Power numbers don't add up in Isaac
Posted: Tue May 08, 2018 11:40 am
I observe the following stats for the inbound portion of a ride:
Why don't the average power numbers add up? Shouldn't the average power(89.4) = average Aero power (34.7) + average Rolling power (69.8) + average Gravity power (1.5)? The sum of the average power components (34.7 + 69.8 + 1.5 = 106) does not equal the average power (89.4). The speed at the beginning and end of the ride were both 0, so no power was converted to/from kinetic energy. The discrepancy is 16.6 watts.
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Distance: 11.10 mi (1:02:11)
Energy: 333.4 kJ
Cals Burn: 318.7 kcal
Climbing: 30 ft
Braking: -0.0 kJ (-0.0%)
Min Avg Max
Power 0 89.4 486 W
Aero 0 34.7 132 W
Rolling 0 69.8 100 W
Gravity -314 1.5 301 W
Speed 0.0 10.7 15.4 mi/h
Wind 0.0 10.8 19.7 mi/h
Elev 992 1054 1101 ft
Slope -6.0 0.04 7.0 %
Cadence 0 79.7 110 rpm