Hi. I have recently bought myself a Garmin Edge 530 and more recently a stages left only power meter. I had a couple of rides recorded with the HR strap only and the calorie's burnt seemed pretty standard.
a 2 hour, 45km ride burned 1750 calories. When I did the exact same ride with my power meter at a higher intensity, it says 980 calories burned. I calibrated and performed a zero reset on the PM before setting out for the ride.
What is the reason for this huge variance and what is more accurate to use? Is there a way to turn off the power meter for calorie burn calculator?