Reading the offline archive without the grid: solar power and low-power devices
How to run an offline library with a small solar panel, a battery and a low-power device, and how much power it needs.
Quick answer
Use a low-power device (tablet, laptop or Raspberry Pi) running Kiwix, a 50 W solar panel with a charge controller and battery, spare cables, and two copies of the drive. A Pi serving Wi-Fi can share the library with every phone in a camp.
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Reading the archive without the grid
A drive full of knowledge is useless if nothing can read it. Plan the reader as carefully as the library.
What you need
- A low-power device to read the archive: a laptop, tablet or small computer (for example a Raspberry Pi) that can run the Kiwix reader. Keep two, plus the app installers for each operating system on the drive.
- A way to charge it: a small solar panel (20 to 100 watts is plenty for a laptop and lights), a charge controller, a battery (a 12 V battery or a power bank), and the right cables and adapters.
- A storage plan: two copies of the drive in different places, protected from water, heat and shocks.
Power budget
| Device | Typical draw |
|---|---|
| Tablet or e-reader | 2 to 10 W |
| Small single-board computer | 3 to 10 W |
| Laptop | 20 to 60 W |
| LED light | 1 to 5 W |
A 50 W panel in good sun gives roughly 150 to 250 watt-hours a day. That is enough for several hours of reading on a laptop or all day on a tablet.
Share it
- A small computer with Wi-Fi can serve the archive to every phone and tablet in the group with no internet (the Internet-in-a-Box and Kiwix-hotspot approach). See Downloads.
- A reading room in one building with a table, a lamp and the device.
Keep it working
- Keep spare cables, chargers and batteries; they fail before the archive does.
- Protect from damp and dust: silica gel, sealed containers.
- Copy the drive every year and check its checksum.
- Print the vital pages in case all devices fail.
Common questions
How much power does a reader need?
A tablet 2 to 10 W; a small computer 3 to 10 W; a laptop 20 to 60 W.
What breaks first?
Cables, chargers and batteries, not the archive. Keep spares.
Can one device serve many people?
Yes: a small computer with Wi-Fi can serve the archive to every phone nearby.