How to Inspect Solar Panels for Damage — Visual & Electrical Checks

Why Regular Inspection Matters

Regular inspection helps you catch problems early before they cause permanent damage or significant energy losses. We recommend visual inspections every 6 months and professional electrical inspections annually.

Visual Inspection Checklist

• Glass surface: Check for cracks, chips, or impacts from hail or debris
• Cell appearance: Look for browning, yellowing, or dark spots (hot-spot damage)
• Snail trails: Silver or brown lines following cell cracks indicate moisture ingress
• Backsheet: Check for bubbling, peeling, or discolouration
• Frame: Inspect for corrosion, bending, or loose mounting clamps
• Junction box: Check for cracks, loose wires, or signs of overheating
• Connectors: MC4 connectors should be fully engaged and free of corrosion
• Cables: Check for UV damage, cracking, or animal damage

When to Call a Professional

• Visible glass cracks or shattered cells
• Burn marks on backsheet or junction box
• Significant unexplained output drops (>10%)
• Inverter error codes indicating ground faults or insulation failures
• Any signs of water ingress (bubbling, delamination)

Protecting Your Warranty

Document all inspections with photos and dates. LONGi's warranty covers manufacturing defects for 25 years but does not cover damage from improper installation, handling, or maintenance. Keep records to support any warranty claims.

Frequently Asked Questions

How often should I inspect my panels?

Visual inspection every 6 months. Professional electrical inspection (including IR thermal imaging) annually. More frequently after severe weather events.

Can I inspect panels myself?

Visual inspection from the ground or safely from roof edges is fine. Never walk on panels. For electrical testing, always use a qualified technician.

What does a cracked panel look like?

Glass cracks appear as visible lines or spiderweb patterns. Cell cracks may appear as dark lines or brown "snail trails". Internal micro-cracks are invisible to the eye and require EL testing.