EL vs. PL - Two paths to PV module quality inspection
EL vs. PL for PV modules: A concise comparison of daylight photoluminescence and electroluminescence for detecting microcracks, shunts, and degradation.
Solarzentrum Stuttgart for worldwide PV inspection & DaySy equipment
We, the Solarzentrum Stuttgart, have our roots in research at the University of Stuttgart. Worldwide PV inspection and EL/PL services, plus PV installation in the Stuttgart region. We support international clients with worldwide PV inspection, electroluminescence, photoluminescence and DaySy equipment, while providing PV installation in Stuttgart and the surrounding region.
Hail Inspektion: Learn more about our hail damage services!
Our services and products
Photovoltaic Inspection
We inspect your PV system for performance, installation defects and hidden faults.Damage recognition
Hail damage, transport damage, manufacturing or installation defects. With experience, performance measurement, thermal imaging and our patented DaySy EL process, we recognise even the smallest defects and can identify the cause.
Expert report
Our expert reports document the location, type and, if possible, the cause of the recognised defects. In the event of hail damage, our reports are covered by many insurance companies.
Electroluminescence by daylight
Our DaySy EL process allows us to inspect your PV system without the need for complicated set-ups during the day. While inspecting, we create high-resolution EL images of each PV module, which provide information about the degree of damage and its cause.
DaySy EL/PL Equipment
Buy or rent our high-performance DaySy measurement equipment for your own electroluminescence (EL) and photoluminescence (PL) inspections.Luminescence in daylight
Our patented DaySy process allows luminescence inspections of PV modules in their installed state in full daylight. Disassembly of the modules or complex setups and darkened containers are a matter of the past.
EL: Electroluminescence
For electroluminescence (EL), a power source energises individual modules or entire PV strings as required and the DaySy camera generates high-resolution EL defect images. Individual modules on delivery, entire strings on acceptance, random samples or even 100% inspection are imaged quickly and efficiently.
PL: Photoluminescence
With photoluminescence (PL) measurement, the necessary energy comes from the sun. A major advantage over EL is that no power source is required for the inspection. Our DaySy camera detects the same defects as EL, but some defect types are less pronounced.
Photovoltaic Installation
We install your customised photovoltaic system for your own home or company.Profound knowledge
Our experience as researchers and experts is the basis for your individualised PV system at the highest standard. Our view is always technical - ‘through engineering eyes’, so to speak - and we focus on high quality.
Installation conducted by our own personnel
From the initial consultation to the installation and commissioning of the PV system, we carry out every step ourselves with passion.
Company with a family-like atmosphere
We are a small, specialised team that collaborates closely on projects.
38,500
Inspected Modules
103
Installed PV systems
1821
Installed PV power [kWp]
Interested?
Please contact us if you are interested.
We will be happy to advise you!
Find out more about our activities in our blog
See all blog entries »Our blog contains various entries on the subject of photovoltaics. Take a look and find out more.
First Successful Drone Test Flights for EL & PL Inspection
From backyard tests to PV power plants: Solarzentrum Stuttgart has successfully completed the first drone test flights for electroluminescence (EL) and photoluminescence (PL) inspection under daylight conditions – including meaningful PL results during cloudy winter weather.
Hail Damage to Solar Systems – Detecting Invisible Damage
After a hailstorm, microcracks in PV modules may remain unnoticed – an electroluminescence inspection makes them visible.
Site Preparation for EL Inspection of PV Modules After Delivery
A guideline to prepare the site for a daylight EL inspection, ensuring an efficient workflow and having the site organised afterwards in the interests of the site owner.
EL inspection in Spain
Solarzentrum Stuttgart inspects modules after delivery at four 50 MWp PV sides in Spain.
PV System in the East of Stuttgart
The Solar Center ensures sustainable energy supply through the installation of a PV system in Stuttgart-East.
EL-Inspection in northern Germany
The Solarzentrum Stuttgart inspects a 1 MWp rooftop system in northern Germany.
DaySy Rover
Solarzentrum Stuttgart develops and tests the new fully automated daylight electroluminescence robot for inspecting ground-mounted systems.