We help our customers to achieve the highest degree of measurement certainty and getting the highest return from their solar investments. Our test setups address the specific needs of technologies like PERC, IBC, HJT, Perovskite, CdTe and are fully capable of handling of bifacial, half-cut cell, shingled and large modules.
We are Eternal Sun.
We wake up every day to assure the world of solar performance. We build high-end simulators that make sunlight. We also provide inspection and testing services in the global solar supply chain. And with solar being well on it’s way to become the world’s leading energy source, we believe that certainty is needed. In the end, nobody likes to waste energy. We are sure about solar. We’d like you to be too.
Assure the world of solar performance.
We did it with the Nuna 4 Solar Car.
We do it with our industry leading flashers and light soakers.
We do it with our solar inspection and test services.
We do it for the world’s best research labs.
We do it for the world’s leading solar module producers.
We do it for solar power producers around the world.
We do it with our industry leading flashers and light soakers.
We do it with our solar inspection and test services.
We do it for the world’s best research labs.
We do it for the world’s leading solar module producers.
We do it for solar power producers around the world.
Our products
Solar Simulators
- A+A+A+ steady-state solar simulator
- Wide and tunable spectrum for tandem matching
- Adjustable irradiance
- 15°C – 85°C temperature contol
- A+A+A+ class illumination according to IEC 60904-9 ed. 3
- Xenon Single Longe Pulse 270ms
- Wide spectrum 300-1200nm
- Stable and uniform temperature control from 10°C to 85 °C
- 2,6 m x 1,4 m test area
- A+A+A+ class illumination according to IEC 60904-9 ed. 3
- Xenon Single Longe Pulse >110ms
- Wide spectrum 300-1200nm
- Market-leading repeatability and reproducibility
- 2,6 m x 1,4 m test area
- AAA+ class steady-state illumination according to IEC 60904-9 ed. 3
- Wide spectrumm 300-1200nm
- Insitu IV measuremetns
- Customizable size
- Perovskite and tandem PV testing
- AAA+ class steady-state illumination according to IEC 60904-9 ed. 3
- Spectrum range 300-1200nm
- Insitu IV measurements
- Stable and uniform temperature control from -10ºC to 95ºC
- Custimizable size
- Perovskite and tandem PV testing
We don’t go light on promises.
Applications for our products
Accurate and repeatable power measurements
One thing’s for sure. Solar energy is here to stay.
“We don’t exactly know where solar is going, but we know we’ll make it work.”
Stefan Roest, founder and CTO
Stefan Roest, founder and CTO
Here you can read about what’s happening lately
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10 August 2023Join our Webinar on Measuring Power & Stability of Perovskite and Tandem PV Modules
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25 July 2023Eternal Sun introduces the next generation LED steady state solar simulator
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26 April 2022Meet us at Intersolar Europe
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5 October 2021Eternalsun Spire tests Vattenfall’s Solar Team’s car for the Solar Challenge Morocco
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6 September 2021EU PVSEC 2021: >25.000 modules import tested for Europe
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29 April 2021Webinar | How to test bifacial modules according to the new IEC 61215:2021?
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1 April 2021Webinar | UV degradation of PV modules: why and how to test?
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22 March 2021Webinar | Impact of Large size, 600+ modules on Testing and Quality Control
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16 March 2021Join us at PV Heterojunction Tech!
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Do you want to learn more? Contact us!
Eternal Sun is a leading manufacturer of solar simulators for measuring the performance and reliability of PV modules. We provide PV import testing in the ports of Rotterdam and Valencia and Factory Inspections in China and South-East Asia.