1. SOLAR POWER BANK
MINOR PROJECT SYNOPSIS
of
BACHELOR OF TECHNOLOGY
in
ELECTRICAL AND ELECTRONICS ENGNEERING
Submitted by:
Arpan Jain Sahil Kumar Siddharth Karamchandani
60114804916 41514804916 03296404916
Guided by
DEPARTMENT OF ELECTRICAL AND ELECTRONICS
ENGINEERING
MAHARAJA AGRASEN INSTITUTE OF TECHNOLOGY
2. (AFFILIATED TO GURU GOBIND SINGH INDRAPRASTHA
UNIVERSITY, DELHI)
SOLAR POWER BANK
CONTENTS
CONTENT PAGE NO.
INTRODUCTION 3
RATIONALE 4
OBJECTIVE 5
LITERATURE REVIEW 5
EXPECTED OUTCOMES 6
BIBLIOGRAPHY 7
3. INTRODUCTION
As non-renewable energy sources are decreasing, usage of solar energy
is increased. This solar energy is not only used on the Earth but also
used in space stations where no electrical power is available.
Here is the simple circuit to charge 12V, 1.3Ah rechargeable Lead-acid
battery from the solar panel. This solar charger has current and voltage
regulation and also has over voltage cut off facilities. This circuit may
also be used to charge any battery at constant voltage because output
voltage is adjustable.
Solar Battery Charger Circuit Principle:
Solar battery charger operated on the principle that the charge control
circuit will produce the constant voltage. The charging current passes
to LM317 voltage regulator through the diode D1. The output voltage
and current are regulated by adjusting the adjust pin of LM317 voltage
regulator. Battery is charged using the same current.
Solar Battery Charger Circuit Design
Circuit must have adjustable voltage regulator , so variable voltage
regulator LM317 is selected. Here LM317 can produce a voltage from
1.25 to 37 volts maximum and maximum current of 1.5 Amps.
Adjustable voltage regulator has typical voltage drop of 2 V-2.5V .So
Solar panel is selected such that it has more voltage than the load. Here
we are selecting 17v/5w solar panel.
Lead acid battery which is used here has specification of 12v/1.3Ah. In
order to charge this battery following are required.
4. Schottky diode is used to protect the LM317 and panel from reverse
voltage generated by the battery when it is not charging. Any 3 A
diode can be used here.
Solar Battery Charger Circuit Diagram:
Rationale:
The main purpose of using this project is to provide portable, reliable
power anywhere it is needed… from offgrid construction sites, to
remote locations where power is not accessible or affordable.
5. They don't require external electrical sources to recharge your batteries
and as a result use of our resources are minimized.
Objective:
Adjustable output voltage.
Circuit is simple and inexpensive.
Circuit uses commonly available components.
Zero battery discharge when no sunlight is on the solar panel.
LiteratureReview:
A literature review is a scholarly paper, which includes the current
knowledge including substantive findings, as well as theoretical and
methodological contributions to a particular topic. It includes
discussion about the components that are being used in the working of
solar power bank.
Expected Outcome:
6. Our project will help to reduce the use of non-renewable energy
resources and will help us to charge our device (mobile phone).
It can be used to store energy, which can be used later when sun is not
available on a wet or cloudy day. Moreover, it has zero battery
discharge when there is no sunlight on the solar panel.
BIBLIOGRAPHY
For making this report following references were used:
1. George Johnson “Plugging into The Sun” , National Geographic
magazine, Sept. 2009.
2. C.E.Kennedy and H.Price “Progress In Development of High
Temperature Solar Selective Coating”, Proceedings of
ISEC2005, August 6-12 2005, Orlando, Florida, USA.
3. John, Keit, Solar Battery Charger Circuit”,
http://www.electroschematics.com/6888/ [Online] (Retrieved
08/04/2015)
4. Electroshub, (2015). “Solar Battery Charger Circuit using LM317
Voltage Regulator”,http://www.electronicshub.org/solar-battery-
charger-circuit/ [Online] (Retrieved 07/ 15/ 2015)
