Insulation Resistance Measurements for Solar Cell Array
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There are two insulation resistance measurements for solar cell
arrays. Characteristics of them are as follows:
1．Measurement with P-N opened
PVΩ measurement of this manual is explained with this mea-
surement.
As solar cell voltage influences the test voltage, the measure-
ment may not be accurate. Incorrect procedure may damage the
solar panel.
If earth fault is occurred due to earth leakage as shown in the
following figure, current being generated influences the insula-
tion resistance meter resulting in inaccurate measurement with a
normal insulation resistance meter. PV
Ω measurement mode of
the IR4053 allows accurate measurements without the effect
from power generation.
2．Measurement with P-N shorted
This measurement allows accurate measurements but is also a
highly dangerous method as arc discharge may be generated
due to the short circuit. There is also a fire risk depending on the
deterioration level of the solar panel.
Insulation Resistance Measurements for Solar Cell
Array
Connection box
Earth
Earth
leakage
PV current
Insulation resistance
meter current reading
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