Solestial, an emerging leader in solar energy for space is redefining how spacecraft are powered through its proprietary silicon-based photovoltaic (PV) technologies. Leveraging scalable manufacturing techniques and innovations in radiation-hardened materials, the company is delivering high-efficiency, ultra-thin solar products that significantly reduce cost and lead times compared to traditional III-V multijunction solar cells. From small satellites in LEO to long-duration lunar missions, Solestial's next-generation PV systems offer a robust alternative for powering spacecraft in the harshest environments.

Technology and Innovation

At the core of Solestial’s breakthrough lies its space-stable silicon heterojunction photovoltaic technology, which enables self-curing of radiation damage at standard operating temperatures. Unlike traditional silicon-based solar technologies that degrade in high-radiation environments, Solestial’s cells are engineered to anneal radiation effects in orbit, extending operational life and reliability.

These innovations are further supported by Solestial’s streamlined, scalable manufacturing methods that use commercially available silicon wafers and flexible polymer packaging in place of brittle cover glass. The result is a product suite optimized for low mass, high power density, and fast assembly, ideally suited for rapid deployment in responsive space missions and commercial satellite constellations.

Products and Services

Solestial offers a full range of solar solutions tailored for the next generation of space missions. These include individual solar cells, fully packaged modules, and turnkey solar arrays designed for fast integration across commercial, civil and defense platforms.

Solar Cell

Solestial’s ultrathin silicon heterojunction solar cells offer up to 20% efficiency and are the only known silicon cells on the market that can self-anneal radiation damage during normal space operations. These cells are lightweight, flexible, and space-proven, enabling new levels of performance at a significantly lower cost than multijunction alternatives.

Flexible Solar Power Modules

By replacing traditional cover glass and substrates with advanced polymer layers, Solestial’s flexible solar power modules achieve durability and radiation hardness while maintaining a form factor that weighs significantly less than conventional modules. These systems are capable of operating for up to 10 years in orbit, making them ideal for long-duration CubeSat and small satellite missions.

Integrated Solar Power Modules

Designed for integration into various structural platforms, these modules combine Solestial’s flexible PV layers with rigid or flexible substrates, allowing for seamless installation on custom spacecraft surfaces. The modular integration reduces system complexity and speeds up spacecraft manufacturing timelines.

Solar Array

Solestial partners with aerospace deployment system providers to deliver complete solar array assemblies. Their solar power modules can be adapted to a wide range of array configurations, making the systems both versatile and ready for launch. These arrays are designed to meet the power needs of CubeSats, smallsats, and responsive satellite buses.

Recent Development

Recently, Solestial was awarded a $1.2 million Direct-to-Phase II contract from SpaceWERX to develop a rapidly manufacturable solar array wing for small satellites. This initiative supports the U.S. Space Force by enabling high-speed production of radiation-hardened solar systems. Under the program, Solestial will develop novel electrical interconnects, manufacture 1 kW of solar modules, and perform a full array assembly in just one month — a timeline unprecedented in the space power industry.

This project reinforces Solestial’s unique ability to offer scalable, defense-grade PV systems that meet urgent space mission timelines and cost constraints. To date, the company has secured over $7 million in SBIR contracts from agencies including NASA, AFRL, and the National Science Foundation.

Solestial aims to scale production of its second-generation silicon solar cells, targeting flight deployments by late 2025. The new product generation will maintain high efficiency while incorporating enhanced radiation resistance and thermal stability.

In addition to expanding into multi-orbit constellations and lunar surface missions, Solestial is also investing in automated module manufacturing lines, positioning itself to support the growing demand for fast-turnaround satellite hardware in both commercial and government sectors. As the space ecosystem evolves toward high-volume, short-cycle missions, Solestial’s technology and business model are well-aligned to power the future of scalable space energy.

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