A Solar Home System includes Solar PV, battery, and solar charge
controller. In most cases solar energy consumer use solar energy at
evening hours, but it is available in day time. So, it is required
to store solar energy into battery. A solar charge controller, or
charge regulator is similar to the voltage regulator. It regulates
the voltage and current coming from the solar panels and goes to
the battery. Most of the batteries are fully charged at 14 to 14.5
volts. On the other hand, battery's life time drastically reduces
due to the discharge over the level of 70%-80% DOD; at this
discharge level the battery voltage normally goes down to 11.5 0.2
volts. Each battery has certain limit of capacity. Battery lifetime
reduces due to overcharging and deep discharging. As battery is a
very expensive component of Solar Home System. So, it is essential
to protect the batteries from over charging and deep discharging.
In this case charge controller plays a vital role to protect this
battery. The research aims to study the design and implementation
of a low cost solar charge controller."
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