It isn't about being able to solder components. It's about just how dangerous it is to work on high power circuits. High voltage makes it even worse. And the

It isn't about being able to solder components. It's about just how dangerous it is to work on high power circuits. High voltage makes it even worse. And then, you need specialized test equipment and fixtures. Source: I used to own a company where we designed manufactured high power DC brush and brushless motor controllers. As a simple example, every motor controller had to be tested for short circuit protection under full load. The power supplies alone were outside the realm of anything normal. The motor controller, power supply and storage capacitors had to be in a custom explosion-proof enclosure for the test.