Quick answer

For powering small electronics like sensors, LEDs, or low-power microcontrollers, a 5.5V 90mA mini solar cell is a practical and affordable choice, but you need to match its output to your load and include a charge controller if adding a battery.

Why match voltage and current to your load

A mini solar cell's 5.5V output is higher than the 3.3V or 5V used by many small electronics, so you likely need a voltage regulator to avoid damaging components. The 90mA current limit means it can run only low-power devices directly (e.g., a single LED or an ATtiny85) without a battery buffer.

Trade-offs: Direct power vs. battery charging

Using the panel directly in bright sunlight gives intermittent power—your device stops when a cloud passes. Adding a rechargeable battery and a charging circuit (like a TP4056 module) smooths out supply but adds cost and size. The 0.6W output charges a small 3.7V LiPo slowly (e.g., ~160mA), so it's best for devices that run intermittently or have low duty cycles.

Decision rules for your mini solar project

  • Estimate your load current: Add up the milliamp draw of all components when active. If total ≤ 90mA, the panel can power them directly in good sunlight. If higher, you need a battery and charging circuit.
  • Choose between direct or battery-buffered: Direct power is simplest but stops when shaded. Use a battery (e.g., 18650 or 3.7V LiPo) with a charge controller if your device must run continuously or indoors.
  • Add voltage regulation if needed: Your project likely runs on 5V or 3.3V. Add a low-dropout regulator (like an LM1117-3.3) or a buck converter between the panel and the load. The panel's 5.5V gives you headroom for regulation. Test the panel output under your actual light conditions before finalizing the circuit.

Product facts

  • Solar Panel 5.5v 90mA 0.6W Mini Solar Cell 6.5 x 6.5: This mini solar panel delivers 5.5V at 90mA with a power output of 0.6W. The solar cells are encased and protected by a durable outer poly frame. Compact size: 6.5 x 6.5 inches. The 5.5V 90mA output suits small loads like a sensor node or a couple of LEDs, and the poly frame makes it durable for outdoor or benchtop projects.

    Solar Panel 5.5v 90mA 0.6W Mini Solar Cell 6.5 x 6.5

    Solar Panel 5.5v 90mA 0.6W Mini Solar Cell 6.5 x 6.5

Is this panel right for your project?

Best for

  • Low-power sensor nodes that wake up briefly to take a reading and sleep
  • Small outdoor projects like a garden light or an Arduino-compatible weather station running on a small battery

Not for

  • Devices drawing more than 100mA continuously (e.g., a motor driver or Wi-Fi module sending data often)
  • Projects that need to operate reliably under weak indoor light