7 Common Causes of Solar Underperformance

Your solar system should consistently reduce your utility bills and provide strong energy output. If it’s not, something may be wrong. Here are seven common reasons for underperformance and why they matter for New Jersey homeowners.

1. Shading From Trees or Buildings

New Jersey’s leafy neighborhoods make shading a frequent issue. Even partial shading can cause entire strings of panels to produce less energy. Regular tree trimming and shading analysis help keep systems efficient.

2. Dirt and Debris Buildup

Pollen, leaves, and bird droppings can lower production by as much as 20%. Seasonal cleanings keep your panels working at peak efficiency.

3. Inverter Issues

The inverter is the most common failure point in any system. Small glitches can cut output in half. Routine monitoring helps catch these problems before they impact your bills.

4. Poor System Design

If your system was poorly designed — panels facing the wrong direction, incorrect system size — you’ll never see the returns you were promised. Choosing an experienced installer prevents these costly mistakes.

5. Aging Equipment

Panels degrade over time. While most only lose 0.5–1% efficiency per year, after 20 years the impact adds up. Regular inspections identify when upgrades may be needed.

6. Wiring or Connection Faults

Loose or damaged wiring can reduce efficiency and create fire hazards. Licensed contractors check and tighten connections during maintenance.

7. Monitoring Neglect

Without proper monitoring, you won’t notice when output dips. A good monitoring system pays for itself by alerting you to problems early.

Conclusion

If your system isn’t performing the way it should, SLM Solar can help. Our technicians specialize in diagnosing and correcting performance issues to restore your savings.

Call us at 765-276-6952 

or visit www.slmsolarnj.com to schedule a system checkup.