DC-DC Step-Down Converter Dual USB 5V 3A | 6V–40V Input

DC-DC Step-Down Converter Module with Dual USB Output — 6V–40V to 5V 3A

Power two devices at once from virtually any DC source with this compact, high-efficiency step-down (buck) converter module. Whether you're running it off a solar panel, a 12V/24V vehicle system, or any DC supply between 6V and 40V, this little board steps the voltage down to a clean, stable 5V at up to 3A — perfect for charging smartphones, tablets, power banks, and other USB-powered devices on the go.

Key Features

• High Efficiency — Up to 92%: The advanced switching design delivers up to 92% power conversion efficiency, minimising heat and energy waste for faster, more reliable charging.
• Dual USB Ports: Two USB-A outputs let you charge two devices simultaneously. Total combined output is 5V / 3A (max), with built-in identification resistors for broad device compatibility.
• Wide Input Range (6V–40V DC): Compatible with a huge variety of sources — solar panels, lead-acid and lithium battery banks, vehicle 12V/24V rails, and more. Input via standard 5.5×2.1 mm DC barrel jack.
• Compact Form Factor: Measures just 50 × 35 × 12 mm and weighs next to nothing, making it ideal for embedded installations, DIY projects, and portable setups.
• Wide Operating Temperature: Rated from −40 °C to +85 °C, so it performs reliably in harsh environments — under the bonnet, in an outdoor solar enclosure, or in extreme cold.
• Includes Wiring Lead: Comes with a pre-attached wire for quick, hassle-free installation.

Technical Specifications

What's in the Box

• 1 × DC-DC Step-Down Converter Module (Dual USB)
• 1 × Wiring Lead

Typical Applications

• Solar charge controllers and off-grid solar setups
• 12V / 24V vehicle USB charging (cars, trucks, caravans, boats)
• DIY electronics projects and embedded systems
• Portable battery packs and power banks
• Remote monitoring stations and outdoor IoT devices

Made in Mainland China.

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For further information on safe electrical and electronic component standards, visit the U.S. Consumer Product Safety Commission (CPSC).

Learn more: Electric power conversion

Frequently Asked Questions

Q: Can this step-down converter module handle a 24V vehicle or solar panel input?

A: Yes — the module accepts any DC input from 6V to 40V, making it fully compatible with 12V and 24V vehicle systems as well as most solar panels and battery banks. It steps the voltage down to a stable 5V output regardless of the input voltage within that range.

Q: Can I charge two devices at the same time using both USB ports?

A: Absolutely. Both USB-A ports can be used simultaneously. The total combined output is 5V at up to 3A, so two devices sharing the load will each receive up to the amperage their own circuitry requests, up to the 3A combined maximum.

Q: What type of connector does the input use?

A: The input uses a standard 5.5×2.1 mm DC barrel jack, which is one of the most common connector types used in solar controllers, power adapters, and DIY electronics. The included wiring lead makes it easy to hardwire directly into your project or vehicle.

Q: Is this module suitable for outdoor or in-vehicle use?

A: Yes. With an operating temperature range of −40 °C to +85 °C, the module handles extreme heat and cold well, making it suitable for under-bonnet vehicle installations, outdoor solar enclosures, and off-grid remote setups.