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  • FIRST POST
    • Rheumatoid
    • By Rheumatoid 3rd Oct 17, 1:29 PM
    • 375Posts
    • 1,141Thanks
    Rheumatoid
    Simple/cheap Import/ Export monitor
    • #1
    • 3rd Oct 17, 1:29 PM
    Simple/cheap Import/ Export monitor 3rd Oct 17 at 1:29 PM
    I can see my generation on my Geo solo II but it would be useful to see when I am importing or exporting. Is there such a thing or do the usual things just monitor flow of electricity and can't show you which way it is going?

    TIA
    R
    16 Panel (250W JASolar) 4kWp, facing 170 degrees, 40 degree slope, Solis Inverter, Geo Solo II Monitor. Installed 29/9/2015 - £4700 (Norfolk Solar Together Scheme)
    Year target (PVGIS-CMSAF) = 3880kWh - Installer estimate 3452 kWh; Year 1 Actual = 4152kWh; Year 2 Actual =4169
Page 1
    • The Green Hornet
    • By The Green Hornet 3rd Oct 17, 5:04 PM
    • 363 Posts
    • 599 Thanks
    The Green Hornet
    • #2
    • 3rd Oct 17, 5:04 PM
    • #2
    • 3rd Oct 17, 5:04 PM
    https://www.eco-eye.com/product-monitor-solar-smartpv

    https://www.eco-eye.com/energyhive-real-time-hub
    6 x Sharp 220 W panels. 1.32 kWp. SMA Sunny Boy 1200 inverter. South facing 30 degree pitch roof with no shading. Eco-eye SmartPV monitor + energyhive.
    • Rheumatoid
    • By Rheumatoid 3rd Oct 17, 5:46 PM
    • 375 Posts
    • 1,141 Thanks
    Rheumatoid
    • #3
    • 3rd Oct 17, 5:46 PM
    • #3
    • 3rd Oct 17, 5:46 PM
    thanks but was hoping for something a bit less than £80
    16 Panel (250W JASolar) 4kWp, facing 170 degrees, 40 degree slope, Solis Inverter, Geo Solo II Monitor. Installed 29/9/2015 - £4700 (Norfolk Solar Together Scheme)
    Year target (PVGIS-CMSAF) = 3880kWh - Installer estimate 3452 kWh; Year 1 Actual = 4152kWh; Year 2 Actual =4169
    • zeupater
    • By zeupater 3rd Oct 17, 10:16 PM
    • 3,817 Posts
    • 4,728 Thanks
    zeupater
    • #4
    • 3rd Oct 17, 10:16 PM
    • #4
    • 3rd Oct 17, 10:16 PM
    thanks but was hoping for something a bit less than £80
    Originally posted by Rheumatoid
    Hi

    If you have the ability to place the clamp sensor on the house feed then you'd be able to see load, so with 2 basic monitors you could see generation & load - so it just comes down to your mental arithmetic ...

    HTH
    Z
    "We are what we repeatedly do, excellence then is not an act, but a habit. " ...... Aristotle
    • Rheumatoid
    • By Rheumatoid 5th Oct 17, 10:36 AM
    • 375 Posts
    • 1,141 Thanks
    Rheumatoid
    • #5
    • 5th Oct 17, 10:36 AM
    • #5
    • 5th Oct 17, 10:36 AM
    Hi

    If you have the ability to place the clamp sensor on the house feed then you'd be able to see load, so with 2 basic monitors you could see generation & load - so it just comes down to your mental arithmetic ...

    HTH
    Z
    Originally posted by zeupater
    Thanks but would there not still be some degree of doubt as to what is showing on the clamp meter is coming in or going out? Or do they only ever measure what is coming in and would be at zero if its going out. Excuse my thickness
    16 Panel (250W JASolar) 4kWp, facing 170 degrees, 40 degree slope, Solis Inverter, Geo Solo II Monitor. Installed 29/9/2015 - £4700 (Norfolk Solar Together Scheme)
    Year target (PVGIS-CMSAF) = 3880kWh - Installer estimate 3452 kWh; Year 1 Actual = 4152kWh; Year 2 Actual =4169
    • zeupater
    • By zeupater 5th Oct 17, 7:45 PM
    • 3,817 Posts
    • 4,728 Thanks
    zeupater
    • #6
    • 5th Oct 17, 7:45 PM
    • #6
    • 5th Oct 17, 7:45 PM
    Thanks but would there not still be some degree of doubt as to what is showing on the clamp meter is coming in or going out? Or do they only ever measure what is coming in and would be at zero if its going out. Excuse my thickness
    Originally posted by Rheumatoid
    Hi

    It all depends on how your solar has been tied into the mains ...

    Ours is connected to it's own distribution box which is connected to the main feed via a Henley-block ...

    Meter --C-- HB ---A--- Fuse ------>House
    -------------|-----B--- Fuse ------ TGM ----- PV

    If you have this setup then clamps measure
    A - House load
    B - PV Gen
    C - Net Import/Export (but which direction not known)

    If not then you'll likely have C -or- B&C, in which case a clamp monitor system which can distinguish AC flow (like the one DaveF built!) or dedicated kit would be needed.

    HTH
    Z
    Last edited by zeupater; 05-10-2017 at 7:51 PM. Reason: layout
    "We are what we repeatedly do, excellence then is not an act, but a habit. " ...... Aristotle
    • Rheumatoid
    • By Rheumatoid 6th Oct 17, 2:31 PM
    • 375 Posts
    • 1,141 Thanks
    Rheumatoid
    • #7
    • 6th Oct 17, 2:31 PM
    • #7
    • 6th Oct 17, 2:31 PM
    Thanks but have no idea about that. all Greek to me
    16 Panel (250W JASolar) 4kWp, facing 170 degrees, 40 degree slope, Solis Inverter, Geo Solo II Monitor. Installed 29/9/2015 - £4700 (Norfolk Solar Together Scheme)
    Year target (PVGIS-CMSAF) = 3880kWh - Installer estimate 3452 kWh; Year 1 Actual = 4152kWh; Year 2 Actual =4169
    • michaels
    • By michaels 6th Oct 17, 3:38 PM
    • 19,953 Posts
    • 91,534 Thanks
    michaels
    • #8
    • 6th Oct 17, 3:38 PM
    • #8
    • 6th Oct 17, 3:38 PM
    So our mains comes in, through the meter then split to two consumer units, one is the 'original house', the other is the garage. The garage one then has the PV connected.

    So we can measure what the original house consumer unit uses and what the garage plus pv unit uses but of course we don't know the breakdown by direction of the flow between the garage and the junction next to the import meter is.
    Cool heads and compromise
    • ard123en
    • By ard123en 16th Oct 17, 4:45 PM
    • 228 Posts
    • 92 Thanks
    ard123en
    • #9
    • 16th Oct 17, 4:45 PM
    • #9
    • 16th Oct 17, 4:45 PM
    I'm working on this at the moment plan to use 2 clamps one on the solar inverter the other an the house feed

    Then use an adrino or raspberry pi to do the calc and output to a web page
    • gefnew
    • By gefnew 16th Oct 17, 7:51 PM
    • 71 Posts
    • 76 Thanks
    gefnew
    hi
    If you have a henley block use to owl meters very cheap.
    was free years ago from your leccy supplier.
    Fit one to the solar feed and one to leccy in feed.
    regards
    gefnew
    • gefnew
    • By gefnew 16th Oct 17, 7:53 PM
    • 71 Posts
    • 76 Thanks
    gefnew
    Hi
    Or search for Dave Fowler he has a mdified version of the owl that does both.
    regards
    gefnew
    • Dave Fowler
    • By Dave Fowler 16th Oct 17, 10:47 PM
    • 451 Posts
    • 797 Thanks
    Dave Fowler
    Hi
    Or search for Dave Fowler he has a mdified version of the owl that does both.
    regards
    gefnew
    Originally posted by gefnew
    I'll be happy to help anyone who has an aptitude to build a simple electronic circuit on a piece of Veroboard.

    Dave F
    Solar PV System 1: 2.96kWp South+8 degrees. Roof 38 degrees. 'Normal' system
    Solar PV System 2: 3.00kWp South-4 degrees. Roof 28 degrees. SolarEdge system
    EV car
    Location: Bedfordshire
    • DREKLY
    • By DREKLY 18th Oct 17, 8:42 AM
    • 141 Posts
    • 109 Thanks
    DREKLY
    yes please, can you post up circuit diagram/schematic, thanks Dave !
    16 x Enhance 250w panels + SolarEdge Inverter + TREES
    • ard123en
    • By ard123en 31st Oct 17, 2:20 PM
    • 228 Posts
    • 92 Thanks
    ard123en
    Just been reading this and thought of this thread.

    https://learn.openenergymonitor.org/electricity-monitoring/ct-sensors/installation

    Like most geeks have most of this stuff kicking around but can be bought for about £10 on AliExpress
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