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electricity meter and monitor giving diff readings

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  • snowcat53
    snowcat53 Posts: 602 Forumite
    I had the same problem - monitor under-read by 50%. I was assured the tolerance is +/- 10% so I defintiely had a rogue one. Since they replaced it, it agrees well.

    What still puzzles me is how the background usage (when no major appliances is use ) varies.
  • victor2
    victor2 Posts: 8,103 Ambassador
    Part of the Furniture 1,000 Posts Name Dropper
    snowcat53 wrote: »
    I had the same problem - monitor under-read by 50%. I was assured the tolerance is +/- 10% so I defintiely had a rogue one. Since they replaced it, it agrees well.

    What still puzzles me is how the background usage (when no major appliances is use ) varies.

    My fridge is the biggest cause of variation in "background" use. The compressor cuts in every 20 minutes or so and the defrost heater, which is rated at 750W, cuts in about once every 10 hours to do its stuff.

    I’m a Forum Ambassador and I support the Forum Team on the In My Home MoneySaving, Energy and Techie Stuff boards. If you need any help on these boards, do let me know. Please note that Ambassadors are not moderators. Any posts you spot in breach of the Forum Rules should be reported via the report button, or by emailing forumteam@moneysavingexpert.com. 

    All views are my own and not the official line of MoneySavingExpert.

  • bondy01
    bondy01 Posts: 400 Forumite
    My efergy USB monitor reads 4-5% high. For instance for Jan it says 339 kwh whereas the meter says 322. I've dropped the default voltage to see if I can get it more accurate for this month. Presumably it works out kwh from sensing current and then multiplying by voltage. I don't consider that error to be bad but decided to have a tweak anyhow.
  • rogerblack
    rogerblack Posts: 9,446 Forumite
    If you have worked out what appliances consume a lot and which are low users, you have got all the value there is out of the monitor.

    Not solely.
    Having a rough idea of what the reading should be when you go to bed is helpful.
    In my case, if it's ~140W, I've left nothing extra on. (if it's 210, the fridge is on).

    This has probably saved me 10 quid or more this year. I have occasionally in the past accidentally left the garage lights on for a couple of weeks - 300W.
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