You know the problems – invisible damage from a recent hailstorm, defective bypass diodes, a sudden loss of output caused by the PID effect.
With pvVision – the electroluminescence investigation tool – in your toolkit, you will always be able to locate the source of the problem.
How electroluminescence investigation works
Sending a current through a solar module in a reverse direction causes the module to produce weak light emissions in the infrared region of the electromagnetic spectrum. You can photograph these emissions using a camera that has been specially modified for this purpose. As the percentage of infrared radiation emitted by sunlight is many times higher than the radiation from the solar cell, these investigations can only take place at night.
Although until recently electroluminescence testing was limited to the laboratory or to the solar cell and module production line, electroluminescence testing of solar modules in a solar installation is now possible. To do this, you use our pvServe system to apply a reverse current to an entire module string at night. You then photograph the solar modules with pvVision to diagnose many typical fault conditions.
Find any fault with pvVision
- Faulty (short-circuited) bypass diodes
- Micro-fissures in solar cells
- PID (Potential Induced Degradation)
- Contact problems with the front contacts of cells
You can also use pvVision to quickly diagnose the location of individual module strings. The pvVision camera kit ideally complements the pvServe service power supply and contains everything you need to carry out electroluminescence testing on PV arrays.
The kit contains
- A modified camera with a resolution of 18Mp
- An 8GB memory card
- A special fast IR lens
- An infrared pass filter
- Instructions including useful troubleshooting advice
- A practical rucksack to help you take the equipment onto difficult-to-access roofs
Another benefit: you can use the camera and zoom lens supplied with the pvVision set to take normal daylight photos – saving you the trouble of carrying a second camera.
- A torch with an IR beam to help with focussing at night
- A tripod
- All safely packed in a sturdy, water-tight carrying case
- wide angle adapter