The reference
LED solar simulators
for the world’s photovoltaics.
Avalon ST and Pasan build long-pulse LED solar simulators and electroluminescence systems for PV metrology. IEC Class A+ certified, with the Nexun Ultra reaching A++, chosen by certification bodies and national laboratories for their most demanding measurements.
We’ll be there
Catch us at the major PV shows. Book a slot for a demo or just a coffee.
Measuring technology you can trust.
For nearly five decades, first as Pasan, now as one group with Avalon ST, we have set the pace of PV metrology. The world's leading certification bodies don't just rely on our systems, they define the standard with them.
Accuracy without equal
Class A+++ traceability with sub-0.5% uniformity, the top of the IEC 60904-9 scale, built for high-capacitance HJT and TOPCon cells.
Full LED. No consumables.
37-wavelength LED arrays replace xenon lamps, no lamp ageing, no spectral drift, lower TCO.
Uniformity robot
Automated robotic scan of the full active area calibrates spatial non-uniformity at every cell position, TÜV-verified, no manual passes, repeatable in minutes.
Customisation
From 600×600 mm research benches to 4000×4000 mm Pro Max systems, every Nexun is tailored to the modules it has to measure.
Nine systems. One physics-grade platform.
From production-line throughput to research-grade uncertainty, every Nexun shares the same long-pulse LED engine, the same calibration chain, and the same Avalon software.
Nexun Mobile Lab
The accredited-grade flash lab that comes to the plant. Van, trailer or container, anywhere in the world.
- 60 panels/h throughput
- 150 Mpx EL imaging
- Van, trailer or container configurations
Nexun PRO MAX
The new benchmark for quality labs. 1300 W/m² peak, 0.2% LTI, class A++ A+ A++ per IEC 60904-9.
- 500 ms pulse · 22 wavelengths · <1% uniformity
- Up to 1.8 × 3 m active area
- Perovskite + thin-film (CIGS) ready with precon add-on
Nexun ULTRA
37 wavelengths, sub-0.5% uniformity. The reference instrument.
Specs
Nexun PRO
The industry’s default silicon workhorse. Certification-grade numbers at production cost.
Specs
Nexun EVO
Production-line flash testing at full takt. 100 ms pulse, built for gigawatt throughput.
Specs
Perovskite
The definitive bench for metastable cells. 500 ms pulse with integrated preconditioning.
Specs
Cosmo · AM0
The AM0 reference for space PV. 300–1900 nm for triple and quadruple junctions.
Specs
MiniLab
600×600 mm bench platform for cell-level R&D.
Specs
Nexun Steady-State
The steady-state Nexun. Full-LED, low footprint, large active area, and the instrument of choice for long-soak measurement and perovskite preconditioning.
SpecsAll nine systems, side by side.
Spectra, pulse lengths, active areas and IEC classes for the whole Nexun family on one page.
Find your simulator.
Pick the technology, throughput and active area that match your line or lab. We'll point you at the right Nexun and get you a quote within two business days.
Tell us what you measure.
PROA++ A+ A++
Mid-range and cost-effective for labs and production
Trusted where measurement is the product.
Avalon and Pasan systems run in the world's leading PV laboratories, certification bodies and gigafactories. Wherever a tenth of a percent decides a contract, the measurement runs on our instruments.
Setting the standard.
From product launches to fundamental measurement research, what we're working on.
Meet us at SNEC, Intersolar Europe and EU PVSEC 2026
Three PV shows, one busy season. The Nexun Mobile Lab is going on tour, and we'll be talking long-pulse LED, xenon-grade calibration and what's next for the Nexun line.
Read article
Avalon ST acquires PASAN SA, uniting two leaders in PV metrology
The acquisition combines Avalon's LED leadership with Pasan's xenon heritage. Two product lines, one group, headquartered in Neuchâtel.
Read article
LED solar simulator en route to UNSW Sydney
A Nexun PRO ships to the University of New South Wales for next-generation cell research. Australia's leading PV institute joins the LED-class adopters.
Read articleLet's measure something precisely.
Tell us about your panels, throughput targets and lab footprint. An Avalon application engineer, based in Switzerland or your region, will scope a system in two business days.
- Application-engineering call within 48 h
- Full quote with delivery and integration timeline
- Reference visits to operating Nexun installations
- Trade-in path for legacy xenon simulators