It can be used to carry out risk assessments or for comparison of different design methods. Accelerated quantitative testing consists of tests designed to quantify the life characteristics of a product, component or system under normal conditions of utilization, and to provide information on determining the reliability of the system (probability of system failure under various conditions, life expectancy, average lifetime). High accelerated life test (HALT) provides various information about the product and its failure mechanisms. Īccelerated quantitative testing involves the estimation of product lifetime characteristics, obtained under normal conditions of utilization after an accelerated test. In qualitative accelerated testing, the expected result consists in identifying deficiencies and ways of failure without predicting the life of the product under normal conditions of utilization. Qualitative tests do not quantify the system’s life (or reliability) characteristics under normal conditions of utilization, but provide valuable information on the type and level of demands to use during a later quantitative test. Qualitative accelerated testing only provides information about system malfunctions or ways of failure. For the purpose of accurately determining the lifetime, it has been proposed an accelerate product testing (qualitatively or quantitatively during its lifetime). It is envisaged the modeling of the product’s lifetime, represented by the time it has worked successfully or its time until the moment of failure. On this basis, the quality of a product is determined, the reliability concept being applied in almost all areas of engineering, in the preventive maintenance of systems and their components. The reliability of a product can be defined as the probability of performing its tasks without incidents within a specified time, under previously established conditions. RBD diagrams have been developed for: (1) definition of PV systems, (2) description of interdependence between components, (3) identification of how they degrade/fail, and (4) appreciation of how the PV system reliability is influenced. The most relevant analyzes proposed by the authors in this paper are based on reliability block diagrams (RBDs) required for development of RAMS for studied PV systems.

To assess the reliability of the integrated PV system with LED lighting applications, its operating characteristics have been used for a time period, and in the case of the simple LED lighting system there were used thermal characteristics of the studied LED lamp. The authors proposed and carried out the reliability analysis of solar cells for specific meteorological conditions. Reliability analysis applies to both PV systems, and simple systems, such as LED-based lighting lamps. For this reason, a small part of the PV modules fails before the lifetime specified by the manufacturer. Starting from ground studies, the failures of PV systems have shown that manufacturers do not correctly perform reliability analysis of their PV modules’ lifetime. To overcome the reported inconveniences, it is envisaged the reliability analysis, using RAMS (Reliability, Availability, Maintainability, and Safety) statistical models through accelerated testing and application of stress levels.

A PV system for LED lighting applications has been analyzed. However, a reliability analysis is often missing from the feasibility study of photovoltaic systems or is treated superficially due to an incomplete methodological approach or lack of specific simulation tools. The reliability analysis also makes it possible to establish an acceptable maintenance plan for both the user and the system as efficiently as possible. In the case of grid-connected PV systems, the occurrence of system failures may affect the operation of other interconnected systems, that is why a thorough reliability analysis of such systems should be carried out.

This approach raises new and important issues related to the efficiency, reliability and safety of the PV systems, either autonomous or integrated in the electrical grid. Due to various incentive programs and local market conditions in several European countries, as well as around the world, the PV systems represent a widespread solution for residential houses and other autonomous applications.

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