Measure multiple PV strings simultaneously
QCan I measure multiple PV strings for insulation resistance simultaneously using the IR4053, rather than one at a time?
No, in general when using the IR4053 Insulation Tester for photovoltaic or PV testing, only one string can be measured at a time.
When attempting to measure multiple PV strings at the same time, the effect of lightning protection devices such as a blocking diode or surge absorber may prevent you from measuring the insulation resistance. Please verify the design of the PV system.
If surge protective devices (SPD) such as surge absorbers are installed in the system or anywhere along the measured line, please remove them before measuring.