Power / Solar Chargers
User Guide for Sandberg Solar Charger 21W 2xUSB+USB-C
Quick guide for the Sandberg Solar Charger 21W 2xUSB+USB-C (Model 420-55). Learn how to charge the powerbank via solar or AC, check battery levels, and charge your mobile devices.
Quick answers from the manual
Quick answer
- The Sandberg Solar Charger 21W can be charged via solar energy or an AC wall charger (using Micro USB or USB-C). It features a 10000 mAh battery and provides USB output ports to charge mobile devices. p. 2, 3
Key actions
- Charge via solar p. 2
- Charge via AC p. 2
Technical specifications
| Parameter | Value | Meaning | Pages |
|---|---|---|---|
| Battery Capacity | 10000 mAh / 37 Wh | Total energy capacity | p. 3 |
| Solar Panel | 21W | Solar charging power | p. 3 |
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Where to find it in the PDF
- Charging Instructions p. 2
- Specifications and Device Charging p. 3
- Warranty and Support p. 4
Table of contents
Manual images
Click an image to enlargeQuick guide from the manual
This guide provides essential instructions for operating the Sandberg Solar Charger 21W (Model 420-55). It covers methods for charging the internal powerbank, charging external devices, and monitoring battery status.
Charging the Powerbank
Solar Charging
To charge the powerbank using solar energy, position the solar panel at the most direct angle towards the sun as possible.
AC Charging
You can charge the internal battery using an AC wall charger. Connect the charger to the powerbank using either the Micro USB or USB-C input port.
Charging Devices
To charge your mobile devices, connect them to the USB output ports on the powerbank. The device will begin charging automatically.
Checking Battery Status
The powerbank is equipped with an LED indicator that displays the current battery level. The levels are indicated at 25%, 50%, 75%, and 100%.
Technical Specifications
- Battery Capacity: 10000 mAh / 37 Wh
- Solar Panel: 21W
- Charging time (Sun): 2 hours
- Charging time (USB 1A): 8 hours
- Charging time (USB 2.4A): 3 hours
- Charging time (USB-C 18W): 2 hours
Support and Warranty
The product comes with a five-year warranty. For support, visit http://helpdesk.sandberg.world. You can register your product at www.sandberg.world/warranty.
Official resources from the manual
Manufacturer information
Sandberg A/S
Practical help
Common problems
Slow charging via solar
Ensure the solar panel is positioned at the most direct angle towards the sun.
Before use
- Check the current battery level using the LED indicator.
- Ensure the solar panel surface is clean.
- Use the appropriate cable (Micro USB or USB-C) for AC charging.
- Verify the device is connected to the correct USB output port.
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Specs in practice
- Battery Capacity
- 10000 mAh / 37 Wh total energy storage.
Images and diagrams
- The diagram illustrates positioning the solar panel towards the sun.
- The diagram shows connecting the powerbank to an AC charger using Micro USB or USB-C cables.
- The diagram displays the LED battery level indicator (25% to 100%).
Model compatibility
- Supports charging via USB and USB-C.
- Compatible with standard USB AC chargers.
Manual page author
Michael Turner
Technical manual editor