Design Of 5kVA Solar Inverter For Off-Grid Location

DEDICATION

This project is dedicated to Almighty God for his protection, kindness, strength over my life throughout the period and also to my — for his financial support and moral care towards me.Also to my mentor — for her academic advice she often gives to me. May Almighty God shield them from the peril of this world and bless their entire endeavour Amen.

ACKNOWLEDGEMENT

The successful completion of this project work could not have been a reality without the encouragement of my — and other people. My immensely appreciation goes to my humble and able supervisor Mr. — for his kindness in supervising this project. My warmest gratitude goes to my parents for their moral, spiritual and financial support throughout my study in this institution.
My appreciation goes to some of my lecturers among whom are Mr. —, and Dr. —. I also recognize the support of some of the staff of — among whom are: The General Manager, Deputy General manager, the internal Auditor Mr. — and the —. Finally, my appreciation goes to my elder sister —, my lovely friends mercy —, —, — and many others who were quite helpful.

ABSTRACT

Solar energy has incredible potential to power our daily lives. Researchers suggest that the amount of sunlight that strikes the Earth’s surface in an hour and a half is enough to handle the entire world’s energy consumption for a full year.

Solar power system is one of the best renewable energy technology which is not only cost effective but environment friendly as well. For my research, I have suggested methodologies that may be applicable to other off grid applications. I will be explaining design methodology using an example of an off-grid bus shelter. Off-grid or standalone systems can be defined as independent systems that are not connected to any electrical grid. These come in different sizes and are mostly used in location where there is little access to grid infrastructure.

The off-grid bus shelter project will completely depend on the solar energy i.e. solar photovoltaics will harvest electricity to supply the devices such as lighting LED, Wi-Fi router and advertising billboard. A battery backup would be used as a continuous power supply in case of the worst weather.

This paper will focus on how methodology of off grid systems/stand-alone systems can help to reduce the dependency of grid and allow us to live in self-sufficient manners without reliance on one or more public utilities.

CHAPTER ONE

• INTRODUCTION

solar inverter converts direct current (DC) output of a photovoltaic (PV) solar panel into a utility frequency alternating current (AC) that can be fed into a off-grid electrical network. It is a critical balance of system (BOS)–component in a photovoltaic system, allowing the use of ordinary AC-powered equipment. Solar power inverters have special functions adapted for use with photovoltaic arrays, including maximum power point tracking and anti-islanding protection. This work is fully a discussion on an off grid solar PV system which is one of the main types of the solar power system and is also known as a stand-alone power system (SAPS). It works by generating electricity from solar panels and using it to charge a solar battery via a charger controller. That electricity is then converted using an inverter so that it can power the home or business appliances. By saving the electricity in a solar battery, it is possible to run home with solar energy, even at night or during times when there is less sun exposure.

The solar panel used in solar inverter produces direct electricity with the help of electrons that are moving from negative to positive direction. Most of the appliances that we use at home work on alternative current. This AC is created by the constant back and forth of the electrons from negative to positive. In AC electricity the voltage can be adjusted according to the use of the appliance.  As solar panels only produce Direct current the solar inverter is used to convert the DC to AC.

An inverter produces square waves or a sine wave which can be used for running lights, televisions, lights, motors etc. However these inverters also produce harmonic distortion.  Whilst the solar charge controller regulate the amount of voltage the charges the battery from the solar panel.

1.1                                         BACKGROUND OF THE PROJECT

Solar technology isn’t new. Its history spans from the 7th Century B.C. to today. We started out concentrating the sun’s heat with glass and mirrors to light fires. Today, we have everything from solar-powered buildings to solar-powered vehicles. Here you can learn more about the milestones in the historical development of solar technology, century by century, and year by year. You can also glimpse the future. From the 3rd Century BC when Archimedes fought off Roman ships by concentrating the suns rays at them with brass shields (they burst into flame), through work by some of the best known figures in the history of science, harnessing the power of the sun has long been a goal of human innovation. Let’s look at some of the highlights:

In 1767 Swiss physicist, alpine explorer, and aristocrat Horace de Saussure is credited with inventing the first working solar oven, amongst other discoveries. Constructed from 5 layers of glass and measuring around 12 inches across, the oven worked by allowing light to pass through the glass before being absorbed by the black lining and turned into heat. The heat is then reflected by the glass, therefore heating the space inside the box up to 87.5 degrees Celsius.

Also in 1839 Edmond Bequerel, born in Paris in 1820, discovered that when two electrodes were placed in an electrolyte (electricity-conducting solution), a voltage developed when light fell upon the electrolyte. The basic principles of solar power had been uncovered.

Many people using solar power these days which prove that its necessity has been increased in the current years. A Solar inverter is similar to a normal electric inverter but uses the energy of the Sun, that is, Solar energy. A solar inverter helps in converting the direct current into alternate current with the help of solar power. Direct power is that power which runs in one direction inside the circuit and helps in supplying current when there is no electricity. Direct currents are used for small appliance like mobile e phones, MP3 players, IPod etc. where there is power stored in the form of battery. In case of alternative current it is the power that runs back and forth inside the circuit. The alternate power is generally used for house hold appliances. A solar inverter helps devices that run on DC power to run in AC power so that the user makes use of the AC power. If you are thinking why to use solar inverter instead of the normal electric one then it is because the solar one makes use of the solar energy which is available in abundant from the Sun and is clean and pollution free.

Solar inverters are also called as photovoltaic solar inverters. These devices can help you save lot of money.  The small-scale grid  one have just two components i.e. the panels and inverter while  the off grid systems are complicated and consists of batteries which allows users to use appliances during the night when there is no Sunlight available.  The solar panel and the batteries that are placed on rooftops attract Sun rays and then convert the Sunlight into electricity. The batteries too grab the extra electricity so that it can then be used to run appliances at night.

1.2                                                  PROBLEM STATEMENT

As a result of continuous power failure and fluctuation in power supply by Power Holding Company of Nigeria (PHCN), sensitive appliances and system are affected by interruption power supply and also the blackout also affect human generally in that it takes away our happiness. Then, this project is to provide an off grid  back-up and reliable power supply from a renewable energy source (solar panel) to power some selected home appliances such as computers, television set, lighting systems.

1.3                                                   AIM OF THE PROJECT

The aim of the off-grid PV system design is to optimize the most suitable design in order to collect all the available solar energy to satisfy the need for the energy demand at an economically feasible price

1.4                                            OBJECTIVES OF THE PROJECT

At the end of this work, the student involved shall be able to:

1. Understand how off-grid PV system works
2. To build an off-grid 5kva solar inverter

• Understand safety issues that must be understood before you consider installing off-grid PV system components onto your home.

1.5                                           SIGNIFICANCE OF THE STUDY

Currently solar panels are used to provide hot water (solar thermal) and heating to homes and small ensembles. You tried to build solar power plants, using turbines, convert the stored heat into electricity, but these experiments have failed substantially to the low yield of these power relationships with high operating costs and the interruption of electricity supply. The photovoltaic panels are used mainly to power devices away from electrical networks  or with reduced energy requirements so that a connection to the grid would be uneconomical and improper from an organizational perspective. Obviously, these devices must be equipped with batteries that can accumulate the electricity produced in excess during the day to power the equipment at night and during cloudy periods.

With current technology photovoltaic panels are also sensitive to infrared radiation (invisible) of solar radiation and therefore produce power even in case of cloudy weather and rain. The amount of energy delivered is variable and unpredictable, this discontinuity makes it difficult to meet demand at all times current, less than a production with a wide safety margin above the peak annual demand.

1.6                          ADVANTAGES OF OFF-GRID SOLAR SYSTEMS

1. No access to the utility grid: Off-grid solar systems can be cheaper than extending power lines in certain remote areas.
2. Become energy self-sufficient: Another big advantage of going off grid is that, 100% independence from electricity retailers. Need not to pay anything for electricity costs, and 100% insured against rising energy prices. System also protects from grid-tied power failures or blackouts. Living off the grid and being self-sufficient feels good. Energy self-sufficiency is also a form of security. Power failures on the utility grid do not affect off-grid solar systems.

1.7                                               APPLICATIONS OF STUDY

Daylighting
The oldest solar application is day-lighting. Day-lighting system collects and distributes sunlight to provide effective internal illumination inside buildings. Day-lighting design implies careful selection of window types, sizes and orientation may be considered as well. There are also other architectural features such as light shelves and even active sun tracking system which combine with fiber optics or mirrors to provide light to interior of large buildings.

• Solar Thermal

Solar thermal technologies can be used for water heating in homes or commercial and space heating or space cooling for buildings. Solar water heating systems use different type of collectors to gather and store the solar energy for heating water used in residential, commercial and industrial applications. For space heating and cooling in warm temperature region, the thermal mass materials is needed to keep building cool by absorbing solar energy during a day and radiate stored heat to cooler atmosphere at night. However they can be used in cold temperature areas to maintain warmth as well.

• Solar Electric Power Generation

Solar energy can be directly converted to electricity by photovoltaic cells. Solar photovoltaic (PV) systems provide electricity to home or business for lighting, TV, fan, computer, stereo, refrigerator, water pump or livestock feeders, without connection to utility grid. They are also used to power watches, calculators and sign lights.

1.8                                           LIMITATION OF THE PROJECT

The estimated lifetime of the solar panels is about 30 years. The main defects of these systems are the cost of the panels and the storage of energy.

The second obvious problem with this kind of system is that energy is produced only during daylight hours and is not suitable for any situation, being a form of energy electricity hardly accumulate in large quantities.

During the installation, is not always easy to track or position the panel to the right place that will attract sun rays.

1.9                         DISADVANTAGES OF OFF-GRID SOLAR SYSTEMS

Admittedly, while solar power is certainly much cleaner than the burning of fossil fuels, and moderately cleaner than the production of nuclear power, solar panels installation are very pricey and in many years demand for solar panels exceeds supply. When we ask ourselves – why are solar panels necessary, we must consider the costs of production as well as the costs of using much more harmful means of producing electricity. Solar Panels also require more square yardage per kilowatt for the power-generating facility than fossil fuel power plants or nuclear power.

1.10                                              DEFINITION OF TERMS

1. Inverter unit: This unit converts a DC voltage into AC voltage with the help of the inverter
2. Battery Unit: This is a secondary cell unit, capable of storing enough DC voltage from either sun or AC main, of which is later converted to AC voltage.

PROJECT DESCRIPTION

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