HJ base station photovoltaic power supply failure

The degradation of photovoltaic (PV) systems is one of the key factors to address in order to reduce the cost of the electricity produced by increasing the operational lifetime of PV systems. To reduce the degradation, it is imperative to know the degradation and failure phenomena.

Most PV degradation mechanisms may lead to disastrous consequences, including human fatalities, when undetected or neglected. In terms of failure detection techniques, it was pointed out that these should be simple, applicable to most PV systems, cost-effective, accurate, and able to detect failures at low solar irradiance levels.

Furthermore, some PV failures, such as cell cracks, propagate rapidly [33, 34]; if undetected, they will cause a significant cost loss that may reach up to 10 times the equipment cost . This is because some undetected failures may lead to fire and catastrophic damage to the entire PV system .

Definition of PV Failure Photovoltaic failure is not defined uniformly in the literature. Some definitions indicate that a drop of 80% in maximum output power is considered a PV failure . Others claim a 20% drop in maximal power is a PV failure . Durand and Bowling defined failure as a drop of more than 50% in maximum power output.

To reduce the degradation, it is imperative to know the degradation and failure phenomena. This review article has been prepared to present an overview of the state-of-the-art knowledge on the reliability of PV modules.

In this period, there was a much stronger prevalence of defective interconnections in the module, and failures due to PV module glass breakage, burn marks on cells (10%), and encapsulant failure (9%) while failures due to junction-boxes and cables remained high.