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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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General: Smart meter monitoring

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    • CommentAuthorowlman
    • CommentTimeJun 28th 2023 edited
     
    I understand that Smart Meters have the capacity to measure PV export as well as general import, a facility that most suppliers don't readily make available.
    I also understand that it's possible to access this information using the keypad on the meter. I have no idea what that figure is e.g. instant, hourly, daily etc. but not downloadable for scrutiny.

    Has anyone used this facility?
    Has anyone tried independently ( of any SEG scheme ), datalogging PV export. I'm trying to get a better picture of my PV export, not just the 50% deemed that is my FIT contract.
    • CommentAuthorrevor
    • CommentTimeJun 28th 2023
     
    My smart meter measures export. It is very accurate as have a meter on my inverter install and they agree. To access the info on the smart meter you need to get hands on the manufacturers instructions. Find the makers website and search for the model you have. That is what I had to do.
    if i am correct if you have a smart meter then you should be able to get an export payment as well as your FIT. Your FIT is for generation and export for what you actually sent. There are those on this forum I think get this.
    • CommentAuthorowlman
    • CommentTimeJun 28th 2023
     
    Thanks revor, I think you can get PV generation and metered export, but I already receive the deemed 50% export. That's interesting regarding meter manufacturers to get meter access. Some sort of datalogging would be good too.
    • CommentAuthorrevor
    • CommentTimeJun 28th 2023
     
    Posted By: owlmanThanks revor, I think you can get PV generation and metered export, but I already receive the deemed 50% export. That's interesting regarding meter manufacturers to get meter access. Some sort of datalogging would be good too.


    Do you have smets 1 or smets 2 Maybe you need a smets 2 for export payment.
    • CommentAuthorowlman
    • CommentTimeJun 28th 2023
     
    I'm due to have a SMETs 2 fitted this weekend.
    I wasn't intending to change the current FITs contract, simply to get a better understanding of my true export, vis-à-vis Grid import, say for the next year or so.
    •  
      CommentAuthordjh
    • CommentTimeJun 28th 2023 edited
     
    Posted By: owlmanHas anyone tried independently ( of any SEG scheme ), datalogging PV export. I'm trying to get a better picture of my PV export, not just the 50% deemed that is my FIT contract.
    I measure my generation at my generation meter and my consumption/export at my main meter. In both cases I use both an optical reader stuck to the meter and a CT on the cable. I feed both lots into my emoncms system that can draw pretty graphs or export CSV etc. I also record the meter readings by hand at least monthly (daily for generation) for true accuracy.

    If/when I get a smart meter I expect I'll be able to get the export data directly. I'm currently thinking of switching to the Intelligent Octopus tariff which will require a smart meter.

    edit: to add that my FIT contract is currently with Good Energy but they've made a real pig's ear of my account at the moment so I'm thinking of moving it.
    • CommentAuthorMikel
    • CommentTimeJun 29th 2023
     
    I have had a SMET2 meter since June 2021. To date, the percentage export is 65%. Our PV system is 3.84kW and we have a solar thermal system. Interestingly, the percentage export is about 47% for Nov-Feb.

    What I found to particularly useful is the power requirement display (kW) at any one time. You can also get the hourly grid import data. If you have a PV datalogger that shows current power generation, you can use all of this to optimise using very devices, washing machine, oven, dishwasher.

    I have found that it is very difficult to get a zero grid import during the day as my PV doesn’t generate enough power.
    • CommentAuthorowlman
    • CommentTimeJun 30th 2023
     
    Thanks djh; I had a look at open energy monitor site, they seem to have the thing I'm after.

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