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Average power discrepancy between Garmin Connect and Strava

FloP.
6 months ago

Ever since swapping to the Magene Powermeter, I'm experiencing the issue that the avg. power between Strava and Garmin Edge 830/Connect is quite different from the values shown in Strava.

I saw in other threads that you've quite a lot of knowledge about this topic. I had a look at the fit files. It seems that the accumulated power(watts) that are saved in the fit file are causing this issue. As they are higher than what I have calculated for the accumulation.

Is there any solution for this issue?

  • 0 6 months ago in reply to aweatherall

    I'll share the files with you later.

    I also think it's a problem from the power meter. Probably on the software site

  • 0 6 months ago in reply to FloP.

    try it via BT protocol, maybe only the ANT+ part is badly coded. 

  • 0 6 months ago in reply to Luko79

    This power meter is unusually. 

    Most power meters do actually transmit power data. They use the Crank Torque message and transmit torque and cadence, The Head units then computes power from this data.

    This power meter is using the Basic Power Message. This means that the power meter is transmitting cadence and a computed power value.

    eventCount: 128, pedalPowerPercent: 51, pedalDifferentiation: 1, cadence: 111, accumulatedPower: 63263, instantaneousPower: 830,

    You can try switching to BT, but the issue is with the power meter.

  • 0 6 months ago in reply to Luko79

    How can I link the PM with the Garmin via BT?

  • 0 6 months ago in reply to FloP.

    go into the sensor menu in the Edge , add sensor and search for power meters , the Edge should find it via BT also (via ANT+ it is already found and paired obviously), it supports both protocols

    is it the Magene P505, right? 

  • 0 6 months ago in reply to Luko79

    Yeah it is the magene p505, thanks I'll try this, maybe this works. 

  • 0 6 months ago in reply to FloP.

    and i forgot to write: temporarly disable the ANT+ version in the sensor menu to be sure that the BT version will be used during the activity (if both are paired , the ANT+ has higher priority in Garmins)  . you can identify the used protocol -> if the pmeter is alive, go into the sensor menu, find the paired powermeters , tap, go to details, and there 

  • 0 6 months ago in reply to aweatherall

    yes i know Alan its 99% Magene's firmware issue but before we say 100% sure let's give 1% chance :)  (i had experience in the past with different brand spider- based powermeter where the cadence was flawless via ANT+ but wrong via BT , later it was fixed with a new firmware ofc.)

  • 0 6 months ago in reply to Luko79

    Because just about all power meters use CF and not the basic message there could be an Edge side issue. The 830 is also an older unit so is not running the current software that the x40/x50 series Edge units are. Let me dig a bit deeper.

  • 0 6 months ago in reply to aweatherall

    Because just about all power meters use CF and not the basic message there could be an Edge side issue. The 830 is also an older unit so is not running the current software that the x40/x50 series Edge units are. Let me dig a bit deeper.