Presenting here three circuits to make efficient Battery chargers. The 12 volt Lead Acid Car battery requires high current for fast charging. If we provide high current, the battery will charge within 1-2 hours fully. Usually a Lead Acid battery takes high current initially, which drops to 500 mA or less after 10-20 minutes. As a rule, it is advisable to charge the battery with a current that is 10 times lesser than the battery capacity. The Car battery is 32 Amps or 45 Amps so it requires 3.2 Ampere and 4.5 Ampere current respectively. So the charger should provide 14 volts with a current of 5 Amperes.
This circuit protects home appliances from low voltage. When the voltage in the AC lines drop below the normal voltage, the circuit cut off power to the appliance and keep it off till the normal voltage resumes. This gadget is useful to protect appliances like Fridge which may over heat if the line voltage drops below 180 volts. Voltage drop also increases the current consumption in Fridge due to over stress on the compressor.
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