Welcome to AePVI

The smart inspection concept for any PV plant worldwide

We examine the quality of photovoltaic systems without dismantling.
Are the modules ok? Were they damaged during assembly? Are the yields too low?
Aerial PV inspection identifies and locates faults precisely.

We combine and automate classic and preventive inspections of solar power plants with image-based methods like thermography, electroluminescence and UV-fluorescence measurements, and with IV-curve recording by day and night, isolation issues detection, serial number scan, and geography data referencing.

To this end we employ tripod- and drone-based sensor systems, providing a cost-effective check-up by systematic sampling or 100% screening. EL measurements offer a comprehensive and exact assessment of faults on cell level and thus represent the tower of strength of the AePVI concept.


Electroluminescence analysis, thermography and combined measurements on-site by spezialised tripod- and UAV-systems


Inspection by remote-controlled measurement devices and power multiplexers such as AePVISwitch


Electroluminescence measurement without dismounting and transport of solar modules

100 % Screening

Complete electroluminescence measurements or systematic sampling with specialized UAV- and tripod-systems such as AirLabONE and AirBridgeONE


Measurements in one step: additional IV-curve-measurements by day and night, or isolation checks

High volume

Electroluminescence measurement and thermography for any PV-plant size worldwide, up to 1,000 images per hour

Images/ videos

Depending on request and failure type, featuring automated image analysis

Our work

Impressions of on-site inspections

Electroluminescence inspections

comprehensive - detailed - clear

Solar panels produce electricity during the day. If connected to a power supply in darkness, however, they emit radiation in the near-infrared light spectrum, which is not visible by the naked eye.

High-resolution electroluminescence (EL) images look similar to x-ray images. Active cells appear bright to grey, while inactive or damaged cells appear dark to black. The grey scale seen in the images allows to determine the cause and the amount of damage already on-site.

With this image-based qualitative measurements, damages caused by mechanical stresses such as transportation, installation, hail, snow can be quickly detected. Moreover deterioration, broken cells, interconnections and defective by-pass diodes can be recognized as well as malfunctioning panels and strings.

The evaluation of the images is automated and uses machine learning to categorise module faults.

Aerial EL testing is the most cost-efficient method currently on the market for the clear and early detection of solar systems affected by potential-induced degradation (PID).

This testing method can furthermore be used to verify the recovery of PID-affected systems. It also enables the reproduction of sytem documentation in case of false or missing string plans.


May 2024
Aepvi-news (27) - Interactive 3D digital twins
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April 2024
Aepvi-news (26) - Innovative AUTAGDRONE research project starts
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March 2024
Proposals for the standardisation of EL onsite measurements (1) - Camera angle
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February 2024
Aepvi news (25) - Expansion of partner network_South Africa
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January 2024
Limiting parameters for electroluminescence measurements (2) - ground conditions
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December 2023
Aepvi news (24) - Why EL commissioning tests are absolutely essential
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December 2023
Limiting parameters for electroluminescence measurements (1) - Low ambient temperature
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December 2023
Aepvi news (23) - Why EL commissioning tests are absolutely essential
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December 2023
"If you can't measure it, you can't manage it" (9) - EL solutions for no-fly zones
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December 2023
Aepvi news (22) - Benchmark EL multicam_tripod_platforms - 24,000 solar modules
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What our customers say

Contact us


Dr. Jan Schlipf

Managing Director



Andreas Fladung

Managing Director


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Aerial PV Inspection GmbH
HRB 21551, Aachen


+49 (0)241 990 3312


Im Johannistal 31a
52064 Aachen

© 2021