MegaSack DRAW - This year's winner is user - rgwb
We will be in touch
Since the latest update I've done two rides aiming for average 200w, with the HU reporting 190w by the end of the ride. Yet, the FIT file loaded to strava and TodaysPlan shows average 175w. On my phone the "Zero Watts" setting is off.
Whats going on?
I assume you're using a meter, right ?
Might the wahoo be extimating normalised power or something, and the fit file is a simple average ?
Average watts or normalised power?
Yes I'm using a 4iiii.
Uploaded FIT file: 175w average, 185w NP
HU/Wahoo on the phone: 190w average 185w NP
So the NP is the same but not the average watts - que?
Auto pause on the head unit?
maybe one copunts watts between, say, 1-50W and the other ignores anything below 50 ?
Auto pause on the head unit?
Yes - how does this change things?
Is the head unit calculating average power from the elapsed time from start and the fit file excluding any time autopaused?
I’ve noticed loads of discrepancies between different websites over the years. I don’t try not to let it bother me anymore. They all use different algorithms to calculate what you’d think would be a standardised metric such as average power. The normalised power is what’s used to calculate TSS so I wouldn’t worry.
Yeah thanks. Its more the fact I'm riding/aiming at 200w, using 5s power and on the Wahoo specifically the little LED's as above/below average indicators, so its annoying for the HU to indicate 190w then later download to see a 175w average. Its as though it actually hasn't taken the Autopauses out.
In some respects it doesn't matter as its "time in Z2" I'm recording for, but I would/should be aiming at the top of my Z2 power (215w) not the bottom end (170w). You can see then how the uploaded average is very close to the bottom of my Z2 power range when I really need it at the other end.
Edit" Aha. TodaysPlan had an option to reprocess the file excluding 0's, I did that and.... 189.78w. These aren't auto pauses, I can see its free wheeling taken into account.