This summer i completed an ironman, during the bike section i was tracking my power from my Vector pedals on both my Fenix 5 watch (Multisport activity) and my Garmin Edge 130 cycle computer.
This summer i completed an ironman, during the bike section i was tracking my power from my Vector pedals on both my Fenix 5 watch (Multisport activity) and my Garmin Edge 130 cycle computer.
Do you have the FIT files for the activities?
No obvious way to attach them in this reply so dumped them online here:
Edge: https://ufile.io/n231sfkm
Watch: https://ufile.io/ubos75x2
The only reason I can think is of is that you are using different communication protocols on the 2 devices and the BLE protocol does not handle the switching to coasting as well as the ANT protocol so tends to accumulate more power.
F5 paired over BLE
Edge 130 paired over ANT
I would recommend change the F5 to pair to the power meter over ANT and not BLE.
Make sure that both devices handle periods with zero power identical when it comes to averaging things. This explains things: https://support.garmin.com/en-ZA/?faq=gsrfToujiH6PwvWWSGx8q5.
If you truly want to get to the bottom of this it might be worth uploading the FIT files to DC Rainmaker's Analyzer (https://www.dcrainmaker.com/analyzer).