Help with Solar UPS for College Project?
For our college project, we decided to make a small scale solar UPS that would be used to light up an LED lamp. The Led requires a voltage of 3.1V and a Direct Current of about 5 mA. We decided to connect 3 small pencil rechargeable cells in series that gives a voltage of 1.2V at 600 mAh each. Now, we need to connect the solar panel in a way that it is able to charge this battery setup(3 pencil cells connected in series). Can anyone help us out with the circuit diagram for the same? Also, we were looking for a logic switch that could detect and prevent the flow of charges from Solar panel to the Battery setup when the battery setup is fully charged.
This is for a team of engineering majors? and you need help for this?
3 cells in series will provide 3.6v.
Connect a resistor in series with the led across this voltage.
if the led drops 3.1v, you will have 0.5v across the resistor.
To set led current at 5ma R=E/I =0.5/0.005 = 100 ohms.
Now get a solar cell or connect up solar cells to get a voltage of about 5VDC
go to Radio shack and get a voltage regulator I.C. that you can set to 3.6VDC out
once the batteries are charged they will stop receiving current.
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