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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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    • CommentAuthorowlman
    • CommentTime6 days ago
    I'm looking for an energy monitoring device that will track both my grid imports and my solar production, ( minus house base load ), do the maths and be able to produce historic records graphs etc., on my windows PC. I've spotted a couple, does anyone have experience of such devices.
    • CommentTime6 days ago edited
    Try the Open Energy Monitor site: https://openenergymonitor.org/ and then their shop https://shop.openenergymonitor.com/ once you understand what all the bits are.

    edit: Probably the best place to start is at https://guide.openenergymonitor.org/
    • CommentAuthorjms452
    • CommentTime6 days ago edited
    If you can still find them the 'Wattson solar plus' does exactly what you want as standard - used one for 7 years with no major issues.

    There is also an accessory called the Optiplug that turns things on when the excess power is sufficient to run them.

    • CommentAuthorRobL
    • CommentTime6 days ago
    We have had an 'ecoeye smart pv' for 3 years, no problems. Not as pretty as the watson I think, but very power efficient - lasted about 2 years on the first set of batteries. It records to a special(low voltage) sd card, and you can import from this to a pc.
    Would recommend Geo Solo II PV for both mains consumption and solar PV production if you don't have access to a smart meter. They work off the flashing LED from your existing meters, as opposed to the current clamp based monitors which can be inaccurate because of power factors/inductive/capacitive loads.

    The Geo's automatically log to the web, so if you want to do some further analysis then you will need to manually download CSV files.
    • CommentAuthorowlman
    • CommentTime5 days ago edited
    Thanks all:
    I'd looked at your suggestion Dave. It looks very professional but it's the best part of £200, so needs a bit of thought.

    I'd also spotted your "ecoeye" Rob, and much more keenly priced.


    John and Philip I was vaguely aware of the Wattson but not the Geo Solar so I guess a bit more research.
    I've got historic records for the Solar on my SMA inverter, but I'm about to buy a power diverter so the thought occurred that monitoring the whole lot in one graphical format may be a good idea.
    I've no idea how smart the new smart meters are, but maybe not as smart as what I'm after?
    • CommentTime5 days ago
    Posted By: owlmanI'd looked at your suggestion Dave. It looks very professional but it's the best part of £200

    True it may not be the cheapest option, but it is flexible enough to cope with a variety of situations. So it depends whether your situation matches one of the packaged solutions. In my case for example I want to measure (display & log) how much is diverted as well as how much is consumed and generated. I also have a car charging point that I'd like to be able to monitor if I ever start using it, and temperature readings from my thermal store etc.
    • CommentAuthorgravelld
    • CommentTime5 days ago
    I think the firm that made Wattson went bust didn't it? I've got one, integrates with Optimmersion, just works. Not sure how hackable it is, I think it's Arduino (Optimmersion certainly is, and I thought the two brands shared an original manufacturer).
    • CommentAuthorSprocket
    • CommentTime5 days ago
    Openenergymonitor is great and the staff at openenergymonitor.org are really helpful too.

    They can also integrate EV charging. We have a homebrew OpenEnergyMonitor setup (not using their hardware, just a Raspberry-Pi and some other bits) but we also have two OpenEVSE tethered wall chargers from them.
    I can't recommend them enough. They actually answer the phone and are happy to talk and exchange emails pretty promptly too.
    • CommentAuthorowlman
    • CommentTime4 days ago
    Thanks Sprocket, I agree they are very helpful; and djh. I see what you mean about "understanding all the bits" you sort of need some general grasp of monitoring/computer/internet/techno speak to figure it all out, I'm not sure I do, it's a steep learning curve.
    The site is full of computer age acronyms, and some simple explanations and typical fitting diagrams would be helpful, ( picture worth a thousand words etc..)
    The kit does seem good though.
    • CommentTime4 days ago
    FWIW, the OEM guys have my vote also. I've had the pleasure of working with them a (very) little.


    • CommentTime4 days ago
    Posted By: owlmanI see what you mean about "understanding all the bits" you sort of need some general grasp of monitoring/computer/internet/techno speak to figure it all out, I'm not sure I do, it's a steep learning curve.

    Apart from asking us here, the OEM forum is helpful.
    • CommentAuthorRobL
    • CommentTime1 day ago
    "Just for fun" I tried our ecoeye datacable -> PC, which is serial over usb, or can do straight serial for a lower power mbed/arduino/bbc microbit type embedded thing.
    The instructions were pretty simple, 19200 baud etc. I started up terraterm (I've used it for other stuff, there's lots of other ways to view serial data). Immediately I got:


    And that's all you get, every 4 seconds it updates, pretty simple. It represents the AC current consumed *100, AC current generated *100, both in Amps.
    It knows about power factor, but not the actual AC voltage, as it has a capacitive connection to a mains cable as well as 2 current clamps.

    I've never bothered with this before, as datalogging is simplest to the ecoeye sd card, and once a blue moon I transfer to PC with their bespoke software. I used to be interested in the nice graphs you get from it, but I find it hard to get anybody else in our house to care :-)
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