A healthy cyclist might average 200-250w over an hour, or an FTP of 200-250. One horsepower is ~735w, so ~5kw for the 7hp compressor. The cyclist putting in a r

A healthy cyclist might average 200-250w over an hour, or an FTP of 200-250. One horsepower is ~735w, so ~5kw for the 7hp compressor. The cyclist putting in a really high degree of effort needs to pedal for 20x-25x as long as the compressor to do the same amount of work. A 7hp compressor delivers in the range of 1m3/min@6bar or roughly 35cfm@90psi. The output can vary a lot depending on how the compressor is optimized though. Air tool air use varies as well, a sand blaster or paint sprayer will have different needs. But an air tool like a disc sander or die grinder or air hammer or impact wrench will be in the 5cfm range or a little under .2m3/min. So for an hour of tool use the compressor needs to run for 8.5 minutes or 2 hours and 50 minutes of cycling.