1 Getting Started
2-50
precautions appropriate to the circumstances, following best PV/electrical safety
precautions.
WARNING The procedure described below is important but does not cover all situations; the
operator must assess the potential dangers of each PV system, and take appropriate
precautions.
FAILURE TO TAKE APPROPRIATE SAFETY PRECAUTIONS COULD LEAD
TO PERSONAL INJURY OR LOSS OF LIFE.
1. Isolate the PV module string to be tested (test string) from the inverter and from
other strings in the array. If the measurement is being made at a fused DC
combiner box, isolate the combiner box by means of a DC disconnect switch,
and isolate the PV strings from one another by pulling their fuses.
If the measurement is being made at a string inverter and the strings run directly
to the inverter, isolate the strings from one another by pulling their series fuses.
2. Press the button on the I-V Measurement Unit to disable the I-V sweep.
WARNING PV circuits continue to present danger of electrical shock while the system is paused.
FAILURE TO TAKE APPROPRIATE SAFETY PRECAUTIONS COULD LEAD
TO PERSONAL INJURY OR LOSS OF LIFE.
3. Following safe operating procedures, connect the PV leads of the I-V
Measurement Unit to the PV source to be measured. The connection can be
made at the PV module itself, or at the ends of home run cables, or at a
combiner box. If your strings run directly to the inverter, isolate them from one
another and from the inverter by pulling their fuses. Connect the Solmetric PVA
test leads to the string to be measured. In some cases, you can attach an alligator
clip to the fuse clip, using it as a test point.
Figure 28. Example of I-V Measurement Unit test leads clipped to the buss bars
of a PV combiner box
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