My first plan is to use either the relay module to switch an automotive relay connected to a dedicated power supply that can push up to 40 amps with no issue. Since each compressor will be tested separately, I did not think it would push any harder than the current per one compressor being tested at a single time. After the first compressor test, the second set of relays would connect and power compressor #2. At the same time a central valve block with pressure sensor will be used to log the pressure and pressure hold to verify the compressor being tested passes test and hold pressure for 5 seconds before the last relay operates a pressure release valve on the compressor. There would be 4 relays per each compressor. One with 5v to "sense" a compressor plug is connected. The if true begin the relay to open valve with pressure sensor and start the compressor. After pressure and hold test for leaks, the last relay opens the release of pressure. The A1 would see the pressure back at 0 and all trials would be tested. Last part is a serial thermal printer would print the results to show proof of quality assurance.
Fingers crossed