Thank you Peter! I think I would need to define the FTP and calculate by my own from there.. By the way, about Power 3S or 10S it is something I also had to implement or I can get that value straight forward?
may be 4 years later they finally added a get FTP or getpowerzones method? I just looked into Api documentation site and could not find anything yet, but I may not query the correct word.
