Power meters · Public discussion

CP V2 Power Profile

Started by peterwright · · Last activity · 4 posts · 1,059 views

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Power meters
Published
23 May 2006
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23 May 2006
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  1. Can someone tell me why the power profile in V2 uses AP and not NP for the 5 min & FT durations ?

  2. That question came up on the Wattage list and here's an explanation Andy gave for why AP was selected:

    Quoted post said:

    Given that power profiling isn't something you really need to do all
    that often, then a simple paper-and-pencil (or Excel-based) approach is
    (IMO) adequate, and give the flexibility to use whatever means you wish
    to define the value for the last column, i.e., functional threshold
    power. Implementing it in the software (as now has been done) does make
    life easier, though, and may encourage/allow some to gain better
    understanding than they had before. This approach, though, requires that
    you either 1) settle on a single way of defining the last column (e.g.,
    based on 60 min average power), or 2) introduce additional complexity
    into the code to provide the flexibility that the paper-and-pencil
    approach provides. Given the numerous other programming needs that had
    to be met, it was decided that #1 was a better option than #2. Maybe
    some day in the distant future there will be additional software
    "switches" that can be set to give the user more flexibility, but I
    think most everyone would agree that others things (e.g., quadrant
    analysis) come first.


    lists.topica.commessage.html

  3. frenchyge said:

    That question came up on the Wattage list and here's an explanation Andy gave for why AP was selected:

    lists.topica.commessage.html

    To which I would add:

    1) regardless of how the software operates, the last column should be viewed as simply "functional threshold power" (i.e., regardless of how you choose to estimate it).

    2) the reason that the 5 min column is based on average and not normalized power is that 5 min is too short for the normalized power algorithm to be completely trustworthy (even out at 60 min it seems to be good to "only" about +/-5%).

  4. acoggan said:

    2) the reason that the 5 min column is based on average and not normalized power is that 5 min is too short for the normalized power algorithm to be completely trustworthy (even out at 60 min it seems to be good to "only" about +/-5%).


    Is that something that's slated for improvement in the next version?? 😄

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