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Kamstrup Omnipower scale errors on some parameters (known to happen in Sweden and Denmark)

1 Comment
(5)
Posted on: 17-Jun-2024

Edit 9th Sep 2025: We've received information that the problem shows up on other parameters than wattage, and not only in Sweden. The content of the article has been modified to reflect this. 

Some Kamstrup Omnipower meters are now sending extra decimal(s) for some parameters. Unfortunately, the payload does not contain information on where to place the decimal point, so we cannot compensate for it in the firmware code.

The result of this is that the Pow-K device will display a 10x (ten times too much) or 100x (hundred times too much) error for the affected parameters.

We have so far seen:

  • 10x error on power in Sweden
  • 100x error on voltage in Denmark (one case on Bornholm)

As per 15th January -25, we are quite sure that not all Kamstrup Omnipower meters in Sweden are affected.

How to check if your meter is affected:

  • If your Pow-K is new, wait until the first passing of whole hour (in some configurations the meter sends Energy[kWh] only once per hour)
  • Go check the value shown on the LCD display on the meter.
  • The same value shall be shown under the power gauge on the main page:
  • If you see the same value - your meter is not affected by the kWh scaling issue.
  • If you under the gauge see a value that is ten times larger than the value on the meter LCD, keep reading.
  • Check also the voltage graph to see if the values are sensible (should be around 230V). If 10x or 100x wrong, you need to do adjustments (see below).

If your meter is affected, the fix is easy to implement:

  • Open the configuration page
  • In the "Meter" section: Activate Multipliers
  • Change the kWh multiplier from 1 to 0.1 (effectively dividing the value by ten)
  • Press "Save" (bottom right corner)

The setting should look like this:

You can correct voltage scale error correspondingly. 

Posted in: Information, How to

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Comments

  • Power through P1
    By: Mattias F On 16-May-2025
    Rating:
    5.0

    My net operator in Sweden says that the HAN on Kamstrup Omnipower delivers no voltage at all and that any module connected to P1 must use an external power source. Still I get the impression that the POW-K RJ12 works without any other power source than what the P1 delivers.

    If you could clarify this to that would be great and I will hit that buy-button

    regards
    Mattias

    Replied by: Egil Opsahl On 19-May-2025 Hej Mattias,

    Det din nettoperatør sier er for så vidt ikke feil. Om du anskaffer en Kamstrup HAN-P1 modul (https://www.kamstrup.com/se-se/product-centre/hanp1) så leverer den ikke 5V til RJ12 kontakten.
    Men med vår Pow-K behøver du ikke HAN-P1 modulen, og unngår derfor det problemet.
    Kort sagt: Den vil fungere som den skal på din Kamstrup Omnipower.

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