Uni-Solar AF5 4218FG Amorphous Solar Cell 2V 0.35A Flexible Stainless Steel

Uni-Solar AF5 4218FG Amorphous Solar Cell 2V 0.35A Flexible Stainless Steel 25-Pack

This listing is for a pack of 25 Uni-Solar AF5 4218FG flexible amorphous thin-film solar cells on a stainless steel substrate. Each cell is a compact, lightweight strip with a tabbed ribbon connector and produces approximately 2 volts at 0.35 to 0.40 amps at maximum power point (MPPT). These are Q-Grade C cells — new and unused stock, well suited to DIY solar projects, custom panel builds, and experimental or educational applications where flexible, lightweight photovoltaic cells are needed.

Specifications & What's Included

• Manufacturer: Uni-Solar (United Solar Ovonic)
• Model: AF5
• Part Number: 4218FG
• Cell Technology: Amorphous Silicon (a-Si) thin film
• Substrate: Flexible stainless steel
• Nominal Voltage: 2 V per cell
• Nominal Current: 0.35 A per cell
• MPPT Current Range: 0.35 A – 0.40 A (seller-tested)
• Cell Grade: Q Grade C
• Approximate Cell Size: 7 in × 1.5 in
• Connection: Tabbed flex ribbon leads at one end
• Quantity: 25 cells per pack
• Condition: New, unused — open box

Applications

Uni-Solar (United Solar Ovonic) produced amorphous silicon thin-film solar cells on flexible stainless steel substrates starting in the 1980s, and these cells became a staple of both commercial roofing-integrated solar products and DIY photovoltaic projects. Unlike rigid crystalline silicon wafers, the stainless steel substrate makes these cells bendable, lightweight, and durable in situations where a rigid panel isn't practical — common uses include curved surface mounting, portable charging setups, small off-grid systems, and electronics experimentation. At 2V and 0.35A per cell, individual cells can be wired in series to build up voltage or in parallel to increase current, giving hobbyists and engineers fine-grained control over panel design. They are also widely used in educational and research settings to demonstrate thin-film photovoltaic principles. While Uni-Solar's manufacturing operations have since ceased, their cells remain actively sought by DIY solar builders and collectors for ongoing projects.