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Garmin saved lower power than it showed

Dear Garmin users,

I just performed 20 min. FTP test with Assioma Duo pedals paired with Edge 530. I kept Watts in 300-340 range, except for planned 120 seconds drop (where I didn't fall below 250W anyway).

After the test, I uploaded data to Trainingpeaks, and what I noticed is that power curve for these 20 mins constantly shows power about 20-30W lower from what I remember Garmin showed at the moment. As a result, 20 mins average was calculated as 292W, while my own guess after the test was 315. And I am pretty good in these post ride power assumptions, I mean I can get it wrong by 5 watts this or other way around, but never by 25!!!

Please, tell me if it's even possible that power saved in tcx file somehow got diminished from what my Edge showed.

Regards, and sorry for my English.

0 Kyle J over 3 years ago

Does Garmin Connect show the same?

0 2963200 over 3 years ago in reply to Kyle J

Good point Kyle - I checked it later on yesterday, and it showed 310W average for these particular 20 mins. At least I know I wasn't that weak:)

0 Kyle J over 3 years ago in reply to 2963200

Ok it sounds like Garmin recorded the correct power then, that's good news. I guess the problem is with TrainingPeaks.

0 Luko79 over 3 years ago

Dont You have tons of dropouts in the power signals? Did You do this FTP test indoor? It could be a possibility. Can You share a public link to your activity in Connect? (or share the FIT file /not the TCX!/ directly via file sharing service or similar)