WAEC 2026 Solar Photovoltaic Installation and Maintenance OBJ & Essay Answers and Questions
Welcome to the most comprehensive guide for candidates preparing for the upcoming examinations. If you are looking for the WAEC 2026 Solar Photovoltaic Installation and Maintenance OBJ & Essay Answers and Questions, you have definitely landed on the right page. Alot of students find this particular trade subject challenging because it combines practical electrical engineering with technical theories, but with the right preparation materials, passing with an A1 is very achievable.
Renewable energy is the future, and West Africa is currently experincing a massive boom in solar energy adoption. Therefore, WAEC has made the Solar Photovoltaic (PV) Installation and Maintanance subject a core part of the technical curriculum. Examiners will test your knowledge on everything from basic electrical principles and safety procedures to complex system sizing and troubleshooting. Make sure you read this entire post carefully because we have compiled likely questions, thier accurate answers, and detailed explanations to help you understand the concepts better.
Why Solar PV Installation is a Top Subject in 2026
Before we jump right into the questions, it’s important to understand why the examiners set the questions the way they do. The world is shifting away from fossil fuels. In Nigeria, Ghana, and other West African countries, solar power has become the most reliable alternative to the national grid. The WAEC syllabus is designed to produce graduates who can immediately enter the workforce as junior installers or advance to higher institutions. This means your exams will be highly practical. You aren’t just memorizing formulas; you are learning how to save lives, protect expensive equipments, and light up homes.
There might be some slight changes in the 2026 curriculum compared to previous years, especially regarding modern lithium-ion batteries and smart hybrid inverters. However, the core principles of direct current (DC), alternating current (AC), and photovoltaic effects remains the same. Let us dive into the objective questions first.
WAEC 2026 Solar Photovoltaic Installation and Maintenance OBJ Questions & Answers
The objective (OBJ) section usually consists of multiple-choice questions. You are expected to choose the correct option from A to D. Below are highly likely questions for the 2026 exams, complete with answers and explanations.
- Question 1: What does the acronym “PV” stand for in a solar energy system?A) Power Voltage
B) Photovoltaic
C) Phase Variance
D) Proton Velocity
Answer: B
Explanation: PV stands for Photovoltaic. “Photo” means light and “voltaic” refers to electricity. It represents the direct conversion of light into electricity at the atomic level.
- Question 2: Which of the following components is primarily responsible for converting Direct Current (DC) to Alternating Current (AC)?A) Charge Controller
B) Solar Panel
C) Inverter
D) Deep Cycle Battery
Answer: C
Explanation: The inverterrs main job is to change the DC generated by the solar panels and stored in batteries into standard AC power used by most household appliances like TVs and refrigerators.
- Question 3: What is the main function of a solar charge controller in a standalone PV system?A) To increase the sunlight hitting the panels
B) To convert AC to DC
C) To prevent the battery from overcharging and deep discharging
D) To store electrical energy for night use
Answer: C
Explanation: The charge controller acts as a voltage and current regulator. It protects the batteries from being overcharged by the panels during the day, and prevents them from being completely drained by the loads at night.
- Question 4: Which of the following is considered a common hazard during solar PV installation?A) Electric shock from high voltage DC lines
B) Excessive ventilation
C) Low battery water levels
D) Too much sunlight on the roof
Answer: A
Explanation: DC voltages from a string of solar panels can be extremely high and lethal. Electric shock and falls from roofs are the top safety hazards for installers.
- Question 5: When measuring the specific gravity of a flooded lead-acid battery, which instrument is used?A) Multimeter
B) Hydrometer
C) Thermometer
D) Barometer
Answer: B
Explanation: A hydrometer measures the specific gravity of the battery’s electrolyte, which indicates the battery’s state of charge.
- Question 6: What is the ideal safety margin percentage usually added when sizing fuses and AC breakers for a solar system?A) 50%
B) 100%
C) 125%
D) 200%
Answer: C
Explanation: The National Electrical Code (NEC) and standard practices require a 125% safety margin for continuous loads to prevent the breakers from tripping unnecessarily and to account for heat.
- Question 7: In a solar PV setup, if you connect four 12V 100Ah batteries in series, what will be the total voltage and capacity?A) 12V, 400Ah
B) 48V, 100Ah
C) 48V, 400Ah
D) 24V, 200Ah
Answer: B
Explanation: When batteries are connected in series, their voltages add up (12 + 12 + 12 + 12 = 48V), but the capacity in Ampere-hours (Ah) remains the same as a single battery.
- Question 8: Which of the following solar panel technologies generally offers the highest efficiency rate?A) Thin-film
B) Polycrystalline
C) Monocrystalline
D) Amorphous silicon
Answer: C
Explanation: Monocrystalline panels are cut from a single, pure crystal of silicon, making them more efficient (and usually more expensive) than polycrystalline or thin-film panels.
- Question 9: Sulphation in a lead-acid battery is mostly caused by what?A) Overcharging
B) Undercharging or leaving the battery discharged for too long
C) Adding too much distilled water
D) Using a high-quality inverter
Answer: B
Explanation: If a battery is left in a discharged state for prolonged periods, lead sulfate crystals harden on the battery plates, a condition known as sulphation, which destroys the battery’s ability to hold a charge.
- Question 10: What is the primary purpose of system earthing (grounding) in a PV installation?A) To boost the output wattage of the solar panels
B) To provide a safe path for fault currents and lightning strikes to dissipate into the earth
C) To connect the system to the national grid
D) To keep the inverter cool
Answer: B
Explanation: Earthing is strictly for safety. It ensures that in the event of a short circuit or a lightning strike, the electrical energy is safely directed into the ground, preventing fires or electrocution.
- Question 11: Which of the following is a mandatory Personal Protective Equipment (PPE) when working on a roof to install solar panels?A) Sunglasses
B) Safety harness with a lanyard
C) Rubber hand gloves only
D) Face mask
Answer: B
Explanation: While gloves and eye protection are important, a safety harness is critical and mandatory to prevent fatal falls when working at heights.
- Question 12: The point on the IV curve where a solar module produces its maximum power is known as?A) Short Circuit Current (Isc)
B) Open Circuit Voltage (Voc)
C) Maximum Power Point (MPP)
D) Duty Cycle
Answer: C
Explanation: The MPP or the “knee” of the curve is where the combined voltage and current are at their highest, yielding the maximum wattage.
WAEC 2026 Solar PV Essay Questions and Answers
The essay part of the WAEC exam tests your deep understanding of the concepts. You will be required to write detailed answers. Do not just list points; try to explain them properly. This is where alot of candidates loose marks because they write too little.
Essay Question 1: Outline and explain the four major components of a stand-alone Solar PV system.
Answer:
A stand-alone solar PV system is an off-grid setup that operates independently of the utility grid. It relies on four primary components to function effectively:
- Solar Panels (PV Array): These are the energy generators of the system. They are made up of photovoltaic cells that capture sunlight and convert it directly into Direct Current (DC) electricity. The amount of electricity generated depends on the size of the panels and the intensity of the sunlight.
- Charge Controller: This device serves as the brain of the battery bank. It regulates the voltage and current coming from the solar panels before it enters the batteries. Its primary job is to prevent the batteries from overcharging during the day and to stop them from deep discharging when the load draws power.
- Battery Bank: Since solar panels only produce electricity when the sun is shining, a storage system is necessary for night time or cloudy days. The battery bank stores the DC energy produced by the panels. Deep cycle lead-acid batteries and Lithium-ion batteries are the most commonly used types in PV systems.
- Inverter: Most home appliances (like fans, TVs, and refrigerators) run on Alternating Current (AC). The inverter is responsible for taking the stored DC electricity from the battery bank and converting it into 220V/240V AC electricity that can be used safely by these standard household appliances.
Essay Question 2: Differentiate between Monocrystalline and Polycrystalline solar panels, stating at least two advantages of each.
Answer:
Monocrystalline and Polycrystalline are both silicon-based solar panels, but they differ primarily in their manufacturing process, appearance, and efficiency.
Monocrystalline Panels: These are manufactured from a single, continuous crystal structure of silicon. They usually have a uniform dark black color and rounded edges on the cells.
Advantages:
1) They boast higher efficiency rates (usually between 15% to 20%), meaning they produce more power per square foot than other types.
2) They perform slightly better in low-light conditions and high-heat environments compared to polycrystalline panels.
Polycrystalline Panels: These are made by melting multiple fragments of raw silicon together to form the wafers. They typically have a blue, speckled appearance and perfectly square cells.
Advantages:
3) The manufacturing process is faster and cheaper, making these panels more affordable for consumers on a budget.
4) There is less silicon waste during the manufacturing process, making them slightly more environmentally friendly to produce.
Essay Question 3: Discuss five safety precautions that must be strictly observed during the installation of a Solar PV system.
Answer:
Working with electricity and heights presents significant risks. The following safety precautions are mandatory:
- Use of Personal Protective Equipment (PPE): Installers must always wear safety boots with rubber soles, insulated hand gloves to prevent electric shock, hard hats to protect from falling objects, and safety goggles.
- Fall Protection: When installing panels on a roof, installers must use a certified safety harness securely anchored to a strong part of the roof structure to prevent fatal falls.
- Safe Handling of Batteries: Batteries contain dangerous chemicals like sulfuric acid and can emit explosive hydrogen gas. Installers must work in well-ventilated areas, keep open flames away, and use insulated tools to prevent short-circuiting the battery terminals.
- Proper System Earthing: It is very important to ensure the entire system (panel frames, inverter chassis) is properly connected to an earth rod. This protects the equipment and users from electrical faults and lightning strikes.
- Disconnect Before Working: Before performing any maintanance or wiring adjustments, all power sources must be isolated. The PV disconnect switch should be turned off, and batteries should be disconnected (always remove the negative terminal first) to ensure the circuit is entirely dead.
Essay Question 4: Explain the step-by-step process of troubleshooting a solar system that is not providing power to the load despite bright sunlight.
Answer:
When a solar system fails to power appliances during sunny conditions, a logical troubleshooting approach is required. The steps include:
First, Check the Inverter. Verify if the inverter is turned on and if it is displaying any error codes. Sometimes, an inverter might trip due to overload. If it has tripped, reset the breaker and reduce the load.
Second, Inspect the Battery Bank Voltage. Use a digital multimeter to check the DC voltage of the batteries. If the voltage is critically low, the inverter will automatically shut down to protect the batteries. This indicates that either the batteries are dead, or they are not receiving charge from the panels.
Third, Examine the Charge Controller. Look at the LED indicators or the screen on the charge controller. It should indicate that power is coming from the PV array. If it shows zero input, the problem is between the panels and the controller.
Finally, Test the Solar Panels and Wiring. If the controller shows no incoming power, go to the roof and check for physical damage, heavy shading, or loose MC4 connectors. Measure the Open Circuit Voltage (Voc) of the panel strings with a multimeter to ensure they are producing electricity. Also, check the inline DC fuses to ensure they haven’t blown.
Tips for Passing Your WAEC Solar PV Exams
Preparation is key. Don’t wait until a week before the exam to start reading. Create a study timetable that allows you to cover both theory and practical aspects. It’s highly reccomended to visit a local solar installation site or workshop if you can. Seeing the components in real life makes it much easier to remember their functions during the exam.
When answering objective questions, read the options carefully. Sometimes two options look very similar, but one contains a specific technical term that makes it the correct choice. For your essays, always try to use diagrams if you are asked to explain a circuit connection. Even if your English is not perfect, a well-labeled diagram can earn you full marks.
Don’t forget to double check your wireings mentally when writing out your answers. A simple mistake like writing “connect batteries in parallel to increase voltage” instead of “series” can cost you heavily. Always cross-check your work.
Official WAEC Portal Sign Up and Registration
For all official candidate registrations, checking of centers, and verifying your exam status, you must use the official portal provided by the examination board. Ensure you fill out your details correctly to avoid administrative issues later. To register, get started, or access your digital certificate, please visit the official website here: WAEC Official Portal Registration.
