canalsiderenovation Posted February 9, 2021 Share Posted February 9, 2021 Someone did link one somewhere but I can't find it now. We are monitoring our HP use now daily but I want to try and work out what our 'other' use is. Between Friday and Monday our other use (not heat pump) averaged out at 8.3kWh a day but they between yesterday afternoon and today it was 20kWh and we can't work out why. Link to comment Share on other sites More sharing options...
SteamyTea Posted February 9, 2021 Share Posted February 9, 2021 (edited) Probably sold now. Search eBay for CurrentCost energy meter. For your monitoring you need a clamp on type (CT) and not the optical one. Here is one. https://www.ebay.co.uk/itm/Current-Cost-Monitor/293993103408?hash=item44735ac030:g:bxQAAOSwnEJgCbZA Edited February 9, 2021 by SteamyTea 1 Link to comment Share on other sites More sharing options...
canalsiderenovation Posted February 9, 2021 Author Share Posted February 9, 2021 14 minutes ago, SteamyTea said: Probably sold now. Search eBay for CurrentCost energy meter. For your monitoring you need a clamp on type (CT) and not the optical one. Perfect thanks I'll have a look on eBay now. Link to comment Share on other sites More sharing options...
ProDave Posted February 9, 2021 Share Posted February 9, 2021 Something like this to monitor one appliance at a time https://www.ebay.co.uk/itm/UK-Plug-in-Electricity-Power-Consumption-Meter-Energy-Monitor-Watt-Kwh-Analyzer/333855058767?hash=item4dbb4feb4f:g:36kAAOSwL0Nf~Xn7 One day I will buy one and get to the bottom of our "other stuff" energy usage. Plug each appliance into it for a day or a week and see how much everything is using. 1 Link to comment Share on other sites More sharing options...
canalsiderenovation Posted February 9, 2021 Author Share Posted February 9, 2021 Just now, ProDave said: Something like this to monitor one appliance at a time https://www.ebay.co.uk/itm/UK-Plug-in-Electricity-Power-Consumption-Meter-Energy-Monitor-Watt-Kwh-Analyzer/333855058767?hash=item4dbb4feb4f:g:36kAAOSwL0Nf~Xn7 One day I will buy one and get to the bottom of our "other stuff" energy usage. Plug each appliance into it for a day or a week and see how much everything is using. It's my new obsession. As I've been monitoring our heat pump use daily along with the solar too it's meant I've been able to separate out the heating/hot water over other things. What we can't seem to work out is why in the past 24 hours it doubled for our 'other' use. Link to comment Share on other sites More sharing options...
Bramco Posted February 9, 2021 Share Posted February 9, 2021 If you want more detail and some history get an emonPi from the open energy crew in Wales - great kit. You can set up as many dashboards as you want and also measure temperatures. https://shop.openenergymonitor.com/emonpi/ I should add I'm nothing to do with them, except from being a member of the forum there. It's all open source, so we set up our own system on a spare Rasp Pi and also built a Solar PV diverter following guides. There's a huge amount of info on the forum. Simon 1 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted February 9, 2021 Share Posted February 9, 2021 11 minutes ago, Bramco said: It's all open source, so we set up our own system on a spare Rasp Pi What I have done with the CurrentCost This is the data I collect: Date and Time, Temperature, Power 18/01/2021 00:00:07,19.9,00058 18/01/2021 00:00:18,19.9,00049 18/01/2021 00:00:24,19.9,00045 18/01/2021 00:00:29,19.9,00042 18/01/2021 00:00:35,19.9,00039 Link to comment Share on other sites More sharing options...
Bramco Posted February 9, 2021 Share Posted February 9, 2021 (edited) An emonPi would give you more granularity and the possibility of tailoring it to your requirements, but hey, it's horses for courses. There are many ways to do this - was just suggesting one we've found very useful. For example Simon Edited February 9, 2021 by Bramco Link to comment Share on other sites More sharing options...
canalsiderenovation Posted February 9, 2021 Author Share Posted February 9, 2021 54 minutes ago, Bramco said: An emonPi would give you more granularity and the possibility of tailoring it to your requirements, but hey, it's horses for courses. There are many ways to do this - was just suggesting one we've found very useful. For example Simon You lost me at Rasp Pi ? Unless it's the sweet shortcrust pastry variety 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted February 9, 2021 Share Posted February 9, 2021 Here is a picture of my CurrentCost monitor. What you cannot see us the little Raspberry Pi Zero in the box it is sitting on. All the RPi does is collect all the data for later analysis in Excel. Very simple and reliable. Link to comment Share on other sites More sharing options...
Bramco Posted February 10, 2021 Share Posted February 10, 2021 19 hours ago, canalsiderenovation said: You lost me at Rasp Pi I didn't say Rasp Pi - I said emonPi. It has a Pi in it with everything set up. Simon Link to comment Share on other sites More sharing options...
Bitpipe Posted March 9, 2021 Share Posted March 9, 2021 (edited) On 10/02/2021 at 15:27, Bramco said: I didn't say Rasp Pi - I said emonPi. It has a Pi in it with everything set up. Simon Looks interesting. My meter is in a kiosk remote from house, however I have a solar PV diverter (to drive supply to hot water generation when otherwise exporting) and it has a similar clamp on sensor on n house wiring so I suppose I could put it adjacent to that? Edited March 9, 2021 by Bitpipe Link to comment Share on other sites More sharing options...
TonyT Posted March 9, 2021 Share Posted March 9, 2021 I spent all of £17 for a din rail electricity meter, the size of an MCB that can take 45 amps. Good value and worth considering for certain installations where you are happy to go and read the meter. I’m going to install on my EV charger to record this consumption. Link to comment Share on other sites More sharing options...
SteamyTea Posted March 9, 2021 Share Posted March 9, 2021 46 minutes ago, TonyT said: I spent all of £17 for a din rail electricity meter, the size of an MCB that can take 45 amps. Can it link up to a logger? Do you have a link to it? Link to comment Share on other sites More sharing options...
TonyT Posted March 9, 2021 Share Posted March 9, 2021 https://owen-brothers.co.uk/singlephase/ob112-50a-sp-meter-mid-b-d.html it has 2 terminals for pulse output. Link to comment Share on other sites More sharing options...
SteamyTea Posted March 9, 2021 Share Posted March 9, 2021 16 minutes ago, TonyT said: https://owen-brothers.co.uk/singlephase/ob112-50a-sp-meter-mid-b-d.html it has 2 terminals for pulse output. Thanks A quick look and it says that basic current is 5A. My night storage heater has a load of 13A for up to 7 hours. So may struggle, will have to check. Useful website and reasonable prices though. Link to comment Share on other sites More sharing options...
Bramco Posted March 9, 2021 Share Posted March 9, 2021 2 hours ago, Bitpipe said: Looks interesting. My meter is in a kiosk remote from house, however I have a solar PV diverter (to drive supply to hot water generation when otherwise exporting) and it has a similar clamp on sensor on n house wiring so I suppose I could put it adjacent to that? If you can put a clamp next to the the one you have in the CU already then you would be fine. Gives instantaneous power consumption. Simon Link to comment Share on other sites More sharing options...
Bramco Posted March 9, 2021 Share Posted March 9, 2021 20 minutes ago, TonyT said: https://owen-brothers.co.uk/singlephase/ob112-50a-sp-meter-mid-b-d.html it has 2 terminals for pulse output. There are versions around with and RS 485 interface which give instantaneous power. The issue with a pulse output is that you're only measuring power in chunks, a 1000th or 100th of a kWh (depending on the device) and to see things in real time you need the instantaneous power reading. Simon Link to comment Share on other sites More sharing options...
SteamyTea Posted March 9, 2021 Share Posted March 9, 2021 1 minute ago, Bramco said: The issue with a pulse output is that you're only measuring power in chunks, a 1000th or 100th of a kWh (depending on the device) and to see things in real time you need the instantaneous power reading. While that is true, if you are long term logging it reduces the file size. Link to comment Share on other sites More sharing options...
PeterW Posted March 9, 2021 Share Posted March 9, 2021 Shelly EM will do it. Can get one with a pair of 50A clamps and it will sense the whole house and the ASHP etc https://shellystore.co.uk/product/shelly-em-50a/4 Link to comment Share on other sites More sharing options...
TonyT Posted March 9, 2021 Share Posted March 9, 2021 It can handle up to 45amp Link to comment Share on other sites More sharing options...
Bramco Posted March 10, 2021 Share Posted March 10, 2021 14 hours ago, SteamyTea said: While that is true, if you are long term logging it reduces the file size. And 1TB of storage is less than £50, so file size really isn't an issue. Anyone wanting to get a handle on their consumption and generation should decide whether they are happy with low resolution data or real time data. I've found it very useful to have the real time data and have data since 2016 and the disk it is saved on is . Simon Link to comment Share on other sites More sharing options...
SteamyTea Posted March 10, 2021 Share Posted March 10, 2021 24 minutes ago, Bramco said: Anyone wanting to get a handle on their consumption and generation should decide whether they are happy with low resolution data or real time data. I found it is really down to how much post analysis one want to do and what you are actually after finding out. Data can be a little confusing sometimes. Here is an example. Temp Diff Power Ext Temp Internal Temp Count Hours 7 414 8 15 1 8 7478 10 19 1 9 2161 10 20 34 10 1205 10 20 101 11 1241 9 21 134 12 1174 8 20 177 13 1419 6 20 156 14 1617 5 19 93 15 1153 4 19 104 16 1748 3 19 116 17 1502 2 20 95 18 755 2 20 56 19 388 1 21 18 20 700 1 22 13 21 1039 1 22 5 It shows the mean power (W), mean external temp (°C), mean internal temp (°C) and the number of hours in each temperature difference bin. The important thing is that the first two rows only account for 2 hours out of 1104 hours (had the door open and then a fan heater and oven on). Similar is true for the last 4 rows, they only account for 8% of the time, even though they were extreme temperature difference (for down here). The main thing I wanted to know was how thermally stable my lightweight house is, and the amount of energy it uses per degree temperature difference. So taking the data between the 10°C and 17°C temperature difference bins, my house is within 1°C either way of my target temperature (20°C) with an average power consumption of 1.382 kW. This works out as a mean of an extra 56W per °C temperature difference. The confusing bit is if the extremes are taken into account, a total of 10% of the time (over this period, winter 1104 hours), it shows that there is a negative slope -162W/°C. The kWh difference is an extra 16 kWh/°C (excluding the extremes) and -3 kWh/°C including the extremes. So the moral is, be careful with data. (The other moral is that it is easy to make an error) Link to comment Share on other sites More sharing options...
joth Posted March 10, 2021 Share Posted March 10, 2021 (edited) A slightly more elaborate option is https://www.brultech.com/greeneye/ 32 channels of monitor, plus 4 pulse counters. put it be the CU and monitor each circuit individually. There's no way the energy savings it enables would payback the cost of buying it, but great for the data obsessed Edited March 10, 2021 by joth Link to comment Share on other sites More sharing options...
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