REP - Certified Renewable Energy Professional Solar Energy Systems Questions and Answers

Question 1

A project manager is overseeing the installation of a rooftop photovoltaic (PV) system in the Northern Hemisphere. To maximize the total annual energy output, what is the generally recommended orientation for the fixed-tilt solar panels?

Accepted Answer

True south to maximize daily sun exposure

Answer

In the Northern Hemisphere, the sun travels across the southern part of the sky. Orienting solar panels to face true south ensures they receive the most direct sunlight exposure throughout the day and across all seasons, which maximizes the total annual energy production.

Question 2

What is the primary function of an inverter within a grid-tied solar energy system?

Accepted Answer

To convert direct current (DC) electricity from the PV modules into alternating current (AC) electricity

Answer

Photovoltaic panels generate DC electricity. The electrical grid and standard building appliances operate on AC electricity. The inverter's essential role is to convert the DC output from the solar array into grid-compatible AC power.

Question 3

Which of the following is a primary advantage of using module-level power electronics (MLPE), such as microinverters or DC optimizers, compared to a traditional string inverter configuration?

Accepted Answer

Improved energy harvest in partially shaded conditions

Answer

In a string inverter system, the output of the entire series of panels is limited by the performance of the weakest panel (e.g., one that is shaded). MLPEs manage the output of each individual panel, so the negative impact of a single shaded or soiled panel does not degrade the performance of the entire array, leading to a better overall energy harvest.

Question 4

An off-grid solar installation for a remote cabin must provide power overnight and during cloudy days. Which component is essential for this system but is not a standard requirement for a basic grid-tied system?

Accepted Answer

A battery bank for energy storage

Answer

Off-grid systems are autonomous and require a battery bank to store the energy generated by the solar panels. This stored energy is then used to power loads when the panels are not producing electricity, such as at night or during inclement weather. Grid-tied systems use the utility grid for backup power, making on-site storage optional.

Question 5

When designing a solar PV system, the term 'solar insolation' is a critical factor in performance estimates. What does this term measure?

Accepted Answer

The amount of solar radiation energy received per unit of area over a given time

Answer

Solar insolation is the measure of solar energy that reaches a specific surface area over a set period. It is a fundamental metric used to calculate the potential energy generation of a PV system in a particular location and is often expressed in units like kilowatt-hours per square meter per day (kWh/m²/day).

(REP) Certified Renewable Energy Professional Practice Test

(REP) Certified Renewable Energy Professional Practice Test

REP - Certified Renewable Energy Professional Solar Energy Systems Questions and Answers