5V USB Solar Panel
USB-output solar panel for direct 5V device charging.
A solar panel with a regulated 5V USB output, simplifying direct charging of USB power banks and 5V project boards. Unlike a bare panel, it includes onboard voltage regulation so its output stays close to a stable 5V regardless of how much sunlight it's receiving, letting it plug straight into anything that normally charges from a USB cable — power banks, USB battery packs, or 5V-input dev boards — without needing a separate charge controller circuit.
Specifications
| Regulated output | 5V DC via a standard USB-A port |
| Rated power | Typically 1-5W depending on panel size, check the specific model's wattage rating |
| Cell type | Polycrystalline or monocrystalline silicon |
| Onboard regulation | Built-in DC-DC or linear regulator maintains a stable 5V output across varying light conditions |
| Output connector | Standard USB-A female port, compatible with any USB charging cable |
| Typical use case | Direct charging of USB power banks, or powering/charging 5V dev boards and battery-backed sensor nodes in the field |
Pinout
| Pin | Name | Description |
|---|---|---|
| 1 | USB VBUS (5V) | Regulated 5V output |
| 2 | USB GND | Ground reference |
| 3 | USB D+/D- | Data lines, typically shorted or biased to signal a standard charging port to connected devices (no data function) |
Because the USB output is already regulated to 5V, this panel can plug directly into most USB power banks or 5V boards without any extra charge-controller circuitry — but actual output current still depends heavily on real-time sunlight, so charging is noticeably slower in cloudy conditions or partial shade compared to the panel's rated wattage.
Variants
The USB-output panel is the simplest option when the goal is just charging a USB power bank or a board with a USB power input, with zero extra wiring. For a more efficient, purpose-built battery system (skipping the power bank's own charge circuitry entirely), pairing a bare panel with a dedicated LiPo charge controller like the CN3065 wastes less energy.
| Variant | Temp range | Hum range | Accuracy | Protocol | Price |
|---|---|---|---|---|---|
| Solar 5V USB panel (small, 1-2W) | ~$5-10 | ||||
| Solar 5V USB panel (larger, 5W+) | ~$10-20 | ||||
| Bare 6V panel + CN3065 charge controller | ~$4-8 combined |