Photovoltaic solar panel leakage case analysis

What causes small leakage currents in photovoltaic (PV) modules?

ABSTRACT: Small leakage currents flow between the frame and the active cell matrix in photovoltaic (PV) modules under normal operation conditions due to the not negligible electric conductivity of the module build-ing materials.

How does leakage current affect the performance of a solar cell?

A current is generated under this voltage stress, known as leakage current. Along with this leakage current, the availability of an adequate number of ions (i.e., Na+) on the solar cell surface leads to potential induced degradation (PID). This results in the degradation in the performance of a solar cell.

Does humidity affect leakage currents of PV modules?

Most of the reports reviewed for this study showed how atmospheric climate conditions, particularly humidity, affect leakage currents from modules. High humidity and presence of other moisture sources increase the level of leakage currents of PV modules. The humidity can have a significant impact on leakage current.

How does dust affect the leakage current of a PV module?

A slight amount of dust (2 g/m2) on the module surface was found to trigger the wet leakage current to a considerable limit. Tiny dust particles have a capability to attach with some ionic compounds, where Na ions are dominant from the coastal area that prompts the leakage current of the PV module.

Can a leakage voltage test be used to test a PV module?

Thus, the leakage voltage test is suitable for testing the insulation quality of exceedingly high number of PV modules. However, for highly accurate and precise results, wet leakage current test is still recommended.

Why are leakage currents a problem in a PvP system?

Leakage currents of PV modules lead to losses in the energy production of a PVP system. There are also added problems created by leakage currents such as safety risks, which are harmful to the PVP plant operators, to the PVP plant itself, and the distribution network.