Strings, arrays, and sub-arrays: where PV installations go wrong
Most DC-side PV mistakes don’t start with bad cable or bad workmanship.They start with wrong classification. Strings, sub-arrays, arrays, and generators are electrical definitions — not marketing terms and not inverter features. If you get that wrong, every decision that follows (voltage, cables, protection, isolation, testing) is built on the wrong foundation. I’ve added a new classroom course: PV Strings, Arrays, and Sub-arrays This course covers: • What is actually a string, sub-array, array, and generator • Where voltage changes and where current changes • Why inverter topology does not define classification • Why DC-side non-compliances keep repeating on sites 👉 Click on “Classroom” above to start the course. This is the prerequisite for the next courses on conductors, protection, and DC-side compliance.