New protocols determine solar cell failings during manufacturing

• 2 new pass/fail procedures are stated to be able to different cells which offer high hot-spot possibility, reveal high current leakage as well as demonstrate intermediate actions. The arranging method relies upon a hands-on solar simulator, an infrared cam as well as a tool to gauge seclusion.

Scientists from Spain's University of Malaga (UMA) insurance claim to have actually created 2 procedures which could be utilized in industrial solar cell production to identify feasible cell failures and also separate the tools worried.

The solar cell pass/fail procedures, which the scientists say could be executed in an industrial cell tester, work as a dimension device for 'dark screening'-- in which cells basically behave as diodes with an identical resistance; and for high-temperature reverse bias testing, in which the gadgets go through high voltage as well as temperature level stress.

One protocol has actually been defined for solar cells 125mm long and also with a 150mm diameter as well as the second issues 156mm lengthy cells with a 195mm size.

The methods are claimed to provide the choice of separating out cells which offer high hot-spot danger, reveal really high present leak and also demonstrate intermediate actions. In the case of hot-spot-based separation, the researchers stated, declined cells can be laser re-processed as well as, if that step comes along, utilized in PV modules for off-grid projects.

No shunt resistance

" Both procedures are based on voltage and also current dimensions without making use of ... shunt resistance (Rsh), which can not be provided by all industrial tools," stated the researchers. Research study co-author Maricruz López Escalantes informed pv publication that type of tools is "not able to determine ... resistance [in line with] standards."

The arranging technique relies upon a manual solar simulator, infrared cam and a tool made to determine isolation. The group took dimensions on 26,775 systems of the larger cell dimension as well as 58,139 smaller sized gadgets under dark and reverse conditions in an industrial solar simulator.

The examination resulted in around 0.49% of the cells being declined because of hot-spot risk and 0.28% as a result of current leak.

The UMA group produced two commercial PV components with the cells evaluated and sent them to Germany's TÜV Rheinland Energie und Umwelt Solar Energy Laboratory for screening. "This research laboratory performed the hot-spot endurance examination according to the IEC61215 ed.3 normative," the researchers specified. "Finally, the laboratory reports suggest that both PV modules [got rid of] the hot-spot aging test."

The methods are presented in the paper Shunt resistance criterion: Design as well as implementation for industrial silicon solar cell production, released in Solar Energy as well as on the ScienceDirect internet site.