Why Is My Solar System Producing Less Power Than Expected?

Wondering why your solar system isn't generating as much energy as you thought it would?
It’s a common question, and the good news is—it doesn’t always mean something’s wrong. Several factors can influence solar performance, from weather conditions to system setup. Let’s walk through what might be going on and how to check for common issues.

1. Sunlight Availability (Weather & Location)
Solar panels generate power from sunlight, not heat. If it's cloudy, raining, or wintertime, your system’s output will naturally dip.

• Cloud cover reduces the amount of sunlight reaching your panels.

• Shorter winter days mean fewer daylight hours to generate energy.

• Shading from trees, chimneys, or nearby buildings can reduce output—even if it only covers part of one panel.

Tip: Use your solar monitoring app to compare daily sunlight levels with production. If they line up, your system is likely working as it should.

2. System Losses & Efficiency Factors
Some energy loss is completely normal in any solar setup. Here’s why:

• Inverter efficiency: Most operate at 95–98%.

• DC to AC conversion: This process always results in some loss.

• Wiring losses: Long or improperly sized cables can reduce performance.

• Dust or debris on panels can block sunlight and lower efficiency—sometimes by 5–20%.

Tip: Take a look at your panels. If they’re dusty or shaded, a quick cleaning may help boost output.

3. Installation-Related Issues
If your system is new or has recently been relocated, consider the following:

• Panel orientation: In Canada, panels should ideally face south for optimal sun exposure.

• Tilt angle: Panels not angled correctly may miss the best light.

• Ventilation: Panels need airflow underneath to stay cool and efficient.

• Loose connections can reduce performance or cause outages.

Tip: Check your installation photos or ask your installer to confirm everything is positioned correctly.

4. Inverter or Component Malfunction
The inverter is the system’s brain. If it’s not working properly, your whole setup can be affected.

• Look for error codes or warning lights.

• Listen for unusual sounds like buzzing or clicking.

• Check if the system appears offline in your monitoring app.

Tip: Try restarting your inverter as per the manual. If the issue continues, it’s time to contact support.

5. Expectations vs. Real-World Performance
Sometimes your system is working just fine—but expectations were set too high.

• Estimates vs. actual production: System quotes are often based on ideal conditions (lab-based Standard Test Conditions).

• Increased energy use: More appliances running? That can make it seem like the system is underperforming.

Tip: Review your monitoring portal over several weeks to spot trends, not just one-off drops.

📋 Quick Troubleshooting Checklist

💡 Still have questions? Call us at 1-888-421-5354 or email hello@solarpowerstore.ca. To submit a support request, please use the form located below this article. If you'd like to speak with our team directly, you can also book a meeting here.