Product Briefing Outline: The Electrical Insulation Tester from Dr Schenk is a measurement solution for thin-film solar modules. It performs an electrical insulation test between the solar cells after scribing, and detects shorts and minimum resistance between neighboring cells.
Problem: In thin-film PV modules, the electric current flows between the solar cells, which are defined during laser scribing processes on the conductive layer (e.g. TCO or molybdenum). A discontinuity of these scribes will cause short circuits and minimum resistance between neighboring cells. Both situations can result in a loss of cell performance and thus an overall reduction of the performance of the solar module.
Solution: Dr. Schenk offers all-in-one quality assurance and process control systems for solar panel production. The SolarInspect surface inspection systems can now be combined with beneficial measurement tasks in just one solution for higher yield.
With the Electrical Insulation Tester from the SolarMeasure product line, shorts and minimum resistance between cells can reliably be detected. The Electrical Insulation tester’s main component is a measurement interface. A row of metal contact probes is installed along a contact bar. This board-like interface is easily installed on a frame and is placed horizontally above the solar modules flowing through the production line after scribing. The amount and distance of the lined-up contact probes depends on the size of the panel and, more importantly, on the number of cells – one probe for each cell. The modular design of the bar interface enables customers to easily exchange the contact bar for applications with different panel sizes. The measurement interface is connected to a controller box including a single board computer as well as a pneumatic system that lifts and lowers the contact bar for measurement. Modules with reduced performance quality can thus be rejected from further processing. At the same time, the system helps to draw conclusions regarding where parameters of the scribing process need adjustment.
Applications: Thin-film solar modules with a wide range of dimension and thickness. System is installed in-line after the P1 scribing.
Platform: The system is available as add-on to Dr. Schenk’s SolarInspect inspection systems or as a stand-alone product. The measurement cycle is max. 3 seconds.
Availability: Currently available.