Spire

What Spire does

Spire, operating through its Eternal Sun Spire subsidiary in Spijkenisse, Netherlands, develops and manufactures high-end solar simulation equipment used for IV-testing of photovoltaic (PV) modules and provides PV import testing and factory inspection services. The company's hardware portfolio centers on two technology platforms: LED-based steady-state solar simulators (including the Class AAA LED-based Solar Simulator, Mini LED Light Soaker, and High Performance Light Soaker) and Xenon-based flash solar simulators (including the SPIRE Xenon Solar Flasher and the SPIRE Temperature Controlled Laboratory Flasher), supported by measurement accessories such as the Flasher Micro Uniformity Measurement Tool and the Uniformity Calibration Robot. All flagship simulators are certified to A+A+A+ class under IEC 60904-9 ed. 3 and support the full range of PV technologies (PERC, IBC, HJT, perovskite/tandem, CdTe) including bifacial, half-cut, shingled, and large-format modules.

The business operates two revenue streams. The first is capital equipment sales to solar module manufacturers, PV research institutions, and solar power producers, sold via direct B2B enterprise sales with quote-based procurement and no publicly disclosed pricing. The second is professional services: PV import testing at the ports of Rotterdam (operated through OdinSpire, a wholly-owned sub-brand) and Valencia, plus on-site factory inspections in China and Southeast Asia. The company also markets complementary IEC 61215 / IEC 61730 / IEC 61853 certification lab infrastructure and runs technical webinars and whitepapers as content-marketing channels targeting solar industry professionals. Stefan Roest is the founder and CTO, and the company describes itself as a "worldwide leading" manufacturer of solar module testing equipment.

Name

Spire

Legal name

Eternalsun Spire

Website

https://spirecorp.com

Company type

Private

Founded year

1969

Operating status

Operating

Headcount range

101–250 employees

Short description

Spire (via Eternal Sun Spire) manufactures LED and Xenon-based solar simulators for IV-testing PV modules and provides PV import testing at Rotterdam and Valencia plus factory inspections in Asia, serving module manufacturers, research labs, and solar power producers.

Ownership category

akta.pro rank

Product category

Solar Testing Equipment

NAICS

Testing Laboratories and Services (54138), Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515), Testing Laboratories and Services (541380)

SIC

Services-Testing Laboratories (8734), Industrial Instruments For Measurement, Display, And Control (3823), Optical Instruments & Lenses (3827)

akta.pro primary industry

Solar Quality, Testing, Certification & Standards (Lab Testing, Inspections, Compliance) (EUAMABAN)

Keywords

• Solar module testing
• Photovoltaic simulation
• PV testing services
• Solar simulator equipment
• IV testing equipment

Headquarters

HQ city

Bedford

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Technology or R&D, Operations, Marketing or Sales, Supply Chain, Infrastructure

Revenue model

1. Solar Simulator Equipment Sales: Sale of high-end solar testing equipment including LED-based steady-state simulators, XENON flash solar simulators, and temperature controlled laboratory flashers for PV module testing
2. Testing & Inspection Services: PV import testing services in ports (Rotterdam, Valencia) and factory inspections in China and Southeast Asia for quality assurance in the solar supply chain

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Spire, through its Eternal Sun Spire subsidiary, manufactures and sells high-end solar module testing equipment — LED-based steady-state solar simulators and Xenon-based flash solar simulators — used by PV module manufacturers, research institutions, and power producers to perform IV-testing, certification, and quality control. The equipment portfolio is complemented by PV import testing services at the ports of Rotterdam and Valencia (under the OdinSpire sub-brand) and on-site factory inspection services in China and South-East Asia.

Product overview

Eternal Sun Spire is a solar testing equipment manufacturer offering a comprehensive portfolio of solar simulation products and inspection services. The product line centers on three core equipment categories: LED-based steady-state solar simulators (including the Class AAA Steady-State LED Simulator, Mini LED Light Soaker, and High Performance Light Soaker), Xenon flash solar simulators (including the SPIRE Xenon Solar Flasher and SPIRE Temperature Controlled Laboratory Flasher), and precision measurement accessories (Flasher Micro Uniformity Measurement Tool and Uniformity Calibration Robot). These products enable IV-testing for all PV technologies including PERC, IBC, HJT, Perovskite, CdTe, bifacial, half-cut cell, shingled, and large modules. The portfolio is complemented by three testing services: PV Factory Inspections in China/South-East Asia, and PV import testing at the ports of Rotterdam and Valencia.

Differentiator

Problem solved

Functional benefit

Brands

• OdinSpire: PV import testing services at ports of Rotterdam and Valencia

Products and services

• Class AAA Steady-State LED-based Solar Simulator A+A+A+ LED-based steady-state solar simulator suitable for laboratory IV-testing of PV modules, including tandem and perovskite architectures, with tunable spectrum and adjustable irradiance.
• SPIRE Xenon Solar Flasher Xenon-based flash sun simulator for solar panel IV-testing in both laboratory and manufacturing environments, featuring A+A+A+ class illumination and Xenon Single Long Pulse >110ms.
• SPIRE Temperature Controlled Laboratory Flasher Laboratory flash solar simulator for high-accuracy IV-testing and temperature coefficient measurements (IEC 61215, IEC 61853) with 230ms Xenon Single Long Pulse and stable 10°C–85°C temperature control.
• Mini LED Light Soaker Steady-state LED solar simulator for testing PV cells up to mini modules, with a 50x50cm testing area, Class A+A+A+ illumination up to 36,000 hours, and precise sample temperature control.
• High Performance Light Soaker (HPLS AAA) High-performance LED-based light soaker for accelerated aging and stability testing of PV modules with extended continuous operation.
• Large Area Steady State (LASS AAA) Large-area Class AAA steady-state solar simulator for IV-testing full-sized PV modules.
• Uniformity Calibration Robot Automated robotic system for calibrating illumination uniformity across solar simulator testing surfaces.
• Flasher Micro Uniformity Measurement Tool Standalone measurement tool for assessing the micro-uniformity performance of flash solar simulators to ensure precise illumination quality.
• PV Import Testing — Port of Rotterdam Third-party PV import testing service operated by OdinSpire at the port of Rotterdam, providing quality verification of incoming solar module shipments for installers, EPCs, and utility buyers.
• PV Import Testing — Port of Valencia PV import testing service at the port of Valencia, providing independent quality verification of incoming solar module shipments.
• PV Factory Inspections (China and South-East Asia) On-site factory inspection service for PV manufacturing facilities in China and South-East Asia, verifying production quality and compliance for buyers.

Quantifiable outcome

• Xenon Single Long Pulse >110ms for manufacturing flashers
• +2 more outcomes

Named customers4 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators1 record

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• TÜV Rheinland: Global testing, inspection and certification (TIC) giant that operates PV certification labs and conducts PV module testing services. Competes with Eternal Sun Spire's OdinSpire port-testing and factory inspection service lines, not the equipment business.
• Chroma ATE: Taiwanese test-and-measurement incumbent with a broad portfolio spanning power electronics, battery, and solar IV-testing equipment. Offers PV testing solutions as part of a much wider portfolio, competing with Eternal Sun Spire primarily in manufacturing flashers.
• Keysight Technologies: Global leader in electronic test and measurement equipment. While not focused on PV-specific A+A+A+ simulators, Keysight supplies power analyzers and source-measure units that compete with adjacent portions of Eternal Sun Spire's measurement stack.
• Newport Corporation (MKS Instruments): US-based supplier of light sources, optical measurement, and solar simulation components. Broader portfolio than Eternal Sun Spire but competes in the OEM solar simulation light source segment and supplies research-grade PV testing labs.

Direct peers

• Endeas Oy: Finnish manufacturer of solar simulators and IV-testing equipment for PV modules. Closely comparable product portfolio to Eternal Sun Spire, with both steady-state and flash solutions for research and manufacturing customers.
• Pasan (now part of Meyer Burger): Swiss manufacturer of flash solar simulators for module IV-testing; one of the most direct competitors to Eternal Sun Spire's Xenon flasher product line. Now part of Meyer Burger, a vertically integrated PV equipment maker.
• Sinton Instruments: US-based manufacturer of solar cell and module characterization instruments, including lifetime and IV-testing tools. Direct competitor in the research and manufacturing PV testing market.
• Wavelabs: German cell-level solar simulator manufacturer; explicitly named as Eternal Sun Spire's complementary cell testing partner. Sells LED-based solar simulators for cells (vs. Eternal Sun Spire's module focus), making them a directly comparable and adjacent peer.
• HALM elektronik: German manufacturer of I-V curve measurement equipment and flashers for PV modules. Directly comparable to Eternal Sun Spire's flasher product line and competes in the same European tier-1 manufacturer market.

Regional players

• Spectrolab (Boeing): US-based (Boeing subsidiary) manufacturer of space-grade solar cells and related IV-testing equipment. Comparable to Eternal Sun Spire in advanced cell/module characterization (including space applications referenced on Eternal Sun Spire's site) but focused primarily on the US space/defense market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/spirecorp
• Facebookfacebook.com/186161086328
• LinkedInlinkedin.com/company/spire

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Subsidiaries1 record

Funding overview

Funding rounds1 record

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Spire