power2max problem - high readings

Discuss light weight issues concerning road bikes & parts.
wwnick
Posts: 106
Joined: Wed May 10, 2017 8:49 pm

by wwnick

yes, left/right balance numbers appear OK, the same as they did when I was getting correct figures last week

jesmol
Posts: 2
Joined: Fri Jul 28, 2017 2:43 am

by jesmol

I have this happening on my P2M at the moment, battery is reading around 2.9v to 2.8V according to IPsensorman. I'll try changing it over an see how it goes.

I also noted that I also have some corrosion on the battery terminal

by Weenie


jesmol
Posts: 2
Joined: Fri Jul 28, 2017 2:43 am

by jesmol

New battery and the power reporting appears to be more correct

wwnick
Posts: 106
Joined: Wed May 10, 2017 8:49 pm

by wwnick

yes, that is what happened to me also. i plan to replace battery every 3 months (3-4000km) now to avoid this.

tl8nicol
Posts: 29
Joined: Wed Jan 09, 2008 8:10 pm
Location: Brazil

by tl8nicol

I had a type S for almost 2 years and a cack started to build from the battery compartment. I sent the unit to P2M and they said it was over-torque. I was not happy with that because I know I haven't overtorqued it, and also because their battery compartment screw is a really bad design ("screw with 2 fingers").

Anyway, they offered a crash replacement and I got the new NG.

But now there is another problem:
1) Every time I calibrate before my rides it says "error". After 8-10 attempts I finally get a "calibration successful".
2) Almost every ride I got these high power spikes ranging from 13,000W to even 25,000W. This is clearly some interference, as the unit doen't work above 2,000, 3,000W...
The problem is that it ruins my iF and my NP, and for the type of workouts I do, I really use those parameters. This during workout.
After uploading to Garmin Connect, the power curve is like a line in with a crazi peak in the middle. All parameters are off.
Strava doesn't seem to get this spikes, though

Any thought on how to prevent this from happening, or how to set a limit on my Garmin 810? Or in the Garmin app?

Thank!
<><

AndreLM
Posts: 291
Joined: Tue Feb 05, 2013 11:53 pm

by AndreLM

1) I get the same with my NGEco. My solution is to calibrate with the cranks parallel to the ground and press the calibrate button while the bike is leaning on something fixed (like a wall). Everytime I try to calibrate when holding the bike with my hands or legs I get that error
2) it happens sometimes with me as well, with both TypeS and NGEco. I fixed it in GoldenChettah (where I do all my analyzis). I could re-upload it to Garmin Connect or Strava, but I really don't bother... I think TP recognizes as an anomaly and fixes it automatically.

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TonyM
Posts: 2507
Joined: Thu Jan 22, 2015 4:11 pm

by TonyM

Why do you calibrate it manually as it does it automatically during your ride (as soon as you stop pedalling 3 seconds I think)?

Boshk
Posts: 279
Joined: Wed Jul 19, 2017 2:59 am

by Boshk

I think this is the first time I've heard p2m problems, hope you guys get it sorted.
Colnago C60

mrlobber
Posts: 679
Joined: Sat Oct 23, 2010 9:36 am
Location: Where the permanent autumn is

by mrlobber

tl8nicol wrote:
Thu Jul 19, 2018 9:40 pm

2) Almost every ride I got these high power spikes ranging from 13,000W to even 25,000W. This is clearly some interference, as the unit doen't work above 2,000, 3,000W...
The problem is that it ruins my iF and my NP, and for the type of workouts I do, I really use those parameters. This during workout.
After uploading to Garmin Connect, the power curve is like a line in with a crazi peak in the middle. All parameters are off.
Strava doesn't seem to get this spikes, though

Any thought on how to prevent this from happening, or how to set a limit on my Garmin 810? Or in the Garmin app?

Thank!
Have the same problem with my NG, except that spikes are in 2000-5000W range.
Sent the fit files to P2M for investigation, their reply was that these are associated with Garmin head units micro loss of signal from the the power meter, which leads Garmin to "fill" the missing data with weird values. They pointed me to the fact that at the power spikes, no cadence was available and also HR did have values with decimal points (ANT+ theoretically doesn't allow transmitting non-integer data)

They recommended disabling Torque and Pedal Smoothness data in P2M app - if only power, cadence and L/R balance would be available (as in Type-S powermeters, where I've not observed any spikes with multiple units), they say, the likeliness of spikes would decrease significantly:
P2M support wrote: It's a combination of bad antenna performance of the Garmin units and less redundancy in transmitted data from the NG caused by more different cycling data - pedal smoothness, torque etc
Haven't tried that yet, though.

Monkeyfudger
Posts: 102
Joined: Thu Apr 11, 2013 7:26 pm

by Monkeyfudger

If you’ve had 2 different PM’s with the same head unit but still have issues my bet isn’t on the PM...

AndreLM
Posts: 291
Joined: Tue Feb 05, 2013 11:53 pm

by AndreLM

To be fair it happened only 3 or 4 times total between the 2 of them, and I fully agree that my Garmin is most likely the culprit here.

As I said... it really doesn’t bother me as GoldenCheetah can easily identify these anomalies and normalizes it.

It also makes some cool pictures :-)

Image

fogman
Posts: 788
Joined: Fri Oct 30, 2009 10:36 pm

by fogman

Are those power spikes there when you upload your data? I was thinking perhaps those power spikes are on the display unit only.


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It's all downhill from here, except for the uphills.

AndreLM
Posts: 291
Joined: Tue Feb 05, 2013 11:53 pm

by AndreLM

Yep. They show up in the screen and also in the FIT data. Some services (don’t remember which... TP, Strava or Garmin Connect) finds and automatically corrects them when they show the summary, NP, etc

jhalmar
Posts: 26
Joined: Sat Aug 24, 2013 5:11 am

by jhalmar

My Quarq Dzero had spikes with Garmin 810 almost on every ride and after switching to Wahoo Bolt zero issues.

by Weenie


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