Oh sorry @majordennisbloodnok, I see you have already responded; I think our posts crossed in the err… post!😉 Regards, Toodles.

@papahuhu So that warning appears to relate to the removal of access to data thus denying the installer of any monitoring capabilities. I don’t know just how much observation the average installer might make of a customer’s heat pump but I can see that removing their access would frustrate any attempts that they might make. Regards, Toodles.

Posted by: @odd_lion

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Posted by: @majordennisbloodnok

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Posted by: @odd_lion

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I wonder if anyone has managed to tap into the Modbus on their ASHP. It's beyond my technical ability, but I imagine it wouldn't be that hard or expensive, certainly cheaper than the £550 for an open energy monitor.

Absolutely. There are quite a few of us who communicate locally with our heat pumps - probably more than use something like Homely.

Whilst you say it’s beyond your technical ability, one of the benefits of this forum is the support we give each other. There are plenty here who have been guided through setups they’d’ve found daunting if they’d had to work it all out alone. Who knows, you might find yourself deciding to follow that route….

 

Thanks @majordennisbloodnok. I'm not scared of wiring or tapping into Modbus etc, just haven't come across this in my travels so I would definitely require some tips from others on the forum.

I'm amazed that Homely et al are being allowed to keep end users ignorant (ie, consumer shouldn't know or understand, just pay the bills and see the numbers we give you), it's a very unhealthy and entirely unsatisfying arrangement.

That’s a drum many of us have been banging as loudly as we can for quite some time. Whilst I don’t see how allowing access to that data could be forced on Homely, I totally agree that it’s entirely unhealthy and unsatisfactory.

@toodles Intentional opening of any warranty “can of worms” small print is not something I’d feel comfortable in doing, but I’m a cautious and cynical creature. But others may have a different tolerance for risk. 
Out of warranty tinkering, anything goes.

Posted by: @papahuhu

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or moving away from the original installer may have warranty implications.

I think the word MAY is important there. There are no changes I see I can make via Homely that I can't make directly on the screen of my Samsung MIMs unit.  If I have access to them there how could Samsung claim changing them on Homely would be any different, or even know where they had been changed? You could have access but not make any changes, that would only be useful for the installer to do as they wouldn't need to come to your house to make changes.  I do think that for you to have access to the account your installer would lose access so they wouldn't be able to check on your HP remotely.  My homely wasn't fitted by my installer so I didn't upset anyone by gaining access to the data.

I find the Homely installer portal useful for checking on how Homely is controlling the system, seeing the times it is switched on, the flow temperature it sets etc.  I noticed the the COP figures it reports are very different to the figures reported by my Samsung unit so I added an elctricity meter with CT clamps on the heatpump to confirm if the Samsung kWh figures are correct. The meter is a simple unit and I don't know how accurate it is but it is quite close to the figures the Samsung unit gives.  Homely's estimate of kWh input is a lot lower meaning the COP figures are over estimated so their disclaimer at the top of the page is worth reading.

The 'heat delivered' figure matches fairly closly between Samung and Homely. I don't have a heat meter to check if they are correct but they are close enough for me to think they are probably about right.

@johnnyb That’s strange, how does homely determine COP other than utilise the Samsung consumption and generation data. Seemingly the only way they could be different is in definition of the period that the ratio is being measured over.
I power my heat pump via a battery, so I am confident in that there is correlation between battery supply output and heat pump consumption, but I don’t know how Samsung measures/calculates heat generation, but I’m guessing its delta T flow/return and flow rate. There are multiple measurement and rounding inaccuracies, so it’s never likely to be better than +/- 10%.

I’ve dealt with Samsung domestic refrigerator warranty claims in the past, they were not generous in their interpretation of compliance with Ts&Cs. Their customer service and tech support was outrageously poor. Maybe the heating division of the business is more generous, I don’t know. I have had dealings with the Koreans in the past, providing professional services. There are vast cultural differences between the 2 nations, more so than any nationality I’ve ever worked with.

Posted by: @johnnyb

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Homely's estimate of kWh input is a lot lower meaning the COP figures are over estimated so their disclaimer at the top of the page is worth reading.

Same experience with our midea and homely. Homely would overestimate COP by a fair bit compared with the wired controller readings. The very controller to which it is directly connected to via modbus…..

Make of that what you will. It certainly didn’t help improve my perception of their operating methods. 

@toodles Looking at my nett export, the weather forecast and the dip in octopus outgoing, I’m getting that IOF switch impulse building for 1st March. Is that when you normally take the plunge please? When I checked for our region a few days ago the rates were marginally better than last year.

@papahuhu Last year was my first time for IOF and I think I jumped just a little too early for the scheme to work in my favour. I know that @old_scientist has mentioned that IOF has worked for him though. I didn’t stay the course due to their algorithm that caused early recharge problems for my setup. I hope to have another go this year but I don’t think my solar harvest is quite as good as @old_scientist has experienced. Regards, Toodles.

@toodles I noticed that in the past, when you have posted screenshots of your PW output, they are visually different to mine. I wonder if you are running an older version of the app and whether that may be related to any troubles you may be experiencing? Not saying that I’m correct. 
Im on v4.46.6-3411 if it helps.

@papahuhu Tesla says my app is v4.54.0-4094. Regards, Toodles.

@toodles Yours is even more current than mine so it’s nothing to do with it then. I’ve just checked and it looks like yours with the solid yellow histogram bars if I uncheck the energy flow icon, thats why solar production looked so different.