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Solar Guide Resistance Test

The document outlines the procedure for measuring the insulation resistance of solar panels while they are generating power, emphasizing the importance of using the Hioki IR4053 Insulation Tester to avoid damage. It details the steps to safely conduct the measurement, including disconnecting ground terminals and verifying insulation integrity. Additionally, it notes that specifications are subject to change and were valid as of September 2015.

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Robert R. Tiin
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58 views1 page

Solar Guide Resistance Test

The document outlines the procedure for measuring the insulation resistance of solar panels while they are generating power, emphasizing the importance of using the Hioki IR4053 Insulation Tester to avoid damage. It details the steps to safely conduct the measurement, including disconnecting ground terminals and verifying insulation integrity. Additionally, it notes that specifications are subject to change and were valid as of September 2015.

Uploaded by

Robert R. Tiin
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Construction / Power, Energy, Environment Service, Maintenance

Insulation Resistance Measurement of Solar Panels

Measure the insulation resistance of a solar cell panel that is generating power.
■ Highlights
• When measuring the insulation resistance of a solar panel that is generating electricity, remember
not to apply the standard method for measuring the circuit’s insulation resistance andbear in mind
that the photovoltaic cell voltage affects the test voltage and that there is the risk of damaging other
equipment if the array is grounded.
• The Hioki IR4053 Inslation Tester can accurately measure insulation resistance without being
affected by generating PV.
Solar String P

E
L

Insulation resistance meter INSULATION TESTER


IR4053

Photovoltaic array

Procedure of PV insulation resistance measurements


1. Open the output switch. If the input side is equipped with a surge absorber, remove the ground
terminals. If the N pole is grounded inside the DC circuit, disconnect it temporarily.

2. Connect the Insulation Tester IR4053’s E (earth) side to the ground terminal and the L (line)
side to the photovoltaic cell string’s P side.

3. Measure the resistance value at the P-side terminal, verify that there is no degradation in the
insulation, and then measure the N-side terminal. Be sure to measure the P side first and to verify
that there is no degradation in the insulation. If you find degradation, do not measure the N side.
Measuring the N-side terminal when the module has degraded insulation may cause the bypass
diode to reverse polarity, which will cause the simulation tester’s voltage to be applied directly to the
module.

4. After measurement is complete, return the surge absorber’s ground terminals to their
pre-measurement state without touching them directly with your hands.

5. Measure the voltage between P and E and between N and E using the Insulation tester IR4053’s
DCV range and verify that each value is less than or equal to the voltage between P and N.
Then restore operation, for example by reactivating the output switch.

Products used
INSULATION TESTER IR4053
Information valid as of September 2015. K0019-E02
Specifications are subject to change and revision without notice. September 2015

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