With full sunlight:
Base 5: 4-8 hours
Base 10: 6-12 hours
How long does it take to charge the WakaWaka Base from the grid?
Base 5: approximately 6.5 hours
Base 10: approximately 12.5 hours
When using a USB-port that can only deliver less than 1A (for example when you are charging your WakaWaka from a computer) charging will take longer.