Solar PV systems, Principles for SS 1

Class: SS 1
Term: First Term
Week: 7
Age: 15 years
Duration: 60 minutes
Subject: Solar PV Installation and Maintenance
Curriculum Theme: Principles of solar photovoltaic (PV)
Focal competence: Demonstrate the knowledge of Solar PV System as a viable source of renewable energy for environmental sustainability
Key competencies/values: Communication; Collaboration
Skills:

• define solar PV systems
• explain the principles of solar PV systems

Previous Lesson: Renewable energy and climate change
Topic: Solar PV System
Subject Matter: Meaning and principles of solar PV systems

Specific Objectives

By the end of the lesson, pupils/students should be able to:

Cognitive Domain

• define solar PV systems;
• explain the principles of solar PV systems.

Affective Domain

• appreciate solar PV systems as a source of renewable energy;
• participate actively in discussions about solar PV technology.

Psychomotor Domain

• identify basic components of a solar PV system from pictures or actual items;
• sketch a simple diagram illustrating the flow of energy in a solar PV system.

Reference Materials

The following resources were used in planning this lesson:

• 2025 New Revised Senior Secondary Education Curriculum (SSEC)
• Relevant State Unified Scheme of Work
• The HeadTeacher Scheme of work For The New Revised Senior Secondary Education Curriculum (SSEC)
• Basic Solar PV Installation and Maintenance Textbook for SS 1

Instructional Materials

The teacher will teach this lesson with the aid of:

• Charts showing solar PV system diagrams
• Pictures of solar panels, inverters, batteries, and charge controllers
• Actual inverter
• Actual solar battery
• Actual charge controller
• Whiteboard and markers

Rationale for the Lesson

This lesson is important as it lays the foundational understanding of solar PV technology, which is crucial for sustainable energy solutions in Nigeria. It helps students grasp how sunlight can be converted into usable electricity, fostering an appreciation for renewable energy and its practical applications. This knowledge supports future learning in solar PV installation and maintenance.

Prerequisite/Previous Knowledge

Students should have a basic understanding of electricity, energy, and the concept of renewable energy sources.

Lesson Content/Board Summary

Solar PV System

Meaning of Solar PV Systems

A Solar Photovoltaic (PV) system is an electrical system that converts sunlight directly into electrical energy using a process called the photovoltaic effect. It is a clean and renewable energy source, making it an important technology for environmental sustainability.

Principles of Solar PV Systems

The operation of a solar PV system is based on the photovoltaic effect, which involves the following principles:

1. Light Absorption: Solar panels, made up of photovoltaic cells, absorb photons (particles of light) from sunlight.
2. Electron Excitation: When photons strike the semiconductor material (usually silicon) in the solar cells, they transfer their energy to electrons within the material. This energy causes the electrons to become excited and break free from their atoms.
3. Electric Field Creation: The solar cell is designed with an internal electric field that pushes these freed electrons in a specific direction, creating an electric current.
4. Current Flow: This flow of electrons constitutes direct current (DC) electricity. The more intense the sunlight, the more photons are absorbed, leading to a greater flow of electrons and thus more electricity generated.
5. Conversion and Storage: The DC electricity generated by the solar panels is then managed by a charge controller, stored in batteries for later use, or converted into alternating current (AC) by an inverter to power standard household appliances or feed into the electrical grid.

Basic Components of a Solar PV System

A typical solar PV system consists of several interconnected components that work together to generate and deliver electricity. These include:

1. Solar Panels (PV Modules): These are the primary components that capture sunlight and convert it into DC electricity. They are made of multiple photovoltaic cells.
2. Charge Controller: This device regulates the voltage and current coming from the solar panels to the batteries, preventing overcharging and deep discharging, which can damage the batteries.
3. Batteries: Used to store excess electrical energy generated by the solar panels. This stored energy can then be used during periods of low sunlight (e.g., at night or on cloudy days) or when the demand for electricity is high.
4. Inverter: Converts the direct current (DC) electricity produced by the solar panels and stored in batteries into alternating current (AC) electricity. Most household appliances and the national grid operate on AC power.
5. Mounting Structure: A frame or rack used to securely hold the solar panels in place, typically on a roof or on the ground, at an optimal angle to capture maximum sunlight.
6. Wiring and Cables: Electrical conductors that connect all the components of the solar PV system, ensuring the safe and efficient flow of electricity.
7. Loads: These are the electrical appliances, lights, or devices that consume the electricity supplied by the solar PV system.

Teaching Methods/Instructional Techniques

Discussion, Demonstration, Guided Practice, Question and Answer, Explanation, Group Work, Practical Activity

Instructional Procedures

Step 1: Introduction

Time: 5 minutes

Teaching Skill: Questioning/Engaging

Teacher’s Activity: The teacher greets the students and asks them to recall different sources of energy they know, especially renewable ones. The teacher then introduces solar energy as a key renewable source.

Pupils’ Activity: Pupils respond by mentioning various energy sources like petrol, diesel, hydro, wind, and solar. They listen attentively.

Learning Point: Renewable energy sources

Step 2: Meaning of Solar PV Systems

Time: 10 minutes

Teaching Skill: Explanation/Discussion

Teacher’s Activity: The teacher guides students to participate in a class discussion on the meaning of solar PV systems, using charts and pictures to illustrate. The teacher provides a clear definition.

Pupils’ Activity: Pupils contribute to the discussion, observe the charts and pictures, and attempt to define solar PV systems in their own words.

Learning Point: Definition of solar PV

Step 3: Introduction to Principles

Time: 10 minutes

Teaching Skill: Explanation/Demonstration

Teacher’s Activity: The teacher explains the basic principle of how solar panels convert sunlight into electricity (photovoltaic effect), using simple analogies and diagrams on the board.

Pupils’ Activity: Pupils listen, ask questions for clarification, and observe the diagrams.

Learning Point: Photovoltaic effect explained

Step 4: Detailed Principles of Solar PV Systems

Time: 10 minutes

Teaching Skill: Explanation/Illustration

Teacher’s Activity: The teacher elaborates on the principles, explaining light absorption, electron excitation, electric field creation, and current flow in solar cells, as outlined in the board summary.

Pupils’ Activity: Pupils pay close attention, take mental notes, and try to grasp the scientific principles.

Learning Point: Solar PV principles

Step 5: Identifying Basic Components

Time: 10 minutes

Teaching Skill: Demonstration/Identification

Teacher’s Activity: The teacher displays actual components (inverter, solar battery, charge controller) and pictures of solar panels, guiding students to identify and name each component. The teacher explains their individual functions.

Pupils’ Activity: Pupils observe the components, identify them, and listen to the explanations of their functions.

Learning Point: Solar PV components

Step 6: System Operation and Energy Flow

Time: 5 minutes

Teaching Skill: Explanation/Diagrammatic representation

Teacher’s Activity: The teacher uses a chart or draws a simple diagram on the board to illustrate how the identified components work together to form a complete solar PV system and the flow of electrical energy.

Pupils’ Activity: Pupils observe the diagram, trace the energy flow, and ask questions about the interconnection.

Learning Point: Energy flow in PV

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

1. What is a solar PV system?
2. Briefly explain the photovoltaic principle.
3. Mention two basic components of a solar PV system.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Understanding PV systems

Step 8: Note-Taking

Time: 10 minutes

Teaching Skill: Guided Writing

Teacher’s Activity: The teacher guides pupils/students to copy the essential Board Summary notes on the meaning, principles, and components of solar PV systems into their notebooks.

Pupils’ Activity: Pupils/students copy the notes carefully into their notebooks.

Learning Point: Recording lesson notes

Step 9: Conclusion

Time: 5 minutes

Teaching Skill: Summarizing/Reinforcement

Teacher’s Activity: The teacher briefly summarizes the key points of the lesson, emphasizing the importance of solar PV systems as a clean energy source and encourages students to observe solar installations around them.

Pupils’ Activity: Pupils listen to the summary and reflect on the lesson.

Learning Point: Solar PV importance

Continuous Assessment/Further Study

Type: Homework

Instruction: Answer the following questions in your notebook:

1. Define a solar PV system in your own words.
2. Describe the main principle by which solar panels generate electricity.
3. List and briefly explain the function of any three components of a solar PV system.
4. Draw a simple diagram showing the basic layout of an off-grid solar PV system.

Lesson Keywords

• Solar PV System – A system that converts sunlight into electrical energy.
• Photovoltaic Effect – The process by which light energy is converted into electrical energy in a semiconductor material.
• Solar Panel – A device that absorbs sunlight and converts it into electricity.
• Inverter – A device that converts DC electricity to AC electricity.
• Charge Controller – A device that regulates battery charging from solar panels.
• Battery – A device used to store electrical energy.

Differentiation

Support: For students who struggle, provide simplified diagrams and allow them to work in pairs to identify components and explain principles. Use more visual aids and repeat key definitions.
Extension: Challenge advanced students to research different types of solar PV systems (e.g., grid-tied, off-grid, hybrid) and present their findings to the class, or explore the environmental benefits of solar energy in more detail.

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