power meter', given that what we actually want to measure and record is energy use over time (kWh use per hour/day/whatever).

The Shelly provide “Current” (amp), “Power” (watt) and “Voltage” (V) for the current state and “Total energy” (kWh) as a counter since the last reset. I suspect that the device you referred does (almost) the same.

For myself the reason to use the Shelly devices is that they integrate perfectly with Home Assistent.

🙏

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cathodeRay

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05/11/2025 10:46 am

Posted by: @majordennisbloodnok

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doing what it says on the tin

But what does it actually say on the tin, in words that a thicko like me can understand? Having read most of the Shelly web page linked to above, I am none the wiser.

The Eastron meter has a visual cumulative kWh used display I can read manually, with a modbus option for getting the same kWh data into HA or whatever. What I am asking for is a similar description of what a Shelley device can do. If anyone can add pros and cons of the two devices, so much the better.

Midea 14kW (for now...) ASHP heating both building and DHW

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cathodeRay

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05/11/2025 10:50 am

Posted by: @mosibi

↑

The Shelly provide “Current” (amp), “Power” (watt) and “Voltage” (V) for the current state and “Total energy” (kWh) as a counter since the last reset. I suspect that the device you referred does (almost) the same.

For myself the reason to use the Shelly devices is that they integrate perfectly with Home Assistent.

Thanks, that is exactly what I was hoping for (and apologies for my immediate past comment, posted before I saw your reply).

In summary, the two are different ways of doing almost but not quite the same thing. The differences are the Shelley device has more variables, and more ways of communicating, but doesn't have modbus.

Midea 14kW (for now...) ASHP heating both building and DHW

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benson

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05/11/2025 11:23 am

@mosibi are you able to give an idea of how inaccurate the midea consumption data is at all ie how your Shelly data compares to what the control panel indicates?

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Majordennisbloodnok

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05/11/2025 11:29 am

Ah, understood. @cathoderay.

Eventually, the two are not the same product. The Eastron is a meter pure and simple whilst the Shelly is a smart switch with metering capabilities. That, I suspect, is why the Eastron has a display. Shelly does also have a range of energy meters but once again the emphasis is on the IoT idea of data being crunched elsewhere so none of them have a display. For simple displaying of the information one would be relying on the app or a link with another system such as Home Assistant.

For simplicity, I suspect the Eastron would be the ideal. For meters feeding into a central point Shelly energy monitors might be a good alternative. For monitoring a single outlet, something like the EM Mini Gen4 (which can be installed behind the socket) or for monitoring something beefier - a heat pump, for example - something up to the Pro 3EM 120A. None, as you say, does modbus though, although the range of other communication methods is wide.

105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

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cathodeRay

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05/11/2025 11:39 am

Posted by: @benson

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are you able to give an idea of how inaccurate the midea consumption data is at all ie how your Shelly data compares to what the control panel indicates?

I can't do it for a Shelley device, but I can for Eastron kWh meter - the Midea energy in data is an underestimate of the total energy in to the heat pump, as measured by the Eastron meter, by a factor of around 1.18 (ie I have to, and do, multiply the Midea reported data by 1.18 to get it approximate to the Eastron value), and it is the up-rated value I use for my COP calculations. I have assumed without any real evidence that the extra energy is used by ancillaries eg the circulating pump.

@majordennisbloodnok — thanks, a useful expansion on the pros and cons.

Midea 14kW (for now...) ASHP heating both building and DHW

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