I’m going to try swapping batteries and see if that makes a difference. I hope they offer to do something.
Mine is a pricey Campagnolo Stages. I’m a Campy guy and prefer an all campy bike but if I’m SOL with this I’m probably going to buy a Quarq or Power2Max.
Could also see if the firmware is up to date, in the stages app.
Conclusion - fixed!
I did a factory reset, installed a brand new Energizer battery, and ADC was 897.
It was weird that the old battery (also an Energizer) was being shown as having a full charge.
I guess when in doubt, install a fresh battery.
Anyone understand the math behind the temperature adjust that can explain how incorrect temperature will affect power reading?
For example, zero at 60 degrees in a cool garage and immediately go ride outside in 75 degrees. Will the meter be reading high or low?
I know it says it applied some different slope as a function of temperature, but I’m not sure how to interpret that in layman’s terms. Thanks
PMs use strain gauges to measure very small elongations in the metal. As you apply power the metal will stretch an imperceptible amount but enough to be measured. When the temperatures changes metal expands or contracts which I turn adds to or subtracts from the strain measurement therefore would not be consistent across a temperature range for a given calibration.
Thanks for your reply. This article by stages also satisfies any concern about doing a zero offset inside vs outside etc. in summary, there is no concern because the PM adjusts in real time to the temperature. I guess my legs just weren’t there on that last ride and it wasn’t the PM reading low!! Ha sad
Since I started this topic, I wanted to post the final solution. Through trial and error, I found that my Stages is battery sensitive.
I mean it likes fresh retail packs of name brand batteries (I’ve tried Duracell, Energizer, Panasonic) with success. It has to be the retail pack.
My Stages did not like cheapo, no name 10-20 packs off Amazon. It didn’t even like those “oem” Energizers off Amazon. Maybe fake? That was the battery that was giving me the bad ADC numbers.
I’m guessing that the Stages is voltage sensitive and needs the good stuff when it comes to batteries.