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.

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