One panel damaged? Don't panic.

Maintenance · 29 August 2026 · 6 min read

A homeowner notices a crack in one panel after a storm, or sees the monthly generation drop, and assumes the worst: the whole rooftop plant has to be redone. It almost never comes to that. A solar system is modular by design, and the sensible response is a diagnosis before any replacement.

Signs worth investigating

• Generation noticeably below the same month last year
• An error or warning on the inverter display or monitoring app
• Visible cracks, chipped glass, or a shattered panel after hail or debris
• Brown or discoloured patches on the cells, which can indicate hot spots
• Moisture or condensation visible inside the laminate
• A scorched or discoloured mark near the junction box or a connector

What a proper diagnosis involves

The aim is to find out whether the panel is genuinely faulty, and whether it is the cause or the symptom.

1. Read the inverter logs. Error history and per-string data often point straight to the affected section.
2. Measure string voltage and current. Comparing strings shows whether one is underperforming.
3. Inspect visually. Glass, frame, backsheet, and junction box on every panel, not just the obvious one.
4. Check the connectors. MC4 connectors and cable insulation are a frequent culprit, especially after years of sun and rain.
5. Verify earthing and protection. Isolators, breakers, and surge protection can trip or degrade and mimic a panel fault.
6. Thermal imaging, where needed. This reveals hot spots that are invisible to the eye.

What the problem often turns out to be

In a good share of the "my panel is damaged" calls we attend, the panel is fine. The real cause is something simpler:

• Accumulated dust, bird droppings, or leaf litter reducing output
• New shade from a tree that has grown, or a neighbouring structure that has gone up
• A loose or corroded MC4 connector
• A tripped DC isolator or breaker
• An inverter fault or a monitoring connection that has dropped, so generation looks worse than it is

Each of these is far cheaper to fix than a panel, and none of them require touching the rest of the array.

If a panel does need replacing

Two things matter. First, the replacement should be electrically compatible with the others in that string — a badly matched panel drags the string down toward its own output, so you lose more than one panel's worth of generation. Second, check the warranty position before buying anything: if the panel is within its product warranty and the failure is a manufacturing defect, the claim may cover it. Keep your original invoice, panel serial numbers, and installation documents, since manufacturers ask for them.

Prevention costs less than repair

Most of the faults above announce themselves gradually. A periodic inspection catches a loose connector or an early hot spot while it is still a small job, which is the whole point of our panel cleaning and Annual Maintenance Contract — every visit includes cleaning plus a full check of panels, structure, cabling, earthing, inverter, and safety devices, with a written report and photographs.

If your generation has dropped and you are not sure why, call us on +91 9042517415 and we will help you work out whether it needs a visit.