Operational sustainability in the field versus the laboratory: PV modules and insulation resistance

Published: May 1, 2015

By Jim Zhu, Wuxi Suntech Power Co., Ltd., Wuxi, China; Jeff Wang, Wuxi Suntech Power Co., Ltd., Wuxi, China

Poor insulation resistance in modules is one of the primary contributors to module failure. Regimes currently in place to test the insulation resistance of crystalline silicon modules have proved problematic, as the conditions found in a laboratory are not on a par with environmental conditions at installation sites. This paper explores the shortcomings of current testing standards and recommends further tests that should be introduced to prevent module failures in the field.

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