Part 3: Solar Efficiency Lab Proposal and Design

Design a PV Efficiency Investigation Lab
Design a controlled experiment to test how one environmental factor affects photovoltaic (PV) performance. Your goal is to use your results to improve the design, size, or placement of your school’s solar array. Your lab proposal must be approved by your teacher before testing begins. 

Available Materials and Lab Setup
Your experiment must be designed using the materials provided by your teacher. You may request additional materials based on your chosen variable and experimental design. 

Basic materials available to all groups:

• Mini PV cell
• Multimeter
• Electrical tape
• Protractor
• Ruler or tape measure
• Stopwatch or timer
• Light source ( incandescent bulb or lamp)
• Graph paper or digital graphing tool
• Extension cord and wire stripper (if needed)

Work Format
Complete all parts of this section in your science notebook or a digital document. 

• Label each section clearly (e.g., Research Question, Background, Variables, etc.)
• Keep your work organized, neat, and in order.
• Your responses should be complete, clear, and ready for review.

Measurement Options
When designing your experiment, consider how you will measure PV performance and what tools you will use. Watch carefully as your teacher demonstrates different circuit setups and measurement tools. 

• Simple Setup: You may measure voltage only using a multimeter.
• Advanced Setup: You may measure both voltage and current and calculate power using the formula: Power (W) = Voltage (V) x Current (A)

Choose a method that fits your experimental design and available materials.

Lab Proposal and Design Required Elements

1. Research Question
   Write a clear, testable question. 
   • Focus on one independent variable (e.g., tilt angle; shading; temperature; light intensity).
   • Identify one measurable outcome (e.g., voltage, current, or power).
   • Ensure your question is testable with available materials and time.
     
2. Design Purpose
   • Explain how your experiment will help improve your school’s solar array design.
   • Describe how your investigation will be unique compared to other groups (different variables, method, or setup).
     
3. Background and Context
   Explain the science behind your investigation.
   • Describe how PV cells generate electricity.
   • Explain how your chosen variable affects PV performance.
   • Use provided resources or reputable online sources to support your explanations.
   • Identify what you will measure and the equipment you will use.
     
4. Variables
   Identify all variables in your experiment.
   • Independent variable: What you will change. Include at least 3 different values or conditions. For example, different angles, distances, or levels of shading. 
   • Dependent variable: What you will measure.
   • Baseline condition (control): Your standard setup used for comparison (the condition you will compare all other trials to) 
   • Controlled variables: At least 3 factors you will keep constant.
     
5. Real-World Constraints and Design Purpose
   Engineers design within limits. Your experiment should reflect real-world trade-offs.
   • Identify and describe two real-world constraints (e.g., time, materials, cost, safety).
   • Explain how these constraints may limit or impact your experiment.

6. Hypothesis and Prediction
   • Write an [If . . . then] hypothesis statement that predicts the relationship between variables.
   • Create a sketch of your expected data trend, showing what you think your data will look like in a graphical sketch. 
     
7. Materials
   List all materials needed for your experiment. 
   • Your list should be detailed enough that another group could gather the same materials and repeat your experiment.
   • Clearly identify any additional materials your group will need beyond those provided to all groups by the teacher.
     
8. Procedure (Research Method)
   Write a clear, step-by-step procedure for your experiment.
   • Use numbered steps.
   • Test at least 3 values or conditions of your independent variable.
   • Include at least 3 trials per value or condition.
   • Describe how data will be collected and recorded. Create the table(s) needed to record all data.
     
9. Teacher Approval
   Submit your completed proposal for approval. Revisions may be required for safety, clarity, or feasibility.