Solar Energy System Design & Installation Flashcards

What is the main purpose of a solar inverter?

Answer: To convert DC electricity to AC electricity.

Solar panels generate Direct Current (DC) electricity, but most homes and the electrical grid operate on Alternating Current (AC) electricity. The main purpose of a solar inverter is to convert this DC power into usable AC power. This conversion is crucial for powering household appliances and feeding excess electricity back into the utility grid.

How does shading affect solar panel performance?

Answer: Shading reduces energy production dramatically.

Shading significantly impacts solar panel performance because even partial shading on a single cell can dramatically reduce the output of an entire panel or string of panels. This is due to the series connection of cells; if one cell is shaded, it acts as a bottleneck, limiting the current flow for all other cells. Consequently, energy production can drop sharply, making shade avoidance critical for optimal system efficiency.

What is the primary advantage of a grid-tied solar system?

Answer: It can sell excess energy back to the grid.

A grid-tied solar system is connected to the local utility grid, allowing for a seamless exchange of electricity. Its primary advantage is the ability to sell any excess energy generated by the solar panels back to the grid. This process, often managed through net metering, provides financial credits or payments to the homeowner, effectively reducing or even eliminating their electricity bill without needing expensive battery storage.

What is the typical lifespan of a solar panel?

Answer: 25-30 years.

Modern solar panels are designed for durability and longevity, typically having a lifespan of 25-30 years. Manufacturers often provide performance warranties guaranteeing a certain percentage of the original power output for this duration. While panels may continue to produce electricity beyond this period, their efficiency will gradually decline over time.

What is the function of a charge controller in a solar energy system?

Answer: To prevent overcharging of the battery bank.

In solar energy systems that utilize batteries, a charge controller is a vital component. Its function is to regulate the voltage and current flowing from the solar panels to the battery bank. This prevents overcharging, which can severely damage batteries and shorten their lifespan, ensuring the battery bank remains healthy and operates efficiently.

How can solar panels be mounted on a roof?

Answer: Using roof-mounted racks.

Solar panels are typically mounted on a roof using specialized roof-mounted racks. These racking systems securely attach the panels to the building's structure, ensuring they are properly angled and oriented for maximum sun exposure. This method also allows for adequate airflow around the panels, which helps maintain their efficiency.

What is net metering in a solar power system?

Answer: It allows excess energy to be sold to the grid for credit.

Net metering is a billing mechanism that credits solar energy system owners for the electricity they contribute to the grid. When a solar system generates more power than the home consumes, the excess is sent back to the utility grid. The homeowner then receives a credit on their electricity bill, effectively 'netting' their energy consumption against their production.

What is the most efficient orientation for solar panels?

Answer: South-facing.

In the Northern Hemisphere, the most efficient orientation for solar panels is typically south-facing. This direction allows the panels to receive the most direct sunlight throughout the day and across all seasons. Maximizing direct sun exposure ensures the highest possible energy production from the solar array.