- A thermally Insulated box (hard thermocol)
- A fan ( 3.5 W, 6V )
- Solar Panel ( 8V )
- Lead Acid Battery ( 4.5 Ah)
- Signal Conditioning Circuit
- PVC pipe
- The fan and the PVC pipe are mounted on the upper surface of a thermally insulated box ( made of thermocol )
- The voltage output from the solar panel is connected to a charge controller to regulate the voltage input to the battery
- The lead acid battery is charged and gives supply to the fan
- The fan blows in air through the ice compartment
- While the new air enters the compartment, it displaces the air that is cooled in the cooling compartment.
- The displaced air ( cold ) flows out and cools the surroundings
- This causes temperature drop in the surroundings, and thus acts as an air cooler
- This is a simple battery charge controller that can be used in situations where the input voltage varies widely. Typically a solar panel’s output is dependent upon the amount of sunlight that falls on it. This, of course, varies from morning to evening.
- The above Circuit Diagram will help our battery to get charge . because the voltage through the solar pannel is not stable . But to charge the battery faster we need the stable voltage .
Working Of Circuit Diagram :
- Here the dotted box marked X is a simple voltage regulator that gives an output voltage of about 7 Volts – the 5K preset has to be adjusted to achieve this. The input voltage from the solar panel is assumed to vary from about 8 Volts to about 11 Volts. The charging current is about 05A. The “discharged” battery voltage should be about 5.5 Volts. The dotted box marked Y is a simple circuit that prevents over charging. This is done by sensing the battery voltage – when this crosses about 6.5 volts (adjusted by t 10K preset) Q4 turns on thereby diverting the drive from Q1-Q2 Q5 and Q6 are diode connected transistors (two silicon diodes, such as 1N4848/1N4001 can also be used in their place) that provides a reference voltage of about1.3 Volts.
- Connect the solar panel to the input (or a voltage source of about say 9 Volts)
- Adjust the 5K preset so that the output voltage is about 7 Volts.
- Move the 10K preset slider to ground
Solar Panel ( 8V )
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