China’s ‘ultra-light soft battery’ solar wing for satellites packs 35 times its size
A satellite solar panel that rolls up like a yoga mat could soon free up precious cargo space on rockets heading to orbit. Chinese photovoltaic company Yanhe Tech has completed a prototype rollable solar wing built from perovskite material, and the device is now headed for in-orbit testing.
The prototype, called Xingyun, reworks how satellites carry their power source into space. During launch, the panel compresses into a compact reel roughly the diameter of a thermos flask. It then mounts flexibly against a satellite's side walls to save precious room inside the rocket.
Rolling instead of folding
Traditional satellite solar wings use rigid, foldable panels that add weight and eat into available storage space aboard a rocket. That design has become a growing bottleneck as the space industry shifts toward mass-producing micro-satellites, CubeSats, and small low-Earth-orbit constellations that launch in bulk.
Xingyun addresses that bottleneck with a super-elastic memory composite material that rolls into a compact cylinder rather than folding into rigid segments. Once in orbit, a passive drive mechanism unspools the panel in a single, smooth motion, avoiding the complex multi-step unfolding sequences traditional wings require.
Lighter, more compact power
Yanhe Tech says the rolled design weighs 25 to 30 percent less than conventional foldable solar wings. That weight savings directly boosts how much payload a satellite can carry elsewhere. The company also reports a storage ratio of 35 to 1, meaning the deployed panel spans 35 times its stowed volume.
That compression ratio matters most for missions stacking multiple satellites into a single launch, where every cubic inch of rocket volume carries a price tag. A single Xingyun wing can power micro-satellites and CubeSats on its own. Arrays of multiple wings could support larger missions like communication constellations, remote-sensing satellites, and deep-space exploration payloads.
A short lifespan
Yanhe Tech founder and CEO Feng Fan acknowledged that perovskite solar technology remains far from ready for widespread deployment in space. Perovskite cells built for orbital use currently carry an expected lifespan of only six months, and the underlying technology remains in an early verification stage.
Feng said the company is applying high-throughput AI methods to refine the material's chemical formulation, aiming to push both durability and performance further. Perovskite cells tend to degrade faster than traditional silicon solar cells when exposed to the extreme temperature swings and radiation found in low-Earth orbit.
Toward a space grid
Beyond the current prototype, Yanhe Tech has outlined a broader "space power station" plan targeting 2030. The company envisions a phased, three-tier energy network stretching across low-Earth orbit, medium-to-high orbits, and eventually lunar space.
Feng credited China's photovoltaic manufacturing base as a key advantage underpinning that ambition, describing the country's industrial supply chain for solar technology as among the world's most complete. He said private companies developing this technology intend to work alongside China's national space programs as the broader space energy sector develops.
