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1. SMART SOLAR HOME SYSTEM WITH SAFETY DEVICE LOW
VOLTAGE ALERT
Abstract:
In developing countries the shortage of power is huge according to the demand. Due to
power crisis other different problems also arise in these countries. As power is related to each
and every sector of the country, this problem should be rectified on emergency basis. This power
crisis problem cannot be solved overnight. But full utility of resources can be ensured. Hence
using renewable sources of energy has gained eyes on it. One of the commonly available
renewable energy sources is solar power. But solar power is not equally distributed throughout
the world. Also in a particular place, the solar energy is not equally available throughout the day.
Hence using this source leads to low voltage problems at times. This paper here discusses on the
same problem devising a solution for the same.
Existing system:
In the existing system the load is made to run by directly applying the solar power. The
disadvantage here is that the solar output varies constantly which may lead to the damage of
loads.
Proposed system:
In the proposed system, the power obtained from the solar panel is stored using a battery.
The battery voltage levels are monitored using PIC Microcontroller and the voltage level is
displayed in LCD. If any abnormality such as low voltage is encountered, the load is tripped OFF
using a relay circuit and an alarm is raised to indicate the status abnormality.

2. Block Diagram:
Power
Supply
LCD
PIC
Relay
Driver
DC
Motor
Battery
Solar
Panel
16F877A
ALARM
Micro
Controller
Hardware requirements:
 PIC16F877A Microcontroller with Power Supply
 6V Solar Panel
 Battery
 LCD
 Relay driver
 DC Motor
 Buzzer
Software requirements
 Embedded c
 MPLab Compiler or CCS Compiler

3. Advantages
 Damage due to higher current rating is prevented.