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Energy Monitor with Time of Day graphing

  • 11-09-2018 11:43am
    #1
    Registered Users Posts: 626 ✭✭✭ conor_mc


    I've looked at a few energy monitors online I just can't see if they have Time of Day graphing, which would be crucial in understanding the potential payback on Solar PV.
    Can anyone make any recommendations?


Comments

  • Registered Users Posts: 275 ✭✭ macgabhs


    conor_mc wrote: »
    I've looked at a few energy monitors online I just can't see if they have Time of Day graphing, which would be crucial in understanding the potential payback on Solar PV.
    Can anyone make any recommendations?

    Openenergy monitor will do it gives a graph like this


  • Hosted Moderators Posts: 22,656 ✭✭✭✭ beertons


    Efergy?


  • Registered Users Posts: 626 ✭✭✭ conor_mc


    Thanks for the suggestions. I was hoping for one that does average consumption by hour of day over a period of days/weeks though, any ideas? I guess the Efergy product has a csv export and I could graph it myself. The openenergy range just seems a bit pricey compared to commercial products (or else I’ve read it wrong!).


  • Closed Accounts Posts: 3,364 ✭✭✭ rolion


    OWL !?

    461118.jpg


  • Registered Users Posts: 626 ✭✭✭ conor_mc


    rolion wrote: »
    OWL !?

    Thanks rolion, looks like you can’t group by hour of day on owl though. I guess once I can see each day, I can work out roughly how much we use in daylight hours, during night rate hours, etc.


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  • Closed Accounts Posts: 3,364 ✭✭✭ rolion


    conor_mc wrote: »
    Thanks rolion, looks like you can’t group by hour of day on owl though. I guess once I can see each day, I can work out roughly how much we use in daylight hours, during night rate hours, etc.

    OWL exports to csv file format where the reports are recorded every minute,at least 3 times if data is modified.
    Please see attached.
    From there,you can create your own graphics,reports,diagrams and so on...
    If you smart,you can work out a PHP and mySQL insert / manipulation and create your own OWL GUI interface ! :)


  • Registered Users Posts: 626 ✭✭✭ conor_mc


    Perfect, can definitely work up what I’m looking for with that output. Thanks rolion!


  • Closed Accounts Posts: 3,364 ✭✭✭ rolion


    conor_mc wrote: »
    Perfect, can definitely work up what I’m looking for with that output. Thanks rolion!

    Post back here something nice... ;)


  • Posts: 0 [Deleted User]


    Owl requires a subscription fee. First you pay for the meter then you pay to look at the readings.
    It requires an internet connection and doesn't have a handset.
    Accuracy is ± 10%
    Quadruple fail.


  • Closed Accounts Posts: 3,364 ✭✭✭ rolion


    Owl requires a subscription fee. First you pay for the meter then you pay to look at the readings.
    It requires an internet connection and doesn't have a handset.
    Accuracy is ± 10%
    Quadruple fail.

    Subscription fee !? From where,since when ?
    Why would you need a handset for...i hate myself for saying that but these days all are going headless in the cloud,isn't ?With nice interface and reports.
    Accuracy ... Show me a device made DIY or hobby that gives you 0% errors .

    Thanks.


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  • Closed Accounts Posts: 844 H.E. Pennypacker


    The Efergy monitor isn't perfect (it doesn't allow for dual tariff for instance) but it does give reasonably informative reports and the option to export if you want to do your own analysis. You can set your own voltage readings on it to help a little with accuracy but I've no idea what the overall accuracy of it is


  • Registered Users Posts: 626 ✭✭✭ conor_mc


    Owl requires a subscription fee. First you pay for the meter then you pay to look at the readings.
    It requires an internet connection and doesn't have a handset.
    Accuracy is ± 10%
    Quadruple fail.

    Yeah, the amazon reviews I read yesterday slated the accuracy a fair bit. Didn’t know about the € subscription, that’s a deal-breaker.


  • Posts: 0 [Deleted User]


    rolion wrote: »
    Subscription fee !? From where,since when ?

    From OWL. Since Jan 2018. Every 2 years.
    rolion wrote: »
    Why would you need a handset

    Instantaneous readings without faddling.

    rolion wrote: »
    these days all are going headless in the cloud,isn't ?

    Proprietary systems. Relying on the unreliable internet, privacy issues, accessibility issues.
    Just because you can doesn't mean you should.
    Keep it simple. There's no good reason it can't work standalone other than arrogance and persuasive marketing.

    rolion wrote: »
    With nice interface and reports.

    Subjective

    rolion wrote: »
    Accuracy ... Show me a device made DIY or hobby that gives you 0% errors .

    There isn't one.


    447446.JPG

    As I have mentioned before I don't do grid-tied systems. whistling.gif

    The meter above on the right is my favourite. It has an accuracy of ±0.3%.
    The solar charge controller I use (SunSaver MPPT in that installation) has both live and historical data I can (when I care to) access via Modbus.

    Anything using a current transformer for measurement (and assuming the voltage like OWL does) is intrinsically inaccurate.

    I use 500A 50mV shunted meters.


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