Contactless PV inspection
Danish PV Service have licensed technology from DTU where light is used to make solar cells luminescence for contactless inspection of PV modules. The aim is to identify and categorize faults already at an early state before it turns into powerloss. Using light to make the solar cells go into luminescence mode makes contactless inspection possible.
Contactless PV inspection
When a solar cell is pumped by a light source like a laser or LEDs it will reemit some of the energy as light between 1100 nm - 1200 nm. A camera sensitive to this region of the light spectrum can see this wavelengths and acquire a series of images which can be stitched together for a perfect luminescence image. This way contactless luminescence images can be acquired from PV panels. We call it LILI for Light Induced Luminescence Imaging.
LILI HANDHELD
The LILI Technology has been developed and proved through a series of research projects at DTU. The camera looks both inside the luminated line (photoluminescence - PL) and outside of the line (electroluminscence - EL) and images can be stitched together of the two modes respectively. LILI Technology therefore makes the best of both EL and PL giving an EL and PL image of the module in one go for post analysis.
.png)
LILI DRONE
The LILI technology can also be used mounted on a drone where a laser line is sweeping over the module while the camera is fixed towards the module. The technology currently have some years to the market to be fully mature. 2026 is set on the company roadmap to have a version ready for the market for premium customers.
LILI HANDHELD
Prototype
The current development level of the LIPI technology is a prototype of the handheld version, which is mounted on a tripod and can sweep the PV modules automatically. A market ready version for 2025 are currently being worked on.
