Any product designed for the outdoor environment will be subjected to a variety of stresses over its lifetime. Various test standards address the need to simulate the outdoor environment in a controlled fashion to help determine a product’s ability to withstand a lifetime of harsh environmental exposure. Some common test inputs described in the solar module evaluation test methods are listed below. For all temperature & humidity test inputs, Westpak can test modules up to 3.6m in length.
Thermal Cycling - Rapid cycling of temperature between -40°C and +85°C (or +90°C) for 200 cycles at four to six hours per cycle. Tests for the ability to withstand thermal mismatch, fatigue, or other stresses caused by rapid, non-uniform, or repeated changes of temperature. Current injection is sometimes added to stress electrical junctions during thermal cycling.
Humidity Freeze Cycling - Rapid cycling of both temperature and humidity extremes. Similar to thermal cycling with high humidity. Typically ten 24-hour cycles are conducted. Determines the ability to withstand high temperature and high humidity followed by freezing temperatures.
Damp Heat Test - +85°C and 85% RH for 1000 hours. Tests for the ability to withstand the effects of long-term penetration of humidity. Longer or shorter test durations are also common. Changes in temperature or humidity levels are easily accommodated.
(65) Temperature & Humidity Environmental Chambers