Needed additional 3 phase power. I already had an ADX-20 phase converter but it wasn’t big enough to handle the additional load. I installed another ADX-20 rotary phase converter and it starts the new air compressor no problem. I hooked them in parallel and put phase monitors on the units. I also installed surge suppressors on each phase monitor. Worked with Jacob at American Rotary and he was great at answering my questions and didn’t get annoyed with my layman’s understanding of electricity. good experience. I wished I could have posted a video of the installation on YouTube but I not that fluent to get something of quality posted.