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    • MattHaslam
    • By MattHaslam 16th Apr 18, 6:43 PM
    • 3Posts
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    MattHaslam
    I think I have a faulty electricity meter?
    • #1
    • 16th Apr 18, 6:43 PM
    I think I have a faulty electricity meter? 16th Apr 18 at 6:43 PM
    Hi all,
    After a series of seemingly high electricity bills I am started by to think my electric meter is faulty. I noticed that the imp/kWh light still flashes whilst my main fuse breaker and consumer using breaker is completely switched off. When I told my supplier EDF energy about this, one person claimed that this light was only an indication of an active power supply and bears no correlation to the amount of power being consumed??? I explained how the light gets faster then high current appliances are on was told that this was coincidental!

    My other reason to question the meter is that whilst on holiday last week over a 7 day period my meter clocked up 121kwh! The only things left powered on was an under counter fridge, a table top freezer, 2 x 12v CCTV cameras and a low power Mac mini (to record cameras). This seems alarmingly high.

    Iím fairly sure that the meter is faulty but talking to EDF is just making me question myself, espoecially as they will charge £80 upfront for the meter to be tested and only refund if itís found to be faulty which only happens Ďvery rarelyí.
Page 1
    • Hengus
    • By Hengus 16th Apr 18, 6:53 PM
    • 6,084 Posts
    • 3,873 Thanks
    Hengus
    • #2
    • 16th Apr 18, 6:53 PM
    • #2
    • 16th Apr 18, 6:53 PM

    Iím fairly sure that the meter is faulty but talking to EDF is just making me question myself, espoecially as they will charge £80 upfront for the meter to be tested and only refund if itís found to be faulty which only happens Ďvery rarelyí.
    Originally posted by MattHaslam
    Hi - welcome to the forum. I think that you have your answer. If suppliers carried out free meter checks every time that someone questioned their usage then the cost to all of us would be huge.

    You should try turning everything off for an hour and then check whether your meter reading has increased. If you then believe that you have a faulty meter, then what have you got to lose? If meter is found to be faulty then there will be no charge, and your usage will be re-assessed.
    • MattHaslam
    • By MattHaslam 16th Apr 18, 7:36 PM
    • 3 Posts
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    MattHaslam
    • #3
    • 16th Apr 18, 7:36 PM
    • #3
    • 16th Apr 18, 7:36 PM
    Thanks for the reply,
    Whilst the power was turned off when I first noticed the light still blinking, the number of units did increase by one but was within a minute of me turning the power off. A couple of friends have said that the meter may have a delayed update on it and that the meter may not have clocked up while the power was off?
    • Hengus
    • By Hengus 16th Apr 18, 7:49 PM
    • 6,084 Posts
    • 3,873 Thanks
    Hengus
    • #4
    • 16th Apr 18, 7:49 PM
    • #4
    • 16th Apr 18, 7:49 PM
    Thanks for the reply,
    Whilst the power was turned off when I first noticed the light still blinking, the number of units did increase by one but was within a minute of me turning the power off. A couple of friends have said that the meter may have a delayed update on it and that the meter may not have clocked up while the power was off?
    Originally posted by MattHaslam
    Thatís a new on me. Normally, when the LED flashes there is a current flow. If you turn everything off the LED should stop flashing.

    For example, the label on the meter states 1000 Imp/kWh, so the LED will flash 1000 times per unit of electricity. We can use that value of 1000 to estimate the power. If a constant 1000W (1kW) is going through the meter, then in one hour (3600 seconds) the LED will flash 1000 times, so the LED will flash once every 3600/1000 = 3.6 seconds. With a constant 3000W (3kW) going through the meter, in one hour 3 kWh will pass through the meter (3 x 1000 = 3000 flashes in 3600 seconds) so the LED will flash every 3600 / 3000 = 1.2 seconds.

    It is more likely that you will want to measure the rate of flashing, and from that calculate the power going through the meter. This can easily be achieved by reversing the calculation above as follows:
    Power (kW) = 3600 (secs in 1hr) divided by (the seconds between flashes * number of Imp/kWh printed on meter)

    The most likely reason for the occasional flash is something on, or left on, that you have not noticed. For example, a BB router; Sky box etc. Turn everything off at the mains switch then your meter reading should not increase whatever the LED is or is not doing.
    • MattHaslam
    • By MattHaslam 16th Apr 18, 8:16 PM
    • 3 Posts
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    MattHaslam
    • #5
    • 16th Apr 18, 8:16 PM
    • #5
    • 16th Apr 18, 8:16 PM
    Thanks, thatís always been my understanding too, and when Iíve noticed the flashing, the main breaker prior to the consumer unit has been off so nothing in the house was on, yet the led still flashed and the number went up.
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