Solar panel Bresser 3810040 40W with USB — 40 W portable solar module with USB output

The Bresser 3810040 40W with USB is a compact portable solar module that converts sunlight into DC power for charging USB devices and feeding battery systems through compatible controllers. This 40 W solar panel integrates a USB output for direct charging of smartphones, power banks and small electronics. Its design emphasises portability and outdoor suitability, making it a practical option for camping, emergency power and off-grid situations where mains electricity is not available.

Advantages

The module delivers up to 40 watts of peak power in a lightweight format that is easy to transport and set up. The built-in USB output eliminates the need for a separate inverter for low-power USB gadgets, while the DC output can be connected to charge controllers or battery systems for longer-term energy storage. The panel’s weather-resistant construction supports use in outdoor conditions, and its compact footprint allows convenient placement on tents, backpacks or vehicle roofs.

Suitable for

• Charging smartphones, power banks and small USB-powered devices while camping
• Providing basic off-grid power for outdoor activities and remote work
• Emergency phone and device charging during power outages
• Supplementing battery systems via a compatible charge controller for small appliances

Key specifications

• Maximum power output: 40 W
• Integrated USB output for direct device charging
• Output type: DC (USB port and DC leads for controller connection)
• Suitable for portable and outdoor use; compact form factor
• Typical applications: USB charging, battery charging via controller, off-grid use

How to use

Place the solar module in direct sunlight with the photovoltaic side facing the sun for optimal performance. Connect a USB cable directly to the integrated USB port to charge compatible devices. For battery charging or to power larger DC systems, connect the panel’s DC leads to a compatible charge controller and then to the battery or system according to the controller manufacturer’s instructions. Avoid shading and position the panel at an angle that maximises sun exposure during the day.

Usage recommendations

To achieve reliable charging, ensure the panel is clean and free of dust or debris and orient it towards direct sunlight. Use an appropriate charge controller when connecting to batteries to prevent overcharging and to match voltage requirements. For prolonged outdoor use, secure the panel to prevent movement and protect connectors from moisture when not in use.