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

Class: SS3

Subject: Solar Photovoltaic Installation and Maintenance

Topic: Keeping the System Alive (Finding Faults and Preventing Breakdowns)

Why Systems Fail

Congratulations! Your mock system is installed and working. But in the real world, a solar system is like a car—it needs regular “check-ups” to keep running.

Most solar problems in Nigeria aren’t caused by “bad luck.” They are usually caused by:

• Heat: Components getting too hot because of poor ventilation.
• Dust: Harmattan dust covering panels and blocking the sun.
• Loose Wires: Vibrations or heat causing screws to loosen over time.

The Golden Rule: It is much cheaper to maintain a battery than to replace it. Maintenance is the secret to making a system last 10 years instead of 2 years.

The Technician’s Senses (Look, Listen, Smell)

Before you even bring out your Multimeter, you can find 50% of problems just by using your human senses.

1. Look: Are the battery terminals “crusty” or white? (This is corrosion). Is the inverter screen flashing an Error Code?
2. Listen: Is the inverter fan making a loud, grinding noise? This means the fan is failing and the system will soon overheat.
3. Smell: Do you smell “rotten eggs”? This is a serious sign that a Lead-Acid battery is overcharging and releasing dangerous gas. Do you smell burning plastic? Check your wire connections immediately!

Troubleshooting with the Multimeter

When your senses aren’t enough, we use the Multimeter. It is the “Stethoscope” of the solar doctor.

Common Scenarios:

• Scenario A: No Power from Panels. * The Test: Set the meter to DC Voltage. Measure at the ends of the wires coming from the roof.
  1. The Result: If you get 0V in bright sun, there is a break in the wire or a blown fuse.
• Scenario B: Inverter keeps shutting down.
  1. The Test: Measure the battery voltage while the inverter is trying to run a load (like a fan).
  2. The Result: If the voltage “drops like a stone” (e.g., from 12.6V to 10.2V instantly), the battery is weak and cannot hold a load anymore.

Preventive Maintenance (PM) Schedule

To be a professional, you should give your customer a “Service Calendar.”

Solving the “IoT Connection” Issues

Since we are using Smart Monitoring, we have a new type of troubleshooting: Digital Faults.

If your monitoring app says the system is “Offline,” don’t panic! It doesn’t mean the power is out.

1. Check the Wi-Fi: Has the router run out of data? Has the signal been blocked by a new wall or metal door?
2. Restart the Dongle: Sometimes the small Wi-Fi stick on the inverter just needs to be unplugged and plugged back in (Restarting).
3. Firmware Updates: Sometimes the app needs an update to talk to the hardware correctly.

Final Project Task: In your groups, one student should “create” a small fault (like disconnecting a fuse or shading a panel). The other students must use their tools to find the fault and explain how to fix it. This is how you prove you are ready for the SSCE Practical!