FREE SE Engr. Photovoltaic (PV) System Design Questions and Answers

Question 1

What is the primary function of a photovoltaic (PV) inverter?

Accepted Answer

Convert DC to AC

Answer

Solar panels generate direct current (DC) electricity, but most household appliances and the electrical grid operate on alternating current (AC). A PV inverter is a critical component that converts the DC power produced by the solar panels into usable AC power. This conversion is essential for integrating solar energy into homes and the existing electrical infrastructure.

Question 2

Which factor most significantly affects the efficiency of a PV panel?

Accepted Answer

The angle and exposure to sunlight

Answer

The efficiency of a PV panel is highly dependent on the amount of direct sunlight it receives. Optimizing the panel's tilt angle and orientation ensures maximum exposure to the sun's rays throughout the day and year. Any shading or suboptimal angling can drastically reduce the amount of solar energy converted into electricity, thus impacting overall efficiency.

Question 3

What is the main purpose of a maximum power point tracker (MPPT) in a PV system?

Accepted Answer

Improve efficiency by optimizing power output

Answer

Solar panels have a unique maximum power point (MPP) at which they produce the most power under specific conditions. An MPPT charge controller continuously tracks and adjusts the electrical operating point of the PV array to ensure it always operates at or near its MPP. This optimization maximizes the energy harvest from the solar panels, significantly improving the overall efficiency of the system, especially under varying weather conditions.

Question 4

What is the standard test condition (STC) for measuring PV module performance?

Accepted Answer

1000 W/m² irradiance at 25°C

Answer

Standard Test Conditions (STC) are a set of laboratory conditions used to uniformly rate and compare the performance of different PV modules. These conditions specify an irradiance of 1000 W/m² (which simulates peak midday sun), a cell temperature of 25°C, and an air mass of 1.5. Using STC allows for a standardized and fair comparison of power output and efficiency among various solar panels.

Question 5

What is the primary function of a charge controller in a PV system?

Accepted Answer

Regulate battery charging and prevent overcharging

Answer

In PV systems with battery storage, a charge controller is essential for managing the flow of electricity from the solar panels to the batteries. Its primary function is to regulate the voltage and current, preventing the batteries from being overcharged, which can damage them and shorten their lifespan. It also protects against deep discharge, ensuring the longevity and safe operation of the battery bank.

SE Engr. - Solar Energy Engineering Certification Practice Test

SE Engr. - Solar Energy Engineering Certification Practice Test

FREE SE Engr. Photovoltaic (PV) System Design Questions and Answers