We came across an innovative Solar Charge based on 555 developed by Michael Davis. The best part of the design is that its so cost constrained/ Low Cost that any one in any place in the world can build this crcuit, especially developing countries like Bharat(India).
The site gives complete details of how the Circuit works and also what are the components used to build it. Here is a list of the Bill of Materials for this project:
IC1 – 7805 5 Volt positive Voltage Regulator
IC2 – NE555 Timer Chip
Q1 – 2N2222 Or Similar NPN Transistor
Q2 – IRF540 Or Similar Power MOSFET
R3, R4, R5 – 1K Ohm 1/8 Watt 10%
R6 – 330 Ohm 1/8 Watt 10%
R7 – 100 Ohm 1/8 Watt 10%
R1, R2 – 10K Multi-Turn Trim-Pots
PB1, PB2 – NO Momentary Contact Push Buttons
LED1 – Green LED
LED2 – Yellow LED
RLY1 – 40 Amp SPDT Automotive Relay
C1 – 0.33uF 35V 10%
C2 – 0.1uF 35V 10%
D1 – 1N4001 or similar
This would roughly cost around INR200 in Bharat(India). The next components needed are the Battery which might be slightly costly INR1000-4000 depending on the brand and the Capacity. Also the Solar Panels are are locally available in Bharat(India) at a cost of INR600-1500 range depending on the capacity requirements. The calculations for the Battery and the solar panel needed to processed to get the perfect charging time. There is good explanation on Michael’s Website.
Here is the Schematics:
The Circuit is simple enough to be build on the vero-board and enclose in the same manner as shownin Michael’s Website.
There is a nice video showing this innovation at work:
For More Information Visit the Website:
We congratulate Michael Davis on his simple and Innovative Creation !!