Dijlah University College Mechanical Power: Solar Cells and Photovoltaic Array

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What is a common application of stand-alone systems?

Remote mountain cabins and holiday homes (correct)
Grid-connected systems in urban areas
Industrial power plants
High-speed rail networks

What is the primary purpose of a charge controller in a stand-alone PV system?

To reduce the current of the PV array
To disconnect the PV array at night
To protect the batteries and achieve higher availability (correct)
To increase the voltage of the PV array

Why is energy storage necessary in a stand-alone PV system?

Because the PV array produces DC power
Because the energy is generated at the same time it is required
Because the energy generated is not usually required at the same time (correct)
Because the PV array is less efficient at night

What type of batteries are typically used in stand-alone PV systems?

Rechargeable batteries (A) Signup and view all the answers

What is another application of stand-alone systems?

Telephones and communication stations (C) Signup and view all the answers

What is the main component that protects the batteries in a stand-alone PV system?

Charge controller (D) Signup and view all the answers

What happens to the output voltage in a PV system when modules are connected in series?

It increases (B) Signup and view all the answers

In the analogy between a hydraulic system and an electrical system, what is the role of current in the electrical system?

Flow (D) Signup and view all the answers

When PV modules are connected in parallel in a system, what is the main outcome in terms of current?

It increases (B) Signup and view all the answers

What aspect of the electrical system does voltage represent in the hydraulic system analogy?

Pressure (B) Signup and view all the answers

Why does connecting PV modules in series lead to a higher output voltage?

By summing the voltages of each module (C) Signup and view all the answers

What impact does connecting modules in parallel have on the total current in a PV system?

Increases the total current (C) Signup and view all the answers

What is a common component in a grid-connected PV system that is not typically found in a stand-alone system?

Meter cupboard (B) Signup and view all the answers

Which component in a stand-alone PV system regulates the flow of power from the PV modules to the battery?

Charge controller (B) Signup and view all the answers

In a grid-connected PV system, what is the purpose of the PV array combiner/junction box?

Protective equipment (D) Signup and view all the answers

What is the primary function of the battery or battery bank in a stand-alone PV system?

Store energy (A) Signup and view all the answers

Which component of a grid-connected PV system is responsible for converting DC power from the PV array into AC power for use in the home?

Inverter (A) Signup and view all the answers

What is the main purpose of having multiple PV modules connected in series or parallel in both stand-alone and grid-connected PV systems?

Increase power output (D) Signup and view all the answers

What is the primary function of solar cells?

To convert solar energy directly into electricity (C) Signup and view all the answers

What type of materials are commonly used in solar cells?

Semiconductor materials such as silicon, gallium arsenide, and cadmium telluride (A) Signup and view all the answers

What is the energy conversion process in solar cells?

One-step conversion from light energy to electrical energy (D) Signup and view all the answers

What type of electricity do solar cells produce?

Direct current (DC) electricity (C) Signup and view all the answers

What is the purpose of an inverter in a solar panel system?

To convert DC electricity to AC electricity (A) Signup and view all the answers

What is the purpose of batteries in a solar panel system?

To store electrical energy for nighttime and cloudy days (D) Signup and view all the answers

What does FF represent in the context of solar cells?

The fill factor (C) Signup and view all the answers

How is the solar cell temperature (Tc) calculated in the given scenario?

34 + 0.7 x (43-20)/0.8 (A) Signup and view all the answers

What does the manufacturer-rated Pmax of a solar module represent?

The maximum power point under standard conditions (D) Signup and view all the answers

How is the maximum power point (Pmax) calculated in the given scenario?

2.1 x 18.1 x 0.75 (B) Signup and view all the answers

What percentage of the nominal rating will the module operate at if the Pmax is around 62% of the manufacturer's value?

28.5% (D) Signup and view all the answers

In a PV array, why are solar modules electrically connected in series or parallel?

To increase the open-circuit voltage (D) Signup and view all the answers