The aim of this work is to design a solar power based micro inverter for standalone PV applications using PIC Microcontroller and H-Bridge inverter. In this novel MPPT algorithm and DC-DC boost converter is uses to optimize the solar panel energy production. The control strategy here is designed and accomplished by employing PIC16f72 microcontroller which is user friendly and cost-effective solution. Maximum Power Point Tracking, frequently referred to as MPPT, is an electronic system that operates the Photovoltaic (PV) modules in a manner that allows the modules to produce all the power they are capable of. MPPT is not a mechanical tracking system that “physically moves” the modules to make them point more directly at the sun. MPPT is a fully electronic system that varies the electrical operating point of the modules so that the modules are able to deliver maximum available power. In the proposed converter, the input DC voltage can be boosted by the boost converter and this boosted voltage is stored into the rechargeable battery and then interfaced with the H-BRIDGE inverter circuit. The battery supply is fed to pulse generator and in turn to a MOSFET which is capable of generating ON/OFF pulses of different frequencies using PWM technique. This is fed to a step-up transformer to generate a low voltage AC to the grid. This AC is fed to loads like bulbs, devices. The main controlling device of the whole system is PIC Microcontroller. Solar panel, DC-DC converter, inverter and load are interfaced to PIC Microcontroller. The PIC Microcontroller initially measures the voltage from solar panel. The Microcontroller takes the decision of operating the load through PWM (Pulse Width Modulation) until the maximum voltage is obtained from solar panel without degrading the load performance. To perform this intelligent task, Microcontroller is loaded with an intelligent program written using embedded ‘C’ language.    

The main objectives of the project are:

1. Bringing out maximum energy from solar panel without mechanical tracking.
2. Usage of DC-DC converter circuit
3. Inverter based AC load control
4. MOSFET based switching circuitry
5. PWM (Pulse Width Modulation) usage.

    The major building blocks of this project are:  

1. Regulated power supply.
2. PIC Microcontroller.
3. Solar panel.
4. DC-DC boost converter.
5. H-BRIDGE Inverter.
6. MOSFETs
7. Battery
8. Crystal
9. Reset button.
10. LED Indicators.
11. AC load.

      Software’s used:  

1. PIC-C compiler for Embedded C programming.
2. PIC kit 2 programmer for dumping code into Micro controller.
3. Express SCH for Circuit design.

      Block diagram:      

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