Foil method for PID examination misguiding so one side of bifacial module is stressed

• Arise from PID cardiovascular test can be misguiding when bifacial PV modules are PID-stressed from simply one side making use of the aluminum foil technique in IEC TS 62804, according to a new study by Belgian researchers. An unintended electrical field arises between the non-stressed side of the cell and the based inside of the climate chamber, which might have the undesired result of creating added PID stress and anxiety.

Researchers from Belgium's Hasselt University and also the imec research center have revealed that applying the potential-induced deterioration (PID) stress and anxiety testing foil method to only explore one side of a bifacial PV module, without taking extra procedures, might result in the unwanted effect of added PID stress.

The foil-testing approach includes the application of high voltage in between the solar cell matrix and a conductive foil speaking to the glass surface area of the module, as managed by IEC TS 62804-1. It is thought about a legitimate testing tool if appropriately made use of, the researchers claimed. The method promotes surface area conductivity by using a light weight aluminum foil to the glass surface and frame of a solar module.

" When scientists perform PID experiments on only one side of bifacial PV modules, they should take additional actions and not thoughtlessly carry out experiments as if it were monofacial PV modules," scientist Jorne Carolus informed pv publication.

The researchers lately offered their searchings for in "Why and how to adjust PID screening for bifacial PV modules?", underway in Photovoltaics. They PID-tested 8 similar bifacial front junction (FJ) monocrystalline n-PERT solar cells packaged in various configurations. The PID examinations were performed according to the foil approach.

The experiment showed that the cells weakened suddenly on their non-stressed side when monofacial PID tension was put on bifacial PV modules.

" This issue can be resolved by replacing the soft drink lime glass cover with a PID-resistant cover at the non stressed out side," the scientists claimed. "However, it suggests that an unintended electric field emerges over the tool stack at the side which needs to not be PID worried."

They stated that an undesirable electrical area is formed between the solar cells (at -1,000 V) and the grounded inside of the weather chamber (at 0 V), which is frequently made of stainless-steel. "The electrical field triggers favorable charges to move towards the solar cell and also deteriorate its proper working principle," Carolus described.

The scientists suggested 3 steps that can be required to avoid undesirable, extra PID tension. These include shorting the non-stressed side of the glass/glass laminate with the solar cell via a light weight aluminum foil, making use of a drifting high-voltage resource, or changing the glass cover with a PID-resistant cover such as a backsheet on the non-stressed side.

Hasselt University and imec, in addition to Belgian study partners KU Leuven as well as Vito, are both partners in EnergyVille, a partnership in the fields of lasting energy and also smart energy systems.