Top 5 Common Solar Panel Problems (and How to Spot Them) – Solarsmith® Guide

Your solar panels work hard every day, quietly converting sunlight into clean energy. But like any technology, they can develop faults over time. Recognising issues early can prevent costly breakdowns and keep your system running efficiently.

Here are the five most common problems we see in Surrey, Sussex, and South London – and how to spot them.

1. Inverter Failures

The inverter is the heart of your solar system, converting DC electricity into AC power for your home. Most last 10–15 years before replacement is needed.

Warning signs include:

• Error lights or fault codes

• Blank or flashing display screen

• Buzzing noises or overheating

If your generation meter shows no output, it could be an inverter issue. (Energy Saving Trust)

2. Wiring and Connection Faults

Loose or corroded connectors can cause intermittent output loss or complete shutdown.

Look for:

• Sudden performance drops

• Visible wear on cabling or connectors

• Signs of scorching or moisture ingress

Regular inspections can catch these issues before they escalate. (NHBC guidance)

3. Panel Damage and Degradation

Over time, panels may suffer from:

• Cracks in the glass surface

• Discolouration or "hot spots"

• Delamination (layers separating)

Even micro-cracks invisible to the naked eye can reduce output. Storm damage or falling debris often cause visible cracks.

4. Mounting and Roof Issues

Poorly installed mounting can lead to:

• Loose panels in high winds

• Roof leaks around fixings

• Misaligned panels reducing efficiency

NHBC-approved installation methods help prevent these problems – something Solarsmith® always follows.

5. Performance Drops from Shading or Dirt

Leaves, bird droppings, or nearby tree growth can cut output. Keep an eye out for:

• Noticeable dips in your monitoring app’s readings

• Visible dirt build-up on panels

• Seasonal shading changes

A quick clean or trim can restore performance. (Surrey Home Energy Improvement Guide)

When to Call Solarsmith®If you notice any of these signs, it’s worth getting a professional inspection.

We offer:

• Fast call-outs across Surrey, Sussex, and South London

• Repairs for all system types, even if we didn’t install them

• Transparent quotes with no hidden extras

Book your inspection today – Contact Solarsmith® and keep your solar working at its best.