Solar power is a good and clean source of electricity.But before it is used in houses, it is first used to charge battery then the battery, with the help of inverter circuits, will power up household appliances like lights and TV sets.
During hot sunny days, solar panels can generate voltage above 14V dc or higher , enough to charge a 12V lead-acid battery. But during cloudy days, solar panels can generate voltages even less than 9V to 8V, which is very low enough to charger a 12V battery. In short, during this days, solar panels are useless.
The purpose of this project is to design a low cost (cheap) and simple solar battery charger that has a built in charging controller and regulator that can maximize the solar panels charging capacity and at the same time help the battery charging process continuous regardless the weather is sunny or cloudy.
The project uses a 555 timer IC to generates pulses of voltages at a specified duty cycle and frequency. This generated voltage will be feed to the input of bipolar junction transistor and as a result generates an output voltage which is enough to charge the battery. This operation is similar to 3V charger project. The circuit also has comparator IC that monitors charger output voltage and controls the charger off when the battery is fully charge. The comparator also controls the output to more than 13.6V (15V) to ensure proper and continuous battery charging. The project also has an output regulator that limits the output voltage acceptable to battery charging.The charger project also has a voltage output indicator and a diode to avoid battery charge draining.
from: electronician.blogspot.com
related projects
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solar cell phone charger circuit
AA Battery Solar Charger
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