What Size Solar Panel Do I Need to Charge a Cell Phone
Find out exactly what size solar panel you need to keep your cell phone charged using solar power.
What Size Solar Panel Do I Need to Charge a Cell Phone?
Charging a cell phone with solar power is simpler than you might think. Most smartphones have relatively small batteries that don't require much power.
Phone Battery Basics
Most smartphones have batteries between 3,000-5,000 mAh. At 5V, that's roughly 15-25 Wh of energy.
Recommended Panel Size
- 5W panel — Will charge a phone, but slowly (4-6 hours)
- 10W panel — A good balance of size and speed (2-3 hours)
- 20W panel — Fast charging, can charge multiple devices
Tips for Solar Phone Charging
- Use a panel with a built-in USB port for convenience
- A small battery bank paired with a solar panel gives you charging flexibility
- Keep the panel in direct sunlight and avoid shade
- Foldable panels are best for portability