Team 1708 did this in Washington DC this year,
after our First regional we ended up dumping the compressor and the Clippard tanks, for some of the lighter PVC tanks so we could include a mini bot launcher on our robot. The way our system worked was like this, we had a onboard Spike and when the tanks needed charged (Between Matches) we plugged in the compressor to the spike, and ran the compressor off the robot's battery. You are allowed to do so, as long as you can prove that your compressor and code shut off at 120psi. after that was all said and done, we switched the robot's battery and were ready to rock and roll. This made being in the Finals interesting considering it took about 4 and a half minutes to fill the tanks; and we only had 6 minutes between matches
-1708