Wellsun

What Wellsun does

Wellsun is a Dutch private company founded in 2013 in Delft, Netherlands, that designs and sells the Lumiduct, a transparent solar shading system for glass buildings. The product integrates sun-tracking photovoltaic panels into building facades, combining on-site energy generation (30% panel efficiency, 300 Wp/m2 peak power), selective daylight control, and thermal management in a single double-skin facade solution. The company targets commercial and residential buildings with significant glass facades, selling primarily to architects, property developers, and building owners through an enterprise field-sales motion, supplemented by a channel partnership with facade installer ODS Geveltechniek.

The company operates with a lean team of approximately six members spanning mechanical, software, and sustainability engineering, and its technology development is underpinned by research partnerships with TU/e Eindhoven and Radboud University, and a technology alliance with Morgan Solar. Revenue is generated through hardware sales of the Lumiduct system and optional professional services for installation, system integration with building management systems, and remote monitoring. Pricing is bespoke and project-specific, with no public list prices disclosed.

Wellsun has completed one publicly documented pilot installation with Mondial Movers (a Dutch moving and logistics firm with 27 branches) and is supported by non-dilutive funding from the European Union Horizon 2020 program (grant agreement No. 856071, 2019), DOEN, SDTC, and OP Zuid. Geographic focus is the Netherlands and broader European market, with brand recognition supported by a TEDxAmsterdam Award nomination (2017), DOEN Energie[s]topper finalist status (2018), and coverage in industry publications including USGlass Magazine and de Architect. The company has no disclosed AI/ML capabilities, no app products, and no public API.

Name

Wellsun

Legal name

Wellsun

Website

https://wellsun.nl

Company type

Private

Founded year

2013

Operating status

Operating

Headcount range

1–10 employees

Short description

Wellsun is a Delft-based private company that designs and sells the Lumiduct, a transparent sun-tracking solar shading facade system for glass buildings, targeting architects, property developers, and building owners in the Netherlands and Europe through project-based enterprise sales.

Ownership category

akta.pro rank

Product category

Building-Integrated Photovoltaics (Solar Shading Systems)

NAICS

Blind and Shade Manufacturing (33792), Electric Lighting Equipment Manufacturing (33513)

SIC

Electric Lighting & Wiring Equipment (3640)

akta.pro primary industry

Smart Lighting & Shading Systems (HSAPAPAC)

akta.pro secondary industries

Lighting Controls & Smart Lighting Systems (BPABAGAC), Lighting Controls & Building Integration (Drivers, sensors, dimming, lighting control panels, networked lighting) (IMAGAIAI)

Keywords

• Transparent solar shading
• Building-integrated photovoltaics
• Solar facade systems
• Energy-generating windows
• Sustainable building technology

Headquarters

HQ city

Delft

HQ country

Netherlands

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Lumiduct System Sales: Sale of integrated solar shading systems for glass buildings. Systems include sun-tracking panels, double-skin facades, and optional media wall capabilities. Revenue from hardware sales with potential for ongoing service and monitoring contracts.
2. System Integration and Monitoring Services: Optional heat exchanger for increased energy efficiency, optional remote system monitoring, and connection to building management systems. Professional services for installation and integration.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels8 records

Core offering

Wellsun designs, manufactures, and sells the Lumiduct, a transparent solar shading system for glass building facades. The product integrates sun-tracking photovoltaic panels that generate electricity while selectively blocking direct sunlight and transmitting diffused daylight. The system is sold as a project-based hardware solution with optional installation integration, remote monitoring, and BMS connectivity services for commercial and residential glass buildings.

Product overview

Wellsun offers a unified product portfolio centered on the Lumiduct system, an innovative transparent solar shading solution for glass architecture. The core Lumiduct product combines sun-tracking solar panels with selective shading and daylight control capabilities, and is available with an optional Lumiduct Media add-on for LED media wall functionality. The system can integrate with building management systems for centralized control.

Differentiator

Problem solved

Functional benefit

Products and services

• Lumiduct Transparent solar shading system that uses sun-tracking photovoltaic panels integrated into glass facades to generate electricity while providing selective daylight control and heat management for commercial and residential buildings with significant glass architecture.

Quantifiable outcome

• 50% reduction in energy use for tall, glass buildings
• +4 more outcomes

Named customers1 record

Segments2 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

Feature6 records

Partnerships

Six partnerships are on record, tiered core and minor.

• Morgan SolarcoreTechnology or IntegrationTechnology partner for solar panel technology integration into the Lumiduct system.
• TU/e (Eindhoven University of Technology)coreStrategic or Co-development PartnerResearch partnership with the university for development and testing of the Lumiduct technology.
• Radboud UniversitycoreStrategic or Co-development PartnerAcademic partnership for research and development of solar building integration technology.
• ODS GeveltechniekcoreTechnology or IntegrationFacade technology partner for integration and installation of the Lumiduct system in building projects.
• BIPv NederlandminorOthersDutch Building Integrated Photovoltaics industry association membership supporting industry standards and market development.
• Mondial MoverscoreStrategic or Co-development PartnerPilot project partner for first commercial installation of Lumiduct. Sustainability-focused customer who is market leader for private removals in Netherlands with 27 branches.

Scale indicators3 records

Recent moves5 records

Expansion highlights6 records

Emerging players

• ClearVue Technologies: Australia-listed company developing solar glazing technology for building windows and facades. Comparable as an early-stage BIPV glass company with similar transparent solar + facade integration value proposition, though at a different geographic market.
• Heliatek: Germany-based organic photovoltaic film company targeting building-integrated solar applications. Comparable as a European BIPV technology developer, though focused on flexible organic solar films rather than rigid facade panels.
• SolarWindow Technologies: US company developing transparent liquid coatings that generate electricity on glass surfaces. Comparable as a transparent BIPV solution targeting glass facades and windows, though using coating rather than tracking panel technology.
• Oxford Photovoltaics: UK/Germany perovskite-solar cell company with applications in BIPV glass. Comparable as an emerging BIPV technology developer, though focused on perovskite cell chemistry rather than tracking panel architecture like Wellsun's Lumiduct.
• SunPartner Technologies: French company developing transparent photovoltaic films (Wysips) for integration into glass surfaces and displays. Comparable as a transparent BIPV technology targeting windows and facades, though using film-based rather than tracking-panel approach.

Broad incumbents

• SageGlass (Saint-Gobain): Division of Saint-Gobain producing electrochromic smart glass for commercial buildings. Comparable as an established player addressing daylight/heat control in glass facades, but with much greater scale, distribution, and a tinting-based rather than solar-generating approach.
• View (formerly View Dynamic Glass): US-based smart glass manufacturer producing electrochromic windows that dynamically tint to control glare and heat. Comparable in addressing glass building energy and daylight challenges, but uses dynamic tinting rather than solar generation, positioning it as an adjacent/competing facade technology.

Direct peers

• Physee: Dutch startup developing SmartSkin, transparent solar coatings for windows that generate electricity while remaining see-through. Comparable to Wellsun as a Netherlands-based BIPV pioneer targeting commercial glass buildings with similar transparency + energy generation value proposition.
• Onyx Solar: Spanish manufacturer of building-integrated photovoltaic (BIPV) glass for facades, skylights, and curtain walls. Directly comparable as it produces transparent solar glass for commercial buildings, competing head-to-head with Wellsun's Lumiduct in the sustainable glass architecture segment.

Others

• Carmanah Technologies (Solar LED/Building): Canadian sustainable energy technology company with solar building products and shading-adjacent offerings. Comparable as a building-integrated solar player in a related but distinct product category (mostly off-grid solar and lighting rather than facade-integrated shading).

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/Lumiduct
• Facebookfacebook.com/TheLumiduct
• LinkedInlinkedin.com/company/10647667
• Instagraminstagram.com/lumiduct/?hl=en

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Funding overview

Funding rounds2 records

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 Wellsun