Posted by: @darlomrh

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Does anyone have any experience using Melcloud Home and whether the energy reports are reliable or a work of fiction. I have pasted a day this week

That seems too good to be true whilst running on Auto Adaption.

 

COP of 17.7 exceeds the theoretical Carnot maximum so is definitely too good to be true.

There are several periods when its producing energy but not using it apparently.  Thats great, if I believed it, which I dont because its the basis of a perpetual motion machine.

In summary, although I have no experience of using MelCloud, I can say for sure something is wrong.  Hopefully someone can suggest what!

Hi, @darlomrh. That's a really simple question to give a quick answer to, but providing a useful answer is something else entirely.

I don't use Melcloud Home but I do have an Ecodan and am therefore fairly familiar with the raw data that Mitsi kit provides. Ultimately, therefore, what Melcloud Home is interpreting is based on exactly the same raw data as crunched by Melcloud and, indeed, as shown on the little wallbox controller in your home, so it all can be cross-checked in a consistent manner.

Firstly, the obvious answer. There is not a snowball's chance in hell that your heat pump is managing a CoP of 17.74. Either there is an error in the measurement of the figures at the heat pump (unlikely but possible) or there is some other external factor influencing things (quite possible). Whichever it is, though, a CoP of 3-4 is OK/good, 4-5 is great, 5-6 is raising eyebrows and 7+ is unbelievable without independent corroboration.

Secondly, it's worth bearing in mind where the energy consumed and energy produced come from. The energy consumed is reasonably straightforward to measure and so probably fairly accurate; it's also easy to measure independently if you choose to invest in a CT clamp. The energy produced, however, involves a little more black magic; the flow rate determines the volume of water moved in a given period and the delta T (the difference between flow temperature and return temperature) will determine the amount of energy released from that volume of water in that time period. Any variations in the flow rate or delta T during that period will affect the accuracy of the estimate as will the specific gravity of the heating fluid (i.e. does the heat pump know it's pure water or a glycol mix and, if so, is it correct in its understanding?).

All this is only really useful to know in that it's perfectly possible to get the data for a time period for each of the component parts and then for you to do the CoP calculation yourself. That will help you understand if it's a data in problem or a Melcloud Home calculation problem.

In your position, the first thing I'd do is to take a look at the CoP in Melcloud Home over a longer period such as a week or so. If that averaged-out CoP is still unbelievable that'd be my impetus to burrow in further.

Thanks for the replies,

I think it's best I ignore the cop totally in Melcloud Home.

Here is the month snapshot VS  FTC7 values. We weren't at the property in Feb till the 12th

84 kwh consumption seems more plausible than 22.3 🙂

This is a particularly confusing situation for people, @editor may be interested in.

If your Air-to-Water unit has been fitted with the MELCloud WiFi Adapter part number MAC-597IF-E it is only compatible with MELCloud Home,

While they may still be in circulation, older generations such as the MAC-577F-E, MAC587F-E are discontinued but seem to be cross compatible with the old app.melcloud.com and the new MELCloud Home.

When i sign up, regardless of model - i am told MELCloud Home is only for Air-to-Air:

The data in MELCloud Home appears to be inaccurate, controls are buggy (e.g. can't set flow temperature correctly, room temperature minimum has been reported as 30C, second zone control information doesn't appear)

So what do consumers do? (well, without blowing my own trumpet..)

Posted by: @darlomrh

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84 kwh consumption seems more plausible than 22.3

Totally agree. 84kWh in vs 355kWh out gives a total CoP for period of 4.23 which is well within the bounds of credulity (and actually pretty good too). I'd say that's enough info to be able to raise an issue with Mitsi about Melcloud Home and ask them to investigate/fix.

@f1p The main white box has MCH branded all over it and when I signed up for Melcloud, the system couldn't find one of my part/serial numbers (can't remember now if it was the Big white box (technical I know) or the unit outside) whereas MCH did. However the install is indeed supplied with MAC587IF-E the wifi adapter. Also the second zone only recently appeared.

Posted by: @darlomrh

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@f1p The main white box has MCH branded all over it and when I signed up for Melcloud, the system couldn't find one of my part/serial numbers (can't remember now if it was the Big white box (technical I know) or the unit outside) whereas MCH did. However the install is indeed supplied with MAC587IF-E the wifi adapter.

Well, i would suggest you have flexibility to close your MELCloud Home account and return to app.melcloud.com residential then which will be more reliable for you

You can't connect the same adapter to both, so you must exit MELCloud Home fully first

In that case, @darlomrh, I'd fire off a missive to Mitsi and ask what they suggest. Their support is certainly not the worst so put it to test - and then let us know if Mitsi actually are helpful for you.

Posted by: @f1p

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Posted by: @darlomrh

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@f1p The main white box has MCH branded all over it and when I signed up for Melcloud, the system couldn't find one of my part/serial numbers (can't remember now if it was the Big white box (technical I know) or the unit outside) whereas MCH did. However the install is indeed supplied with MAC587IF-E the wifi adapter.

Well, i would suggest you have flexibility to close your MELCloud Home account and return to app.melcloud.com residential then which will be more reliable for you

You can't connect the same adapter to both, so you must exit MELCloud Home fully first

Certainly something I'd try, @f1p, but @darlomrh did say Melcloud couldn't find recognise the system. Worth a second try, I'd guess, but Mitsi support is probably still going to need to be involved at some point I think.

Just been on the phone to Mitsubishi and indeed MCH is not supported for ASHP (yet) so they advised me all I needed to add was the indoorbox box and none of the others to sync up. So now on melcloud and see how that goes. Didn't help that my kit has melcloud branding on it (which they said was a mistake)