[MrForbes]

You can use the compressor, but have it "off board", ie not mounted to the robot. This way you can charge up the tank(s) with air pressure before a match, and not have to carry the compressor's weight on the robot. This only works for limited air use, such as shifting or running a small cylinder to do some infrequent task.

If you do this, you need two relief valves, one directly connected to the off-board compressor, and another on the robot plumbed to the storage tank side of the regulator.

(clarification welcome...this is just an example)