Off-Grid Solar-Powered Raspberry Pi
Size a panel, charge controller and LiFePO4 battery to keep a Pi project running 24/7 with no outlet.
Remote cameras, weather stations and LoRa gateways often live far from power. The secret is honest math: daily energy use, sun hours and enough battery for cloudy days.
Fuse the battery's positive lead close to the battery, use wire rated for the current and a charge controller that matches your battery chemistry.
Video tutorial
Video by Luke Ditria, embedded from YouTube. The written steps below are our own and match the parts list.
Mission steps
Measure daily energy
Use the INA219 guide. Example: a Pi Zero 2 W at about 0.6 W average uses 0.6 W × 24 h ≈ 14.4 Wh per day.
Size the battery
For three cloudy days: 14.4 × 3 ≈ 43 Wh. A 12.8 V 6 Ah LiFePO4 holds about 77 Wh, a comfortable margin.
Size the panel
With about 4 peak sun hours and system losses, 14.4 Wh ÷ (4 h × 0.6) ≈ 6 W minimum — a 20 W panel recharges after bad weather.
Wire safely
Panel → solar charge controller (LiFePO4 profile) → battery; controller load output → fused 12 V → 5 V buck converter → Pi.
Cut the waste
Disable HDMI and LEDs, use OS Lite, and shut down or sleep at night if the project allows.
Questions
Why LiFePO4 instead of LiPo?
LiFePO4 is much safer, lasts thousands of cycles and tolerates heat better — ideal for outdoor boxes in the sun.