Not a barb. An observation of an early adoption challenge (The old school environmentalists filling in for shortages of modern tech training) who get a bit over their head. It happens, as the waves of change wash over people in any abrupt change in technology. The new system needs teachers, and tries to draw from the "experienced" pool. In this case, someone familiar with building codes and project design teaching solar tech classes just didn't know how power electronics, inverters and some major components worked. From a 'git it done' installation standpoint, not critical. From a long term acceptance, reliability and confidence standpoint, I just don't feel that the installers should be completely dependent on device vendor support to respond to the customer (and ensure safety). Not knowing how black box components function can lead to carelessness or misplaced attention to the wrong details. Certification processes always have to evolve along the bumpy road of field experience, and eventually, more knowledgeable and experienced people become available. The rush to build is more often than not ahead of the people doing the actual building.