cameroon gce intermediate level 2025 photovoltaic systems 2
cameroon gce intermediate level 2025 photovoltaic systems 2
Based on the image you provided, here are the questions exactly as they appear:
2.6.2. Label the parts ‘a’ to ‘e’. (5 marks)
2.7. Figure 2 shows 4 solar cells connected in series/parallel. The voltage at maximum power for each cell is 0.485V and the current at maximum power for each cell is 32mA.
2.7.1. Label the parts ‘a’ and ‘b’ in figure 2 and state their functions. (4 marks)
2.7.2. State the effect of the leaf on cell#3 as indicated and hence, determine the output current of cell#3 and cell#4 if the output current of cell#1 has dropped to 5mA. (4 marks)
Based on the image provided, here are the questions exactly as they appear:
- Batteries are other components used in a photovoltaic system.
- 3.1. Differentiate between a primary battery and a secondary battery
- 3.2. Name two examples of primary and secondary battery each.
- 3.3. Give two differences between a deep cycle battery and a shallow cycle battery.
- 3.4. Name four problems that can cause a battery to fail.
- 3.5. After sizing the battery for the multimedia centre of your school, the size of the battery needed was estimated to be about 2700Ah, with a system voltage of 24V, but the batteries available for the battery bank are rated 300A, 12V.
- 3.5.1. Calculate the total number of batteries needed for the installation.
- 3.5.2. Draw the wiring diagram of the battery bank.
- 3.6. A 3.7V battery delivers a charge of 100m Ah. Calculate the energy delivered in joules
- Charge controller and inverter are some other components used in the photovoltaic system
- 4.1. State three effects of using a photovoltaic system without a charge controller.
- 4.2. The characteristics of some charge controllers in the market are given in table 2 below
- 4.2.1. What is the nature of the input voltage of a charge controller? Explain your answer.
- 4.2.2. Let panels of rating: maximum power = 150W; voltage at maximum power = 16.93V; current at maximum power = 8.86A. If the array has three series paths and six parallel paths, select the most appropriate charge controller needed.
- 4.3. Write the other in which components of the PV system should be disconnected from the charge controller.
- 4.4. Give three differences between a pure sine wave and a modified sine wave inverter.
- 4.5. State four criteria to be considered when choosing an inverter
- 4.6. An installation has a washing machine with power rating 2.4kW and a power factor of 0.75. Calculate the rating of the inverter needed in VA for the washing machine with a security margin of 30%.
- After designing a PV system, the next thing to be done is to buy the materials and install.
- 5.1. Sketch the block diagram of a hybrid PV system.
- 5.2. Give four conditions necessary when combining solar modules in series/parallel.
- 5.3. Give three safety rules to be observed when handling batteries.
- 5.4. Consider the architectural diagram of Figure 3.
- 5.4.1. Identify the type of wiring circuit used in the corridor.
- 5.4.2. Draw the developed diagram of the wiring circuit of the corridor
