Eternalsun

About

Founded in 2011, Eternalsun is a private headquartered in The Hague, Netherlands with approximately 50-200 employees specializing in Solar.

Eternalsun is a global leader in solar panel testing technology founded in 2011 as a Delft University of Technology spin-off. The company manufactures advanced solar simulators (LED-based steady-state and XENON-based flash) for photovoltaic module and cell testing, and provides independent inspection services including visual inspection, EL testing, IV curve testing, and factory audits. Operating from locations in six countries across three continents, Eternalsun serves over 60 countries. The company offers ISO17025 accredited testing according to IEC 61215, IEC 61730, and IEC 61853 standards. Recent acquisitions include Spire Solar's metrology division (2016), SunChine factory inspection services, and WAVELABS (2025). In May 2025, Bolster Investment Partners acquired an 80% stake, with the company subsequently acquiring WAVELABS in June 2025.

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