Solar windows light the way for building-integrated energy
The NSCC Applied Energy Research team, in collaboration with Kohltech Windows and Entrance Systems, installed Atlantic Canada’s first solar photovoltaic (PV) window in a working office building. Backed by Research Nova Scotia and Surrette Battery Company, the project integrates solar technology directly into window glass, creating a system that produces power while still providing daylight and a clear view.
The result is a sleek, double-paned window that doesn’t just offer a view or daylight, it quietly generates clean energy using a special solar film on the inside of the glass.
Photovoltaic window test results
“This kind of building-integrated solar system is exciting because it doesn’t need new space - it uses the windows you already have,” says Wayne Groszko, NSCC Research Scientist. “That makes it perfect for offices, schools and homes where rooftop solar might not be an option.”
The window is part of a full off-grid system that includes energy storage and an inverter to power devices inside the building. An NSCC engineering student even helped design and build the power distribution box that connects everything together.
Throughout February, the solar-powered setup successfully ran a laptop, monitor and phone charger in a Kohltech office, despite it being one of the lowest solar production months of the year.
Solar electricity production
Early data shows the PV window system performed well, generating nearly 10 kWh of electricity in February, about two-thirds of what a traditional solar panel might produce in the same conditions. Tree shading and winter light levels played a role in that number, but the experiment offered valuable insight into real-world performance. The output is charted below and varied daily according to the weather.
Daily solar electricity production in kWh. *Feb 27 and 28 the solar power system was offline*
“There’s still work to do, but this project shows that solar windows can be a functional part of sustainable building design,” says Wayne. “This small but mighty installation is a strong proof-of-concept for how windows can pull double duty - letting light in and generating power. It’s a good step toward more energy-resilient spaces.”
This research project involved integrating photovoltaic film into sealed window units, designing compatible window frames, wiring, energy storage and distribution systems, and installing and testing everything in a live, off-grid configuration. The success of this first installation points to a future where clean energy is embedded directly into the fabric of our buildings.