Solar-Powered Mobile Charging Station

Problem statement

Students in campus outdoor areas may not have easy access to power sockets for charging mobiles or small devices.

Abstract

This project creates a compact solar-powered charging station. A small solar panel charges a 12V or 7.4V battery through a charge controller circuit. A DC-DC converter then provides regulated 5V USB output for charging mobile phones. Basic indicators show charging and battery status.

Components required

• Solar panel (10–20 W)
• Charge controller module (PWM or MPPT type)
• Rechargeable battery (Li-ion or lead-acid)
• DC-DC buck converter to 5V USB
• USB sockets
• Voltage/current indicators (optional)
• Enclosure and wiring

Block diagram

Working

The solar panel converts sunlight to DC power which is regulated by the charge controller to safely charge the battery. The DC-DC converter steps the battery voltage down to a stable 5V for USB ports. Indicator LEDs show when the system is charging and when the battery is low or full.

Applications

• Outdoor charging stations in campus
• Rural or off-grid areas
• Disaster relief charging points
• Intro project on renewable energy systems