About us

Eternal Sun Group is a leading PV module testing company. The company consists of Eternal Sun BV which aims at innovative steady state solar simulation solutions for the R&D and certification market and of Spire Solar LLC which aims at the PV module manufacturing market. The two companies address different markets, and together are able to offer quality control, insight and confidence across the entire solar industry.


What we believe in

Solar is the most economical way to generate electricity in ‘sunbelt’ countries, and will be so all across the globe in the coming decades. Therefore, in energy investments, solar will be dominant.
There are two large trends: First, a race down the experience curve drives efforts in R&D and module manufacturing to enable the maximum potential of solar modules and second: the downstream market is maturing. To cope with the margin pressure, knowledge on performance degradation will gain importance.

What we do

We contribute to the development and growth of the solar industry by enabling the highest degree of measurement control and certainty by providing high-end solar testing advice, technology & services.

What excites us

Eternal Sun Group believes in the potential of solar and the potential of technical students, therefore we sponsor the two solar related raceteams of the Delft University of Technology: The Nuon Solar Team, famous for winning the World Solar Challenge in Australia 5 times and the Delft University of Technology Solar Boat Team which is competing in the Solar Boat World Cup and the Solar1 Monte Carlo Cup (Monaco) this year. Part of this sponsorship is helping them to improve the performance of their solar racing equipment with advanced solar simulation equipment and specialized testing services. The subsequent aim is showing the world the possibilities of advanced technology and solar power and inspiring people to strive for a more sustainable future.


The ‘NUNA’ solar car of the TU Delft Nuon Solar Team.

Dutch TU Delft Solar Boat Team

The boat of the TU Delft Solar Boat Team in action during last world cup in the Netherlands

ISO 9001

Since the establishment, Eternal Sun Group has followed distinct procedures to guarantee the best quality and efficiency of its services. In 2012 our advanced management system has been awarded with ISO 9001:2008, audited by ‘Intertek’ and accredited by the ‘Deutsche Akkreditierungsstelle’. We are proud to proclaim this validation, simultaneously ensuring our customers the right handling and management of projects and services, now and in the future.

Eternal Sun is ISO 9001:2008 certified by Intertek