Learner Lesson 6: How Do We Build and Use Photovoltaic Panels?
Lesson Overview
In the last lesson, you explored how a single solar cell turns light into electrical energy. You measured voltage, current, and power and saw that the output changed when the light changed. In this lesson, you will scale up from one solar cell to a full photovoltaic panel.
A photovoltaic panel is made from many solar cells working together. Engineers do not choose panels based only on the biggest watt number printed on the label. They also think about how the cells are arranged, how the panel performs in hot conditions, how much roof space is available, and how well the panel fits the needs of the system.
By the end of this lesson, you will understand how solar panels are built, how series and parallel connections affect electrical output, and how engineers use panel specifications to make design choices.
Questions You Will Be Able to Answer by the End of This Lesson
- How do many photovoltaic cells work together in a panel?
- How do series and parallel connections change voltage, current, and power?
- How do engineers choose between different solar panels for a real system?
Key Vocabulary and Concepts
|
Term |
Definition |
|---|---|
|
Photovoltaic panel or module |
A group of photovoltaic cells wired together and packaged for outdoor use. |
|
Series connection |
A connection in which voltages add while current stays about the same. |
|
Parallel connection |
A connection in which currents add while voltage stays about the same. |
|
Rated power |
The amount of power a panel can produce under standard test conditions (STC). |
|
Voltage at maximum power |
The voltage at which the panel produces its rated power. |
|
Current at maximum power |
The current at which the panel produces its rated power. |
|
Module efficiency |
The percentage of sunlight the panel converts into electrical power per unit area. |
|
Temperature coefficient |
The rate at which panel power changes as temperature rises or falls. |
|
Trade-off |
A choice where one benefit is gained while another is limited or reduced. |