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  • RenewSys India

Humidity Freeze Test

What is the test?

The purpose of this test is to determine the ability of the PV module to withstand humidity penetration at extreme temperatures. It may be considered as a combination of two other tests - Damp Heat and Thermal Cycling.



Environmental Chamber at RenewSys Facility test modules up to 3 times IEC


Why is this test conducted?

To determine the ability of the module to withstand the effects of High Temperature and Humidity followed by Sub-Zero Temperatures.


How is it conducted?

The Humidity Freeze test as per the IEC 61215 standards, follows the step-wise procedure listed below:


  • Attach a suitable temperature sensor to the front or back surface of the module(s) near the middle. If more than one module of the same type is tested simultaneously, it will suffice to monitor the temperature of one representative sample.

  • Install the module(s) at room temperature in the climatic chamber.

  • Connect the temperature-monitoring equipment to the temperature sensor(s). Connect each module to the appropriate current supply by connecting the positive terminal of the module to the positive terminal of the power supply and the second terminal accordingly. During the humidity freeze test set the continuous current flow to no more than 0.5% of the measured STC peak power current.

  • Record the module temperature throughout the test, and monitor the current and voltage through the module.


Test Conditions


  • Temp Range : - 40 ⁰C to +85 ⁰C ±2

  • Rate of change of temp : <100 ⁰C/h

  • Dwell time at -40 ⁰C : > 30 mins

  • Dwell time at +85 ⁰C : > 20 hours

  • Humidity : 85% ±5% @ +85 ⁰C

  • No. of cycles : 10

  • Cycle time : 24 hrs for each cycle





Defects noticed in a module that fails this test:


  • Delamination of Encapsulant and Backsheet

  • Backsheet Cracking

  • Failure in edge sealing

  • Corrosion at the front surface interconnects


Image Credits: RenewSys

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