Mock Installation Project II SS3 Solar Photovoltaic Installation & Maintenance Lesson Note

Class: SS3

Subject: Solar Photovoltaic Installation and Maintenance

Topic: The Physical Installation and Final “Switch-On” (Commissioning)

Moving from Paper to Power

In our last lesson, we finished the design and sizing. Today is the day we bring those plans to life. In the solar industry, a beautiful design is useless if the installation is messy or dangerous.

The Professional Mindset: A solar technician is part-electrician, part-carpenter, and part-scientist. Today, your group must focus on Precision. If a screw is halfway in, or a wire is stripped too long, the system might fail next week.

Safety First:

• No Wet Hands: Even a small 12V battery can give a nasty spark if your hands are sweaty or wet.
• Eyes Up: Always be aware of where your teammates are moving, especially when carrying heavy batteries or glass panels.

Mounting the “Engine” (Inverter and Controller)

We don’t just throw the inverter on the floor. It needs a proper “home.”

Practical Steps:

1. Wall Mounting: Choose a wall that is cool and dry. Inverters get hot when they work, so they need “breathing space” (ventilation) around them.
2. The “Eye Level” Rule: Install the Charge Controller at eye level. Why? Because you need to be able to read the screen easily to check if the system is charging.
3. Firm Grip: Use the correct wall plugs and screws. These components are heavy; you don’t want them falling off the wall in the middle of the night!

The Wiring Sequence (The “Magic” Order)

This is the most important page in your note. If you get this order wrong, you can “fry” (burn) your expensive charge controller.

The Golden Sequence:

• Step 1: Battery to Controller. This wakes up the controller and tells it whether the system is 12V or 24V.
• Step 2: Panels to Controller. Only after the controller is “awake” should you introduce the power from the sun.
• Step 3: Inverter to Battery. Connect the inverter directly to the battery terminals, not to the controller. The inverter “drinks” too much power for the controller to handle.
• Step 4: Load to Inverter. Finally, plug in your bulbs or fans.

Commissioning (The “Live” Test)

“Commissioning” is just a fancy word for Testing. You don’t just turn it on and walk away; you must prove that it works safely.

The Commissioning Checklist:

1. The “Sniff” Test: Turn the system on. Do you smell anything burning? Do you hear any strange “popping” sounds? If yes, switch it off immediately!
2. Voltage Verification: Use your Multimeter. If your battery bank is 24V, the meter should read somewhere between 24V and 28V depending on the sun.
3. Polarity Check: Ensure Plus (+) went to Plus and Minus (-) went to Minus. Getting this wrong is the #1 cause of blown fuses in Nigeria.

Handover and Documentation

A professional doesn’t just leave the house once the lights are on. You must teach the “Customer” (in this case, your teacher) how to use the system.

The Handover Talk:

• Explain the Lights: “When this light is Green, you are fine. When it turns Red, stop using the freezer.”
• Maintenance Tips: Show them how to use a soft cloth to wipe dust off the panels.
• The Logbook: Write down the final battery voltage and the time the system was finished. This is your “Birth Certificate” for the installation.

Group Reflection: After the mock installation, sit with your team. What was the hardest part? Did the project manager lead well? This is how you improve for your real SSCE practical.