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16-02-2010, 07:56 AM
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solar car full report

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SOLAR CAR
Abstract
A solar car is a light weight, low power vehicle designed and built with a single purpose in mind - racing or "raycing", a combination of "race" and "ray" from the sun. It has limited seating (one or two people) and cargo capacity, can only be driven during the day and does not represent a practical means of transportation. It does, however, offer an excellent opportunity to develop future technologies that can be applied to practical applications.
The car operates by the collection and conversion of sunlight into electricity using solar cells mounted on the vehicle, which is then delivered to the car's batteries or motor. Generally, a car can operate on only 700-1500 watts of power, which is roughly the same amount of power used by a hair drier. With such small amounts of energy available, efficiency is crucial. Aerodynamic drag, weight, and rolling resistance all influence the car's design.
The objective of this seminar is to provide a general idea regarding the various components and working of the solar car.

SOLAR CARS
1. AN OVERVIEW
A solar car is a vehicle, which is powered by sun™s energy. A solar car is a light weight, low power vehicle designed and built with a single purpose in mind “ racing. They have limited seating (usually one, sometimes two people), they have very little cargo capacity, and they can only be driven during the day. It does, however, offer an excellent opportunity to develop future technologies that can be applied to practical applications.
Figure 1: Energy Flow Diagram of a Solar Car
The main component of a solar car is its solar array, consisting of photovoltaic cells, which collect the energy from the sun and converts it into
usable electrical energy. The energy is passed either to the battery for storage, or to the motor to run the car, though a device called power tracker, which convert it into the required voltage. The decision on whether to transfer the power to the motor or battery is made by a small onboard computer called the motor controller. It is responsible for sending the electricity smoothly to the motor when the accelerator is depressed, controlling the torque that goes to the motor such that the car maintains the desired speed. Some cars also use a process called regenerative braking, which allows some of the kinetic energy stored in the vehicleâ„¢s translating mass to be stored in the battery when the car is slowing down.
A solar car is made up of many components that have been integrated together so that they work as a single system. For the ease of explanation it has been broken down into five primary systems:
¢ Driver Controls & Mechanical Systems
¢ Electrical System
¢ Drive Train
¢ Solar Array
¢ Body and Chassis
2. DRIVER CONTROLS & MECHANICAL SYSTEMS
Solar cars do have some of the standard features found in conventional cars, such as turn signals (front & rear), brake lights, accelerator, rear view mirrors, fresh air ventilation, and usually cruise control. The drivers and passengers are protected safety harnesses and helmets. Drivers and passengers can look forward to uncomfortable seats, cramped positioning, and high cockpit temperatures as these cars have very few amenities for the driver.
2.1 REAR VISION:
Mirrors mounted to a car's exterior greatly increase aerodynamic drag; therefore, an out-of-the“box thinking is required to find a solution. SUNRUNNER, a solar car developed by the University of Michigan in 1995, utilized a fibre optic cable connecting an eyepiece in the driver's area to a lens located in an aerodynamic fin mounted on top of the canopy. MAIZE & BLUE, a later model developed by the University, on the other hand, chose an electronic system consisting of a miniature camera installed in the car's trailing edge and a pocket television in the driver's area. Some cars also have externally mounted mirrors of mirrors within a bubble canopy.
2.2 VENTILATION:
High temperatures are obviously bad for the driver (and passenger), but they are also bad for electrical and electronic components as high temperatures will generally reduce the efficiency and shorten the life of solar cells, batteries, motors, motor controllers and other electronic equipment.
Figure 2: The comfortable interior temperature and air flow rate as a function of outside temperature
Something like 10 kilograms of air would typically have to be provided every minute to approach passenger car comfort levels. Obviously, that's seldom feasible in a solar car due to the drag that it might impose on the vehicle, if such cooling flows are not also required by electrical, electronic and mechanical components of the vehicle.
Vehicle designers usually use the same airflow several times over as it passes through the vehicle; for example cooling driver, electronics, electrics and motor sequentially. Placing a sizeable air inlet at the forward stagnation point of the vehicle minimises drag due to the opening. 'NACA ductsâ„¢ are an alternative for getting air into the car if there's a reasonably-flat, external surface nearby that doesn't have significant divergent (or convergent) flow.
The mechanical systems of a solar car are designed to minimize friction and weight while maintaining the strength needed to handle the various road conditions. Lightweight metals like titanium and composites are commonly used to maximize the strength-to-weight ratio. It includes:
2.3 STEERING:
The major design factors for steering are reliability and efficient performance. The steering system is designed with precise steering alignment because even small misalignments can cause significant losses and increase tire wear. Different cars use different steering mechanisms depending on their budget and other considerations. The SUNRUNNER utilized a rack and pinion system that was attached to the steering arms by means of tie rods. TESSERACT, a single-seat high performance solar racecar, uses a centre mounted handlebars, much like that on bicycles that connect to a rack-and-pinion steering system.
2.4 BRAKES:
To maximize efficiency, the brakes are designed to move freely, eliminating brake drag, which is caused by brake pads rubbing against the brake surface. Hydraulic disc brakes are commonplace in solar cars because of their adjustability and good braking power. As a supplemental system, some teams have regenerative braking which allows some of the kinetic energy stored in the vehicleâ„¢s translating mass to be stored in the battery when the car is slowing down. Here the car's motor becomes a generator as regenerative braking is applied and adds energy to the batteries during deceleration. Both MAIZE& BLUE and SUNRUNNER had hydraulic disc brakes while only SUNRUNNER used regenerative braking.
2.5 SUSPENSION:
Of the available front suspension variants, MacPhearson struts or double A arms are most common in solar cars. A MacPhearson strut requires a large vertical clearance since it is positioned perpendicular to the ground. Double A arms require less vertical clearance, but consist of more components. Depending
upon the design a suitable one is chosen. The most common rear suspension is a trailing arm, similar to that found in motorcycles. Due to a single degree of motion, the trailing arm suspension allows for convenient packaging of dampers and the drivetrain.
2.6 WHEELS:
Wheels, however, are the least efficient part of a solar car due to rolling resistance. About one third of the energy used by a solar car is lost due to this factor. Due to this limitation, contact with the ground should be minimized.
Solar cars typically have three or four wheels. The common three-wheel configuration is two front wheels and one rear wheel (usually the driven wheel). Four-wheel vehicles are sometimes configured like a conventional vehicle (with one of the rear wheels being driven). Other four-wheel vehicles have the two rear wheels close together near the centre (similar to the common three wheel configuration).
Solar car wheel designs are similar to those of bicycle tires. Generally, the wheel's rims and hubs are aluminium while the spokes are made of steel. A Mylar film is placed over the spokes to increase aerodynamic efficiency. Pneumatic tires are preferred over solid rubber tires because they weigh less and provide a smoother ride. The best tires currently available are the Bridgestone Ecopia tires made for solar cars. They are very thin and operate at over one hundred pounds/inch pressure.
3. ELECTRICAL SYSTEM
The heart of a solar car is the electrical system, which is made up of batteries and power electronics. Power electronics include the peak power trackers, the motor controller, and the data acquisition system. The primary function of the power electronics is to monitor and control the electricity within the system.
3.1 BATTERIES:
A solar car uses the battery pack to store energy, which will be at a later time. The battery pack is made up of several individual modules wired together to generate the required system voltage. The types of batteries used include:
¢ Lead-Acid
¢ Nickel-Metal Hydride (NiMH)
¢ Nickel-Cadmium (NiCad)
¢ Lithium Ion
The NiCad, NiMH, and Lithium batteries offer improved power to weight ratio over the more common Lead-Acid batteries, but are more costly to maintain.
The battery pack is made up of several individual modules wired together to generate the required system voltage. Typically, teams use system voltages between 84 and 108 volts, depending on their electrical system. For example, Tesseract uses 512 li-ion batteries, broken down into twelve modules, which are each equivalent to a car battery, but only weigh 5 lbs each. Through an innovative pack design, the batteries are ventilated with even airflow to minimize temperature differences between the modules.
3.2 PEAK POWER TRACKERS:
The peak power trackers condition the electricity coming from the solar array to maximize the power and deliver it either to the batteries for storage or to the motor controller for propulsion. When the solar array is charging the batteries, the peak power trackers help to protect the batteries from being damaged by overcharging. Peak power trackers can be very lightweight and commonly reach efficiencies above 95%.
A maximum power point tracker (MPPT) is a DC-DC converter that matches the output of a PV string to the battery voltage in a way that maximises the power generated by the PV string.
The power generated by a PV string depends on the operating voltage. PV power increases steadily with operating voltage to a maximum, and then drops off rapidly as the voltage is increased further to the open-circuit voltage. A tracker allows the PV string to always operate at the most efficient point, independently of the battery voltage. For example, if your battery voltage is 100V and the ideal operating point for an array string is 2A x 120V = 240W, the tracker output will be 2.4A x 100V = 240W. In practice, there is always a small loss of 1-2% due to inefficiencies in the tracker electronics.
MPPTs are of three types:
¢ down (buck) converters, which convert the PV voltage to a lower battery voltage;
¢ up (boost) converters, which convert the PV voltage to a higher battery voltage; and
¢ dual (buck-boost) converters, which will convert either way, though usually with a penalty in efficiency.
3.2.1 FINDING THE MAXIMUM POWER POINT: There are two methods to find the maximum power point.
1. Open-circuit voltage tracking: The tracker periodically measures the open circuit voltage, VOC, of the PV string, then sets the operating voltage to Vmp = k VOC, where k is a constant. The method is simple, and reasonably effective. This method is used by AERL trackers.
2. Power tracking: The tracker measures changes in output power as it makes small changes to the operating point, and adjusts the operating point to maximise output power.
3.3 MOTOR CONTROLLERS:
This component performs the complex task of deciding how much current actually reaches the motor at a given time. This determination of current by the motor controller allows the car to accelerate, decelerate, or stay at a constant speed. The better motor controllers are up to 90% efficient.
3.4 TELEMETRY:
A team's telemetry system is used for data acquisition. A commercial or custom system monitors conditions such as speed, battery voltage, power collection and consumption, and motor temperature. The system then relays that information to the driver and team strategists. Most telemetry systems allow for two-way data transmissions and are based on microcontrollers and radio modems.
4. DRIVE TRAIN
The drive train will consist of the electric motor and the means by which the motor's power is transmitted to the wheel causing the vehicle to move. Due to the low amount of power generated (less than 5 hp) usually only one wheel in the rear of the car is driven by the electric motor. The motor types that have been used in solar cars include
¢ brushed DC motors
¢ DC brushless motors
¢ induction motors
DC brushless motors are commonplace in solar car racing. Rare-earth, permanent magnets mounted on the rotor, reacts to magnetic fields produced by the motor's windings. Three-phase windings allow the rotor remain at constant torque. A motor controller sends signals to the windings, regulating the magnetic field around the rotor. The most common type of motor used in solar cars is the dual-winding DC brushless. It is fairly lightweight and can reach efficiencies of 98% at their rated rpm.
The dual-winding motor is sometimes used as an electronic transmission. Switching between the dual windings changes the speed rating of the motor. The low speed windings provide high torque for starting and passing, while the high speed windings have higher efficiencies and are best for cruising.
There are several variations of two basic types of transmissions used in solar cars.
1. single reduction direct drive
2. variable ratio belt drive
3. hub motor
In the past, the most common type was the direct drive transmission where the motor is connected to the wheel through a chain or belt with a single gear reduction. This is a reliable and easily maintained transmission if special care is taken when aligning the components. Efficiencies above 75% can be achieved when designed properly.
For a variable ratio belt drive, gear ratio changes as the speed of the motor increases. This gives the motor more starting torque at lower speeds, but still allows the car to run efficiently at higher speeds. Variable belt drives require precise alignment and careful setup to work efficiently.
A hub motor eliminates the need for any external transmission because the motor shaft is connected directly to the wheel hub. This greatly increases the efficiency of the drive train and reduces the number of moving parts necessary to drive the wheel. A hub motor uses low rpm to account for the lack of gear reduction, which tends to drop their efficiency slightly, but they still can achieve efficiencies in excess of 95%.

5. SOLAR INSOLATION
The energy from the sun strikes the earth throughout the entire day. However, the amount of energy changes due to the time of day, weather conditions and geographic location. The amount of available solar energy is known as the solar insolation or irradiance and is most commonly measured in watts per meter squared or W / m 2.
Figure 3: Typical solar insolation for a sunny day.
Solar irradiance is generally modelled as having three components:
¢ direct beam irradiance,
¢ diffuse irradiance, from the sky, and
¢ reflected irradiance, from the ground.
The sum of these components is called global irradiance. The irradiance that will fall on a surface depends on the many factors, including:
¢ the day of the year
¢ the position of the sun in the sky
¢ the inclination of the surface
¢ cloud cover.
These factors should be taken into account while designing the solar array.
6. SOLAR ARRAY
Solar cells or photovoltaics collect the energy from the sun and converts it into usable electrical energy. They are made from silicon by joining an n-type and a p-type silicon semiconductor, creating an electron rich and an electron poor layer. When sunlight strikes the cell, photons cause atoms of the semiconductor to free electrons, leaving behind positive charges. The flow of electrons thus created constitutes an electromotive force that drives the current to charge a battery or power a motor.
The cell's positive contact is on the bottom while the negative contact, or bus bar, is located on the top of the cell. Each cell produces approximately .5 volts and 3 amps of current. Connecting the cells in series, i.e., positive to negative, increases voltage. Parallel connections, i.e., negative to negative and positive to positive, increase current. Therefore, connecting the cells in various series and parallel configurations produces modules of different voltages and currents.
Figure 4: Schematic Diagram of a Solar
Figure 5: Solar Cell Diagram
Cells can be grouped into space grade and terrestrial grade categories:
¢ Space grade cells are up to 29% efficient, and are used mainly in satellite production due to their high cost. These high efficiency cells cost in excess of $500 per square inch.
¢ Terrestrial grade cells having a efficiency of 14%, are much cheaper causing them to be the cells of choice for solar cars. Each cell measures 10cm x 10cm, costs approximately $6.00, and produces 1.5 watts of power.
A large number of solar cells are wired together to form a solar array. The entire solar cells together form the solar array. Solar cells should also be divided into several zones. For example, if you have 750 solar cells, you might want to wire 3 sets of 250 cells, each zone producing about 125 volts. If one zone fails, two other zones are still producing power. SUNRUNNER'S array consisted of 14,057 razor blade sized, 16% efficient space grade cells.
The cells are extremely fragile. So many engineers put them through a process called encapsulation. Doing so strengthens solar cell durability, but decreases the efficiency. Encapsulation is the process of coating the cells with a tougher material like resins or sandwiching it between two sheets of fibre glass,
which prevents the cells from being damaged. For cells 14% efficient, encapsulation would reduce the overall efficiency to12.5%.
6.1 PRACTICALPROBLEMS WITH USING SOLAR CELLS
6.1. 1 I-V CURVES AND SERIES MISMATCH:
All silicon solar cells put out a voltage of about 0.5V. This is because they're a kind of diode, and this is analogous to the forward break over voltage of the diode. Now, if you have several cells in series and they're all the same they'll all give the same current, and the voltage from all the cells will add up neatly. But they're not all the same. The silicon is doped very subtly differently from cell to cell, or the purity of the silicon varies, or different cells are at different temperatures. Ss some cells will give more current than others. In a series string, they can't because all the cells are constrained to give exactly the same current. This will cause many of our cells to run sub-optimally. So after the cells are tabbed, they are measured, and grouped like with like.
6.1. 2 CURVED ARRAYS:
The next hazard is curves on the array. Many arrays are not perfectly flat, which means that not all cells are receiving the same amount of sunlight. They have to be arranged in such a way that all the cells in the strings receive approximately the same illumination. A common way to achieve this would be to run each string parallel to the long axis of the car, so that all the cells in a string are pointing in approximately the same direction. Several strings are often wired together to form a section or panel that has a voltage close to the nominal battery voltage.
6.1. 3 SHADOWS AND BROKEN CELLS:
Sometimes there will be shadows on the array. This could be caused by the driver bubble, or by trees or other obstructions near the road, or by passing traffic. When a cell in a string is shaded, its output goes down. Since the other cells continue to force current through it, this cell actually dissipates power instead of generating, and it gets dissipated as heat. Now that this cell is warmer, it's less efficient than the others, and so even when the light comes back, it'll want to generate less current, which means it'll wind up dissipating some power as heat. This is called Thermal runaway. This is prevented in the following way:
Every cell (or, more often, every small group of cells) has a diode across it. When a cell in that group is shaded, current flows through the diode. If you have 60 cells in your string, and they're in groups of 6, then when a single cell is shaded, your output voltage will drop by 10%, as the bypass diode for that group comes into play, and your current output will drop not at all. This is better than having your voltage drop 0.6V for the dark cell, and having your current output drop by some large amount, as current is forced through the dark cell.
The other time that the bypass diodes come in handy is when a cell gets damaged. This may be due to a stone being flicked up from the road, a camera falling out of someone's pocket or a small child running up the array. The damaged cell may go open-circuit, meaning that without the bypass diode, output from the string would drop to zero. With the bypass, output drops only proportionately to the percentage of cells bypassed.
6.2 LIMITATIONS:
To put the limitations of a solar car in perspective, a simple calculation will suffice. Only 1000 W/m2 of energy reaches the earthâ„¢s surface in an hour of peak sun. This term can be thought of as the amount of sunlight that reaches a sunny area on cloudless, summer day around noon. An average solar array configuration span 8m, meaning the total amount of energy hitting the solar car during peak sun is 8KWh/m2. Of this energy, average solar cells are only able to convert 12.5% to electricity. As a result, the total amount of converted energy available to a car consists of 1 KW/h, approximately the same amount of energy used to run a hairdryer.
With cars running on 700-1500 Watts, efficiency is hypercritical. Therefore, advances in all aspects of engineering, from mechanical to electrical to materials and computer science are the key. The three primary areas of energy loss consist of aerodynamic drag, braking, and rolling resistance. To minimize aerodynamic drag, engineers make solar cells as sleek as possible. Rolling resistance is proportional to weight. Hence solar cars should be engineered to be very light.

7. BODY & CHASSIS
The most distinctive part of solar cars is their bodies. The sleek and exotic shapes are eye catching. The main goals when designing the body are to minimize the aerodynamic drag, maximize the exposure to solar insolation, minimize weight, and maximize safety.
Figure 6: Body and Chassis of a Solar Car
7.1 BODY SHAPES
Although cars differ in design, their shapes can be grouped into four categories. A unified aero body and panel allows for a small frontal area, low weight, and a wide range of visibility around the canopy. Fixed or tilting, flat panels with a separate driver cab are simple, lightweight, and inexpensive to construct; however, aerodynamic efficiency is compromised due to exposed suspension components and vulnerability to cross winds. Catamaran shapes offer reduced frontal area and low aerodynamic drag. For north/south race routes, the curved array becomes very powerful in the early morning and late afternoon as the sun travels across the horizon. Finally, are uniquely designed vehicles whose aerodynamic efficiency and power collection capabilities differ from design to design. MAIZE & BLUE and SUNRUNNER were catamaran shaped.
Figure 8: Body shapes of common solar cars
7.2 CHASSIS
Generally, there are three types of chassis used in solar cars:
1. space frame
2. semi-monocoque or carbon beam
3. monocoque
A space frame uses a welded tube structure to support the loads and the body. The body is a lightweight, non-load bearing, composite shell that is attached to the chassis separately. The semi-monocoque or carbon beam chassis uses composite beams and bulkheads to support the loads and is integrated into a non-load bearing composite belly pan. The top sections of the car are often separate body pieces that are attached to the belly pan. A monocoque chassis uses the body structure to support the loads. Many solar cars use a combination of the chassis categories mentioned above. The image above is an example of a semi-monocoque chassis with an integrated space frame used to protect the driver.
8. MATERIALS USED
A composite material is the combination of a filler material sandwiched between layers of a structural material. Carbon fibre, Kevlar and fibreglass are common composite structural materials. Honeycomb and foam are common composite filler materials. These materials are bonded together using epoxy resins and in the cases of Kevlar and carbon fibre, can obtain impressive strengths (equal to steel) but remain very lightweight. SUNRUNNER used Kevlar as the fabric with a Nomex honeycomb spacer while MAIZE& BLUE used carbon fibre fabric.
9. FALLING SHORT
There are several characteristics that a commercially viable car must have. Commercial cars typical can hold at least 4 passengers. It must be extremely reliable, comfortable, and be able to function on its own. It must also be able to maintain the required speed. In addition, commercial cars typically have amenities such as air conditioning, radio, and power locks and windows. Solar vehicles when driven on highways, experienced many flat tires and often were incapable of maintaining highway speeds of fifty-five miles per hour. With the energy available to solar cars, the type of amenities described above is impossible. The car is also a very cramped one. Hence it failed to break into the commercial car market as of now
10. THE FUTURE
10.1 IN THE SHORT TERM
One plausible market for solar vehicles is a terrestrial application of the rovers that NASA uses in space for data collection in a hot, sun rich area where manual labor is difficult. The vehicles would recharge autonomously, and the driverâ„¢s discomfort would not be an issue because there would not be a driver. In addition, these vehicles could be kept lightweight and simple without a need for too many amenities.
10.1.1 CARRY-OVER OF EXPERTISE:
The solar car rush brought substantial advances to the design of electric vehicles, starting with the use of solar power. It led to better motors, better use of batteries, and better motor controller design which have been adopted by some electrical vehicle manufacturers.
10.1.2 COMPOSITE HULL CAR:
Another key area that has been charging ahead is the composite hull car. Composites were not only lighter, but they also made cars safer than their steel counterparts.
10.1.3 HARNESSING SOLAR POWER
Solar cars also helped spread the word about the use of harnessing solar power. By spreading the word about solar energy in this exciting way, the cars contributed to the rise in the use of solar cells for other, more practical uses. Lastly, it created a sport that has an educational as well as a social benefit.
10.2 IN THE LONG RUN
Whatever be its limitations, the future is definitely full of promise for the solar cars. It took us about a hundred years after electricity was invented, to develop a commercially viable electric vehicle. Similarly solar cars too need a suitable incubation period, to successfully foray into the commercial vehicle segment.
With the crude prices hitting upwards of $50 a barrel and still looking bullish, it is certain that the current preference for petroleum based automobiles will change in the not too distant future. The solar car with no fuel expenses will certainly be preferred for short distance commutation in the future. Though it may offer only a significantly reduced performance compared to the conventional vehicle it will then be looked upon as a cost effective option.
Also, there are many areas of the solar car, which can be improved upon, starting with the solar array. At present the solar array is only 12.5% efficient. What would be the case if it were made atleast 50% efficient Iâ„¢m sure that much of the current problems in solar cars can be overcome.
CONCLUSION
The solar cars are used exclusively for racing in tournaments, at present. Though they have been around for about twenty five years now, the technology is still in the developmental stages. Hence they can not be used as a practical means of transport. The challenge lies in making it a viable means of transport. Further research is needed in this regard to improve solar panels, reduce weight, to improve reliability and to reduce the cost. Research is being carried out on many semi-conductors and their alloys to develop more efficient solar cells. It can be safely assumed that with the advent of mass production there would be greatly reduced. Thus this technology will definitely live up to its potential some time in the future.
REFERENCES
1. http://www.americansolarcarchallenge.org
2. http://www.solarcar.mcmaster.ca
3. http://www.formulasun.org
4. http://scg.levels.unisa.edu.au/src/pmwiki.php
5. http://www.raccoon.com/~cpraven/thesis/
6. http://www.umr.edu/~dougc/solar/sun.html
7. http://web.umr.edu/~wif/experimental/Bei...evlar.html
8. http://sunsite.anu.edu.au/questacon/aimscc_main.html
9. http://www.wikipedia.com

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19-10-2010, 04:58 PM
Post: #2
RE: solar car full report

.ppt  SolarCar.ppt (Size: 356.5 KB / Downloads: 343)
How solar array change sunlight to usable energy


First thing the solar array collect sunlight together.
When sunlight is collected together. It immediately change the sunlight to electricity.
Next step is to the power tracker.
23-04-2011, 12:14 PM
Post: #3
RE: solar car full report

.docx  mechanical project'solar vehicle'.docx (Size: 618.46 KB / Downloads: 231)
ABSTRACT
The project is solar vehicle we are using a solar energy as a source of energy in our project.
Nowadays, we are experiencing an electricity scarcity we are experiencing a Lead in shortage too. So the battery manufacturing cost and resulting end user prices are sky high also a shortage of batteries in the market. We are also experiencing a hike in fuel prices considerably, is bound to go on as time pass by as soon we will be shortage of fuel too. There is an emphasis on using fuel appreciably but nobody is taking care of it.
But we are at least taking the consideration of it and with this we are trying to put a novel concept in the market.
Government is also promoting the use of renewable energy in each of every operation. The biggest option to replace the conventional theory of fuel operation, can be replaced by the battery based theory, is environment friendly too.
The only problem associated with the battery based technique is it needs to be recharged and the charging time is considerable high.
So it can’t replace the fuel completely, if we are thinking of using the battery based vehicle for conveyance. The other problem associated with the battery vehicle is the battery weight takes the maximum weight of the total weight of the vehicle.
So it needs to be reduced because it directly affects the performance of the vehicle. As due to more weight its mileage will be on shorter side due to maximum weight, if we reduce the weight the mileage will improve many folds easily in one charge.
The fact is the battery charging is done using the electricity so in all sense we are using electricity. We are eliminating these necessities to some extend, As in our vehicle we are using the solar energy for operation as we are blessed with at least 300 days a total sunlight.
And we are using the Capacitor as a source of storage of charge rather than the battery, this in effect will reduce the dead weight of the vehicle and reduce the weight of the vehicle considerably and improve the performance but we are not using the battery so we are using the solar panel to power the motor used in the vehicle and the capacitor bank as a source of temporary storage. We will have a system which will continuously scan the capacitor bank and charging the capacitor bank and the charge is discharged into the motor directly. As the charge is stored momentarily the wattage requirement reduces considerably and yielding a better result.
1. INTRODUCTION
The unique feature of the vehicle is being solar operated system, but it does not use battery to supply the motor, instead it uses capacitor banks there are four different capacitor banks used in this system, where there banks are switched one by one using the high frequency switching through the microcontroller.
Many specifications must to know about solar car from solar array , motor, capacitor bank and so on each specification has theory and calculation to mate it function correctly & able to move perfectly. The most important things id\s the capacitor bank because before this there is no solar car driven by a capacitor bank. This project a lot depends on capacitor bank because it using influence if the solar car can drive or not.
Using brain storming techniques to generate ideas , several initial design may be consider a common place to start is with the shape of the car since it will dictate the design of many other system initial designing concept are also developed for chassis design mechanical system design electric system design, driving train design& solar array design that show promise are investigated further so that design can be compare through trade of studies the concept must be eliminated until a final design can be agreed upon there are many factors to consider to each design, for example:
Weight
Efficiency
Speed
Basically research about capacitor bank to drive a solar car was a something new. Success do not depends on question that will answer it later from the research this research is carried out to get an answer for the question as follows.
a) How to build a solar car with capacitor bank? In this research author will built a proto type to improve the fact.
b) How a capacitor bank can drive a solar car? Connection between capacitor bank and motor is important thing.
Knowledge about solar array also important because the array is made up of many photovoltaic solar cell that convert sun energy into electricity .the cell types & the dimensions of the array depends on the vehicle size and class.
More over knowledge about drive train in solar car is very different from that a conventional car. Throw this project the drive trains consist of electric motor & the means by which the motor power is transmitted to the vehicle to move.
This project is to design a solar capacitor bank powered vehicle with objective as follows:
a) To design use photovoltaic source of power.
b) To fabricate & assemble a working proto type model.
This project is more focus on solar capacitor bank powered vehicle. The scope of this project is as follows:
a) Selection of solar panel.
b) Selection of capacitor bank.
c) Selection of chassis, selection of motor etc.
2. LITERATURE SURVEY
2.1. Solar Cars

The first solar car invented was a tiny 15-inch vehicle created by William G. Cobb of General Motors. Called the Sun mobile, Cobb showcased the first solar car at the Chicago Powerama convention on August 31, 1955. The solar car was made up 12 selenium photovoltaic cells and a small Pooley electric motor turning a pulley which in turn rotated the rear wheel shaft. The first solar car in history was obviously too small to drive as shown in fig.2.1.
Now let's jump to 1962 when the first solar car that a person could drive was demonstrated to the public. The International Rectifier Company converted a vintage model 1912 Baker electric car (pictured above) to run on photovoltaic energy in 1958, but they didn't show it until 4 years later. Around 10,640 individual solar cells were mounted to the rooftop of the Baker to help propel it.
In 1977, Alabama University professor Ed Passereni built the Bluebird solar car, which was a prototype full scale vehicle. The Bluebird was supposed to move from power created by the photovoltaic cells only without the use of a battery. The Bluebird was exhibited in the Knoxville, TN 1982 World's Fair. [2]
Between 1977 and 1980 (the exact dates are not known for sure), at Tokyo Denki University, professor Masaharu Fujita first created a solar bicycle, then a 4-wheel solar car. The car was actually two solar bicycles put together.
In 1979 Englishman Alain Freeman invented a solar car (pictured right). He road registered the same vehicle in 1980. The Freeman solar car was a 3-wheeler with a solar panel on the roof.
At the engineering department at Tel Aviv University in Israel, Arye Braunstein and his colleagues created a solar car in 1980 (pictured below). The solar car had a solar panel on the hood and on the roof of the Citicar comprised of 432 cells creating 400 watts of peak power. The solar car used 8 batteries of 6 volts each to store the photovoltaic energy. [5]
The 1,320 pound solar Citicar is said by the engineering department to have been able to reach up to 40 mph with a maximum range of 50 miles.
In 1981 Hans Tholstrup and Larry Perkins built a solar powered racecar. In 1982, the pair became the first to cross a continent in a solar car, from Perth to Sydney, Australia. Tholstrup is the creator of the World Solar Challenge in Australia.
In 1984, Greg Johanson and Joel Davidson invented the Sunrunner solar race car. The Sunrunner set the official Guinness world record in Bellflower, California of 24.7 mph. In the Mojave Desert of California and final top speed of 41 mph was officially recorded for a "Solely Solar Powered Vehicle" (did not use a battery). The 1986 Guinness book of world records published the official records.
The GM Sunraycer in 1987 completed a 1,866 mile trip with an average speed of 42 mph. Since this time there have been many solar cars invented at universities for competitions such as the Shell Eco Marathon. There is also a commercially available solar car called the Venturi Astrolab. Time will only tell how far the solar car makes it with today’s & tomorrow’s technology. Solar cars combine technology typically used in the aerospace, bicycle, alternative energy and automotive industries. The design of a solar vehicle is severely limited by the amount of energy input into the car. Most solar cars have been built for the purpose of solar car races. Exceptions include solar-powered cars and utility vehicles.
Solar cars are often fitted with gauges as seen in conventional cars. In order to keep the car running smoothly, the driver must keep an eye on these gauges to spot possible problems. Cars without gauges almost always feature wireless telemetry, which allows the driver's team to monitor the car's energy consumption, solar energy capture and other parameters and free the driver to concentrate on driving.Solar cars depend on PV cells to convert sunlight into electricity. In fact, 51% of sunlight actually enters the Earth's atmosphere.[3]
Unlike solar thermal energy which converts solar energy to heat for either household purposes, industrial purposes or to be converted to electricity, PV cells directly convert sunlight into electricity. When sunlight (photons) strike PV cells, they excite electrons and allow them to flow, creating an electrical current. PV cells are made of semiconductor materials such as silicon and alloys of indium, gallium and nitrogen. Silicon is the most common material used and has an efficiency rate of 15-20%. Of late, several consulting companies, such as Phoenix Snider Power, have started offering technical and financial services to institutes and teams developing solar cars worldwide
During the 1990s, regulations requiring an approach to "zero emissions" from vehicles increased interest in new battery technology. Battery systems that offer higher energy density became the subject of joint research by federal and auto industry scientists. Solar cars were first built by universities and manufacturers. The sun energy collector areas proved to be too large for consumer cars, however that is changing. Development continues on solar cell design and car power supply requirements such as heater or air-conditioning fans.[4]
July 2007 marks the 24th anniversary since Joel Davidson and Greg Johanson set The First Guinness World Record for a 100% solar powered vehicle (no batteries). In 1986, the vehicle was retired and taken apart, but the solar array is still producing electricity for an off-grid home.
2.2. History of Photovoltaic Cell
Photovoltaic system converts sun light into electricity. The term "photo" is a stem from the Greek "photos," which means "light." "Volt" is named for Alessandro Volta (1745-1827), a pioneer in the study of electricity. "Photo-voltaic," then, could literally mean "light-electricity." Most commonly known as "solar cells," PV systems are already an important part of our lives. The simplest systems power many of the small calculators and wrist watches we use every day. More complicated systems provide electricity for pumping water, powering communications equipment, and even lighting our homes and running our appliances. In a surprising number of cases, PV power is the cheapest form of electricity performing these tasks.[7]
Photovoltaic cells converts lightr energy into electricity into atomic level. Although first discovered in 1839, the process of producing electric current in a solid material with the aid of sunlight wasn't truly understood for more than a hundred years. Throught the second half of the 20th century, the science has been refined and the process has been more fully explained. As a result, the cost of these devices has put them into the mainstream of modern energy producers. This was caused in part by advances in the technology, where PV conversion efficiencies have improved considerably'.
French physicist Edmond Becquerel first described the photovoltaic (PV) effect in 1839, but it remained a curiosity of science for the next three quarters of a century. At only 19, Becquerel found that certain materials would produce small amounts of electric current when exposed to light. The effect was first studied in solids, such as selenium, by Heinrich Hertz in the 1870s. Soon afterward, selenium PV cells were converting light to electricity at 1% to 2% efficiency. As a result, selenium was quickly adopted in the emerging field of photography for use in light measuring devices. Major steps toward commercializing PV were taken in the 1940s and early 1950s, when the Czochralski process was developed for producing highly pure crystalline silicon. In 1954, scientists a t Bell Laboratories depended on the Czochralski process to develop the first crystalline silicon photovoltaic cell, which had an efficiency of 4%. The term "photovoltaic" comes from the Greek φῶς (phōs) meaning "light", and "voltaic", meaning electric, from the name of the Italian physicist Volta, after whom a unit of electro-motive force, the volt, is named. The term "photo-voltaic" has been in use in English since 1849.
The photovoltaic effect was first recognized in 1839 by French physicist A. E. Becquerel. However, it was not until 1883 that the first photovoltaic cell was built, by Charles Fritts, who coated the semiconductor selenium with an extremely thin layer of gold to form the junctions. The device was only around 1% efficient. In 1888 Russian physicist Aleksandr Stoletov built the first photoelectric cell (based on the outer photoelectric effect discovered by Heinrich Hertz earlier in 1887). Albert Einstein explained the photoelectric effect in 1905 for which he received the Nobel prize in Physics in 1921. Russell Ohl patented the modern junction semiconductor solar cell in 1946, which was discovered while working on the series of advances that would lead to the transistor.
The modern photovoltaic cell was developed in 1954 at Bell Laboratories. The highly efficient solar cell was first developed by Daryl Chapin, Calvin Souther Fuller and Gerald Pearson in 1954 using a diffused silicon p-n junction. At first, cells were developed for toys and other minor uses, as the cost of the electricity they produced was very high - in relative terms, a cell that produced 1 watt of electrical power in bright sunlight cost about $250, comparing to $2 to $3 for a coal plant.
Solar cells were rescued from obscurity by the suggestion to add them to the Vanguard I satellite. In the original plans, the satellite would be powered only by battery, and last a short time while this ran down. By adding cells to the outside of the fuselage, the mission time could be extended with no major changes to the spacecraft or its power systems. There was some skepticism at first, but in practice the cells proved to be a huge success, and solar cells were quickly designed into many new satellites, notably Bell's own Telstar.
Improvements were slow over the next two decades, and the only widespread use was in space applications where their power-to-weight ratio was higher than any competing technology. However, this success was also the reason for slow progress; space users were willing to pay anything for the best possible cells, there was no reason to invest in lower-cost solutions if this would reduce efficiency. Instead, the price of cells was determined largely by the semiconductor industry; their move to integrated circuits in the 1960s led to the availability of larger boules at lower relative prices. As their price fell, the price of the resulting cells did as well. However these effects were limited, and by 1971 cell costs were estimated to be $100 a watt.
02-10-2011, 10:22 PM
Post: #4
RE: solar car full report
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03-10-2011, 09:33 AM
Post: #5
RE: solar car full report
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