RadianX Raises $9 Million to Scale Low-Light Perovskite Solar Modules
California-based RadianX has raised $9 million in combined venture and project financing to scale production of its RadianX perovskite solar modules, which are designed to generate electricity in indoor and low-light environments. The company, formerly known as California Perovskite Technology, is targeting applications such as sensors, wearables, connected devices and physical AI systems.
The seed funding round was co-led by SOSV and Twynam. Other participants included One Small Planet, Sahsen Ventures, Avila VC, California Innovation Fund, quantumEDGE, Riceberg Ventures and Alumni Ventures.
Alongside the funding, Pacific Union Technology Precision Manufacturing (PUT), a publicly listed precision components manufacturer, is partnering with RadianX to fund a dedicated production line. The arrangement is intended to support commercial-volume manufacturing as the company moves beyond smaller-scale production.
How RadianX perovskite solar modules work
RadianX is developing thin-film photovoltaic technology using perovskite, a class of materials that can absorb light and convert it into electricity. The company says its modules can continue generating useful power under indoor lighting and diffuse daylight, where conventional silicon solar technology is generally less effective.
The modules are approximately 0.7 millimetres thick and can be produced in custom sizes and output voltages. This gives manufacturers more flexibility when integrating them into the surfaces of electronic products.
Potential applications include wireless sensors, wearable devices, asset trackers and other connected hardware. These products often rely on batteries that need periodic charging or replacement. A small solar module could supplement their power supply, extend operating time and reduce maintenance requirements.
RadianX is initially concentrating on hardware applications rather than large-scale solar installations. Its work with NGK Corporation, which pairs the company's modules with NGK's EnerCera batteries in wireless asset trackers, provides an example of how the technology could be integrated into connected products.
Dedicated production line targets commercial manufacturing
The partnership with PUT is an important part of RadianX's expansion plans. The company says it is building its first automated production line with a planned capacity of 6 megawatts. It intends to use the manufacturing setup as a model for future expansion.
The announcement does not disclose the production line's investment amount, precise location or a commercial production start date. The $9 million financing figure should therefore be distinguished from the separate manufacturing investment being provided through PUT's partnership.
RadianX also says its modules have received TÜV certification across all three categories of IEC TS 63163, the technical specification for photovoltaic modules used in consumer products. This includes Category 3, which covers products designed for high outdoor exposure.
The company has reported a certified efficiency of 22.33% for a 1.2-by-0.6-metre module. It also says its products have passed lead-release testing under the EU's REACH regulation and comply with RoHS requirements. These results address some of the durability, manufacturing and material-safety concerns that have slowed the commercial adoption of perovskite photovoltaics.
Why low-light solar technology matters
Many connected devices are installed indoors or in locations that receive little direct sunlight. Replacing their batteries can involve repeated maintenance, particularly when sensors and trackers are deployed across large facilities or difficult-to-access locations.
Low-light photovoltaic modules could provide an additional source of power in these settings. If they generate enough electricity for a device's operating requirements, manufacturers may be able to use smaller batteries or extend the time between replacements.
However, the technology's practical performance will depend on lighting conditions, device power consumption and the size of the solar module. It will not eliminate batteries across all connected products.
RadianX's $9 million financing and manufacturing partnership with PUT mark a step towards wider commercial deployment. Whether the technology can compete at scale will depend on production costs, long-term reliability and adoption by device manufacturers.
