3 Years to the day I first used a Emazys ApS Z200 PV tester on a commercial rooftop project. Since that date has been one of most helpful pieces of PV test equipment I own, and have identified the following on numerous occasions -Module PID through shunt resistance testing – Sub standard MC4 connections with high series resistance – location and quantum of Riso faults – Lower than expected Voc/Isc But equally importantly has helped verify 1000s of PV strings as “healthy’.

James Hoare

Electrical Engineer