How much difference between powersource is acceptable?

Thanks @GPLama ! I really appreciate that you replay on my topic.

I agree that the ERG mode workouts looks nice fit closely. What do you think of the Zwift race file? I think about to switch my Quarq in the winter from my racebike (i dont use it outdoor in winter) and rechange it back when i going ride more outdoor with the racebike.

you can do a static weight test on the Quarq to see if it’s reading ‘correctly’ at one point. If you don’t have a 10kg-20kg certified weight, using a set of accurate scales from a fishing shop (something with ~5g @ 20kg accuracy) and weighing something heavy and using that as your weight is a cheaper option.

My quarq is from 2015 and still i dont see big changes in numbers over years. It may be possible that the quarq measure a little to low, but when that is consistent i dont see any problem.