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High-voltage bias testing of PV modules is known to be useful for revealing design, material and process flaws in PV modules. It is accepted that the hot and humid climate under high-voltage bias imposes a severely harsh environment on the PV modules and enhances the possibility of degradation. Test location is, therefore, important. A test methodology is being presented here that can provide useful information for testing PV modules at high voltage in nature's own laboratory in a relatively short time frame.