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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pash44pump

(@pash44pump)

Estimable Member Member

Joined: 2 months ago

Posts: 58

04/11/2025 8:08 am

@cathoderay and of course others. Has anyone tried to get energy out figures from Midea Smart Home? I am now getting energy in, energy out and COP but the energy in numbers (and therefore COP) are nonsense. For example, November 1st showed energy in of 79kW while my actual total energy usage for that day was 33kW and my base load (without heat pump for heating/DHW) is around 13-14 kW so max for heat pump should have been in the region of 20kW. Given how far out that is, I have no idea whether to trust the energy out number, which was showing at 118kW, which implies a COP of 7.75 for the day as a whole based on my actual energy in number. Very frustrating!

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cathodeRay

(@cathoderay)

Illustrious Member Moderator

Joined: 4 years ago

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04/11/2025 8:49 am

@pash44pump - I stopped using the Mide app ages ago, so my memory is hazy, but I vaguely recall (at least I think I do) two things:

(1) it uses total cumulative kWh in and out as its basic data, ie lifetime kWh in and out. Thus if the energy in is 100kWh at noon today, and it was 97kWh at noon yesteday, then i have used 3kWh over that 24 hour period. It uses the lifetime data to do the interval calculations

(2) it uses integers (whole numbers) for this lifetime data. Over longer periods, that's OK, but over shorter periods it can cause rounding errors.

Note that energy is measured in kWh, not kW, which is power. 1kW of power (say a 1kW conventional electric heater) on for 1 hour uses 1 kWh or energy.

Posted by: @pash44pump

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I have no idea whether to trust the energy out number, which was showing at 118kW

Bearing in mind the above note about kW and kWh, I would be seriously alarmed if you property was running at that power rating, which is roughly 40 3kW kettles all on the go at once. Over 24 hours, that will consume 2832 kWh of energy. At 25p/unit (or kWh), that is over £700 per day...

Check exactly what that 118 figure is: units, and over what period. If you can do it, posting screenshots might help. Here's a rare example of one I took when I did have the app. It shows an 8 hour period from a single day, with the hourly kWh in ranging between 1 or 2 exactly, no decimal places because of the integer based counting: