This document presents a student project to design a low-cost solar cell charger for charging mobile phones. The components of the charger include a 10-watt solar panel, DC-DC converter, universal charging port, and heat sink. The working principle is that the solar panel generates electricity from sunlight which is regulated by the DC-DC converter to a stable voltage before being delivered to charge a phone through the universal charging port. Measurements showed the converter could output 5V at 70mA to charge a phone over 5 hours from a 18V, 55mA input. The project aims to provide an affordable way to charge phones using renewable solar energy.

1. Presented By
Kawsar Ahmed Refat
Roll : 200238
Session : 2019-2020
Department of Electrical and
Electronic Engineering
Pabna University of Science and
Supervised By
Diponkar Kundu
Associate Professor & Chairman
Department of Electrical and
Electronic Engineering
Pabna University of Science and
Technology
PROJECT NAME
Low-cost solar cell charger for charging mobile
phones

2. CONTENTS
• Introduction
• Motivation
• Components
• Circuit Diagram
• Working Principle
• Advantage
• Application
• Measurement
• Charging rate
• Final Project
• Conclusion 2

3. INTRODUCTION
The sun is made up of hydrogen and helium and it
emits large amount of heat.
A solar cell which forms a primary part of the solar
mobile charger works on the principle of photovoltaic
effect.
It is made up of packets of energy called "photons".
When a photon is absorbed the energy of the photon is
transferred to the electron.
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4. MOTIVATION
We are select this project because we can be charged
anywhere without the need of any electric power. These
devises are light weighed and easily portable. Renewable
technology and not harmful to the environment.
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5. COMPONENTS
 Solar Panel
 Wire
 DC-DC Converter Step-Down Power Module
 Universal Charging Port
 Heat sink
10-Watt solar panel USB port Wire Heat sink
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6. DC-DC CONVERTER STEP-DOWN POWER
MODULE
Potentiomete
r
Voltage
regulator
DC-DC Converter circuit diagram
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Input Voltage: 5V- 35V
Output Voltage :1.5V-35V

7. WORKING PRINCIPLE
Solar Panel
Solar Panel is the series arrangement of solar cells. When the light
rays hit upon the panel, the free electrons start moving and initiate
the current production process.
DC-DC Converter Step-Down Power Module
The voltage from the solar panel is not stable and varies according to
the intensity of the sun rays and the degree of incidence over the solar
panel. Hence to regulate the voltage, Voltage Regulator circuit is us.
Universal Charging Port
Universal Charging Port is connected to the Voltage Regulation circuit
to plug- in the device to be charged. 7

8. WORKING PRINCIPLE
This is the
diagrammatic
working of a Solar
panel.
This forms the basic
principle of a Solar
mobile charger.

9. CIRCUIT DIAGRAM
Fig: Circuit board connection
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10. ADVANTAGE
Electrical Independence
Clean, Quite, & Easy to use
Solar Power Maximizes Battery Life
Low Maintenance
It's Safe and Reliable
Low cost 9

11. APPLICATIONS
 Flood affected area where power cut for 10-15 days.
 For traveling where there is no electricity.
 Useful for the users in remote area.
 charge other rechargeable devices such as.
Bluetooth headsets, music players and power bank.
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12. MEASUREMENT
DC-DC Converter :
Input
Voltage= 18V
Current = 55 mA
Output
Voltage = 5V
current = 70 mA
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13. CHARGING RATE
Android Phone
3 minutes charge increase 1%
Full charge in 5 Hours
Button Phone
Full charge in 2 Hours
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14. FINAL PROJECT
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15. CONCLUSION
• The battery must be used efficiently.
• Battery life is high.
• solar mobile charger is highly applicable in today's
world.
• This is due to the continual depletion of resources.
• Solar energy is renewable and can be used for the
simplest of purpose solar mobile chargers.
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16. Thank You
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