Impact of cracks in multicrystalline silicon solar cells on PV module power - A simulation study based on field data

Abstract

In this work we present a methodology to exploit the crack statistics of solar cells in PV modules assessed in field for simulating the power output of PV modules. The probability of crack and the type of crack depending on the position of the cell in the module are used to simulate a statistical distribution of modules constituted of cells represented by an extended two diodes model. The effect of crack resistance on the average performance of modules is determined and we show that cracks have a significative effect on module power when they show a resistance higher than 0.001 n. We compare the modelled resistances with resistances measured for cracks caused by mechanical loading tests. In the range of measured crack resistances, up to 5 to 10% of the modules lose up to 33% of their initial power.

Effect of micro cracks on photovoltaic output power: case study based on real time long term data measurements

“…When cracks appear in a solar cell, the parts separated from the cell might not be totally disconnected; however, the series resistance across the crack varies as a function of the distance between the cell parts and the number of cycles for which module is deformed [7]. However, when a cell part is fully isolated, the current decrease is proportional to the disconnected area [8, 9].…”

Visible defects detection based on UAV‐based inspection in large‐scale photovoltaic systems

“…The discoloration in PV modules appear after the PV installation for a number of years and reduces captured irradiance which directly degrades the output power generation. Cell cracks occur due to the mechanical stress sustained during module transportation and installation, and can also decrease output power of PV modules ([16, 17]). This study focuses on two widely available visible PV module defects, snail trails and dust shading, which bring direct adverse impact to the optimal operation of PV farms.…”

Snail Trails and Cell Microcrack Impact on PV Module Maximum Power and Energy Production

“…46 Köntges et al used fluorescence radiation to investigate mi-47 cro cracks in PV cells, in order to determine the number, the 48 position/orientation, and the frequency [13], [14]. Studies were 49 further carried out in [15], simulating the PV module power 50 affected by different crack types. The authors estimated that 51 cracks isolate a cell section leading to a module strings power 52 loss around 6-22%.…”