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BPLightlog
BPLightlogBest Answer
Super User
Apr 9, 2025 3:07 PM UTC

Hi, I presume you’re looking at the spike in the top screenshot for 9/4.

At the level of 145kW, that wouldn’t be possible via a domestic supply and you can see the spike at the same level each side of zero. (Domestic supplies are limited to 80 or 100A for single phase which equates to approx 23kW)

I would guess this is a glitch rather than a true surge which could be caused by the CT or data cable picking up an external emf signal. You should be able to confirm by looking at your energy input via your meter and account.

Bring me Sunshine ~ E&E {Solar PV, Battery Storage, EV, ASHP and Home Assistant automation}
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7 replies

BPLightlog
Super User
BPLightlogSuper UserBest Answer
Super User
Apr 9, 2025 3:07 PM UTC

Hi, I presume you’re looking at the spike in the top screenshot for 9/4.

At the level of 145kW, that wouldn’t be possible via a domestic supply and you can see the spike at the same level each side of zero. (Domestic supplies are limited to 80 or 100A for single phase which equates to approx 23kW)

I would guess this is a glitch rather than a true surge which could be caused by the CT or data cable picking up an external emf signal. You should be able to confirm by looking at your energy input via your meter and account.

Bring me Sunshine ~ E&E {Solar PV, Battery Storage, EV, ASHP and Home Assistant automation}
    Rank 2
    WhitwopAuthor
    Rank 2
    Apr 9, 2025 3:13 PM UTC

    Thank you for the reply. I presumed it was some form of glitch or we would have gone up in smoke! Any idea how we stop it? Thank you very much

      Peter E
      Super User
      Peter ESuper User
      Super User
      Apr 9, 2025 3:24 PM UTC

      As ​@BPLightlog said it has to be an instrumentation error either in the electronics or a processing error in the software. Suggest you contact the manufacturer to see if they have seen anything like this before. They might have a hardware fix or software update that can be applied.

       

      If it occurs infrequently and radomly it is highly unlikely the manufacturer will have an explanation or a fix for it. Is there a forum where you can ask other users of the system?

       

      Peter

       

      Reducing my yearly fossil fuel usage with an EV (-900 litres petrol saving about £950/year), A2AHP (-8,700 kWh gas, cost neutral) and Timed Immersion heater (-1,500 kWh gas, £20/year more expensive but reducing as the gas price goes up)
        BPLightlog
        Super User
        BPLightlogSuper User
        Super User
        Apr 9, 2025 3:24 PM UTC

        If it happens very infrequently it’s safe to ignore .. you can just check the position of the CT and cabling just to ensure they haven’t slipped. Ours look like this 

        You can see that the twin cable connecting to the CT doesn’t use twisted pair cable (twisted pair cable is often used in data connections to reduce external electrical noise). It is therefore susceptible to nearby pulses such as power tools or generators

        Bring me Sunshine ~ E&E {Solar PV, Battery Storage, EV, ASHP and Home Assistant automation}
          Peter E
          Super User
          Peter ESuper User
          Super User
          Apr 9, 2025 3:45 PM UTC

          Just checked historic lightning records for this morning and there is nothing recorded in the UK but it doesn't record everything.

          https://www.blitzortung.org/en/live_lightning_maps.php

           

          You can select historic data data and time and watch it on a loop over a period of time.

           

          Peter

           

           

          Reducing my yearly fossil fuel usage with an EV (-900 litres petrol saving about £950/year), A2AHP (-8,700 kWh gas, cost neutral) and Timed Immersion heater (-1,500 kWh gas, £20/year more expensive but reducing as the gas price goes up)
          Rank 2
          WhitwopAuthor
          Rank 2
          Apr 10, 2025 8:27 AM UTC

          Thanks for all the replies. It appears, as of just now, do be back to normal. It must have been 4 days of a glitch in the display. Thanks again

            Abby_OVO
            Community Manager
            Abby_OVO
            Community Manager
            Apr 11, 2025 7:07 AM UTC

            Hey ​@Whitwop 

             

            I’m glad to hear this! Hopefully it stays that way but do feel free to pop back any time if you’ve got any other questions.😊

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