The purpose of this project was to design a portable and low cost power system that combines both wind electric and solar electric technologies. This system will be designed in efforts to develop a...
Brief Note About Battery Charger
Details how to build the world's most efficient battery charger for less than $5 in parts. Parts are readily available and the Capacitive Transformer concept is both easy to understand and b…Full description
Full description
Full description
Full description
Automatic Battery Charger
Full description
Full description
project report eee
Describes the theoretical design of a solar charger for mobile phones.Full description
This can be referred
battery
In this paper a converter called reconfigurable sunlight based converter RSC for photovoltaic PV battery applications is presented, particularl utility scale PV battery application. The fundamental idea of the RSC is to utilize a solitary force trans
Now a days, due to the problem of generation of electricity and consumption required is not sufficient so, solar generation system is essential. Nowadays, with generates electricity to match the required demand. So this paper is important. Here using
Solar Battery Charger With MPPT Using A Microcontroller
C.Suchetha
Photo Voltaic Cells Photo Voltaic cells are devices that generate electromotive force as a result of absorption of ionizing radiation.
Advantages of PV cells Direct conversion of solar radiation to electricity Reliable, Maintenance Free Quite, compatible Durable
Disadvantages of PV cells Low conversion efficiency High fabrication cost Continues supply is not possible
Three essential approaches to overcome the drawbacks Improving manufacturing process of solar arrays Controlling insolation input to PV arrays Utilization of output electric power of solar arrays
Conventional battery charging system
Maximum Power Point Tracking MPPT is an electronic tracking in which the controller compares the panel output with the battery input and pushes the operating point to the maximum power point. MPPT is used in PV systems to continuously tune the system so that it draws maximum power from the solar array irrespective of weather or load conditions.
Types of P & O Method Comparison with a constant reference value Incremental Conductance Method Feed Forward MPPT Controller
Present System An MPPT control system has been developed ,consisting a Buck converter which is controlled by a microcontroller based unit The main difference between this and existing methods is that the power output from the panel is directly used to control the converter output.
MPPT is more effective under these conditions Winter or cloudy days Cold weather Low battery charge
Block diagram
The block diagram consists of four blocks.
PV array Buck converter Battery Microcontroller
The PV array specification used in this project is as follows Maximum voltage: 35 volts Open circuit voltage: 44 volts Maximum current: 15 amps
A sealed lead acid battery is used in this project. The specification are Battery voltage : 24 volts Battery capacity : 150 Ah
Buck converter
ATMEL¶s ATmega 128L low-power consumption, CMOS microcontroller with built in EEPROM, FLASH memory, ADC, PWM generator is used. Advanced RISC Architecture 128K Bytes of In-System reprogrammable Flash In-System Programming by On-chip Boot Program
Schematic Diagram
Software Development Tools The tools used in developing this software WinAVR GCC compiler and AVR Studio 4 IDE for AVR series of microcontroller. The C program written is complied using the WinAVR GCC compiler. This compiler converts the C file to the file with extension .cof. This .coff file is used to build, simulate and debug the program using the AVR Studio 4. The AVR Studio 4 generates .hex file which is downloaded to microcontroller.
Main Program
MPPT Charge Function
Trickle Charge Function
The testing was done for three different conditions 1. Connection of the panel directly to the battery. 2. Connection of the panel to the battery through an ordinary charger. 3. Connection of the panel to the battery with MPPT.
Results From the results obtained the percentage of the power wasted the three different conditions is 23.8% when directly connected. 18.63% when connected through a ordinary charger. 11.38% when connected to a MPPT charger.
Conclusion The MPPT technique assures maximization of energy transfer to the battery bank. The battery lifetime is increased because the battery is operating at higher state of charge.
Future Extensions This design can be further be worked upon to include GSM for remote controlling of the load. This control system can be used for a grid connected system also.
