Fraunhofer ISE and Source Energy Launch Silicon Solar Modules for Satellites

Germany’s Fraunhofer Institute for Solar Energy Systems ISE and U.S. company Source Energy have jointly created a silicon‑based solar module line for low‑Earth‑orbit satellites. The modules use a shingle‑matrix interconnection, where solar cells are cut into narrow strips and overlapped like bricks, allowing electrical continuity even if part of the panel is damaged by micrometeoroids or debris.

Prototype panels measure 321 mm × 209 mm, weigh 64 g, and deliver an average of 15.6 W (up to 16.1 W) with an active‑area efficiency of 18.8 % under AM0 conditions, giving a specific power of 252 W/kg. The shingle‑matrix design is compatible with standard wafer‑based cells (including PERC and HJT) and can be produced automatically at Source Energy’s Colorado facility, enabling delivery within six months of order and offering a lower‑cost alternative to the traditionally expensive III‑V solar technology used in space.

The new modules aim to reduce the cost and supply constraints of satellite power systems, making commercial LEO missions more affordable while providing robustness against temperature extremes and physical damage.