Power Meters / Powermeters (SRM, Powertap, Quarq, Ergomo, Vector, Stages, power2max, P2M, 4iii, InPower, Cinch)

I have been pootling around in Provence for the past week, wearing my Powercal.

Here's a ride file for Ventoux- it was a fairly relaxed ascent, chatting away for most of it, however- given that I can't go up the hill I live on at anything below 250 watts and still maintain forward movement I suspect the Powercal data is a little conservative.

Once I've settled into an effort mine reads about 30w too low I reckon. Should test it against the P2M really. Could probably do that on the turbo via trainerroad. But similar trainng rides With each show a 30 ish watt difference.