This is a simple circuit to charge 1.2V, 4600mAh rechargeable Ni-MH battery from a solar panel. This solar charger has current and voltage regulation and also has over voltage cut off facilities. Solar battery charger operates on the principle that the charge control circuit will produce a constant voltage. The charging current passes to LM7805 voltage regulator through the diode D1. The output voltage and current are regulated by adjusting the adjust pin of LM7805 voltage regulator. Battery is charged using the same current.

1. SOLAR BATTERY CHARGER
Course Instructor: Shuvra Saha
Group Members:
Kader, Muhammad Salauddin 13-25396-3
Huq, Samiul 14-27014-2
Alam, Md. Taimy 14-27176-2
Ahmad MD Tanvir 14-27256-2
Avas, Abdullah Almamun 15-30792-3

2. INTRODUCTION
 This is a simple circuit to charge 1.2V, 4600mAh rechargeable Ni-MH battery
from a solar panel. This solar charger has current and voltage regulation and
also has over voltage cut off facilities.
 Solar battery charger operates on the principle that the charge control circuit
will produce a constant voltage. The charging current passes to LM7805
voltage regulator through the diode D1. The output voltage and current are
regulated by adjusting the adjust pin of LM7805 voltage regulator. Battery is
charged using the same current.

3. Components
 LM7805 Voltage Regulator
 Rechargeable AA Battery
 Resistor – 1 kilo ohms
 Diodes – 1N4007 x2
 Capacitor – 0.1uF
 Solar Panel – 5V
 Connectors
 Pot – 1K
 PCB

4. CIRCUIT DIAGRAM
Implementable Circuit Simulated circuit

5. PCB LAYOUT

6. PCB LAYOUTS (Contd.)
Bottom Copper Top Silk

7. 3D VISUALIZATION
Top View Bottom View

8. Implementation

9. Project Cost
 Solar Panel- 400 BDT
 PCB Fabrication – 90 BDT (Approx.)
 Rechargeable AA Battery – 80 BDT
 Connectors – 40 BDT
 Potentiometer – 30 BDT
 LM7805 – 15 BDT
 Capacitors – 5 BDT
 Diodes – 5 BDT
 Resistor – 5 BDT
Total Cost: 670 BDT

10. Reference
 "Solar Battery Charger Circuit using LM317 Voltage Regulator", Electronics
Hub, 2017. [Online]. Available: http://www.electronicshub.org/solar-battery-
charger-circuit/. [Accessed: 19- Aug- 2017].