Solar PV systems are long-life assets, but they’re not immune to failure. Whether installed on a school or commercial office building, ignoring subtle signs of degradation or electrical fault can cost thousands in lost generation or trigger serious safety or breakdown issues. Knowing how you can tell your system might need a maintenance inspection is essential, especially when your business depends on reliable energy output.
Here’s how to recognise when it might be time to call in a solar maintenance specialist.
Signs of physical damage
Many solar system issues start with physical wear or damage. Some of these might be visible, others hidden until it’s too late.
Cracked or shattered panels are an obvious issue, but also a major concern. While they may continue to produce power, the risk of internal arcing or water ingress rises dramatically. You might also spot discolouration, burn marks or dark patches on the panels these often indicate hotspots forming due to internal cell failure or contamination.
Panel mounting hardware can loosen over time, particularly on exposed or wind-prone rooftops. If panels are looking like they have shifted position, sagged, or detached from the rails, it’s time for an urgent inspection.
Delamination, where the layers of the solar panel begin to separate, is a strong sign of UV or moisture damage. This often signals end-of-life for affected modules.
These issues can directly reduce system efficiency or cause long-term electrical faults if ignored.
Spotting electrical issues
Physical signs can be an obvious sign that your solar system might need a maintenance inspection, but electrical issues might be more subtle and are not always visible.
Wiring corrosion is common in older systems or those in coastal, salt affected, areas. Even sealed connectors can degrade over time, leading to voltage drops, leakage currents or intermittent faults.
Rodent damage is a surprisingly frequent problem. Birds and squirrels often nest near rooftop systems and chew through cable insulation, creating short circuits or triggering residual current devices.
Isolators and breakers can also fail, especially if exposed to load while switching or subjected to weathering. Burn marks or melted plastic around switches is a clear signal the system needs urgent attention.
If you have moisture inside junction boxes, inverters or combiner boxes, that’s a major red flag. Once water infiltrates the system, it can cause immediate failure or long-term corrosion that’s harder to trace.
Noticing inverter problems
Inverters are central to solar system, but they don’t last forever. They’re typically rated for 10–15 years and can be the first component to fail in a commercial installation.
Warning lights or fault codes on the inverter should never be ignored, even if the system seems to be operating well. Fault logs can provide early signs of string imbalance, voltage irregularities or overheating.
Complete inverter shutdowns during daylight hours are an unmistakable sign something’s wrong. This might be ab internal component failure, grid disconnection or DC-side faults.
Breakers tripping frequently could indicate inverter overload or insulation faults within the DC wiring.
Your inverter is essentially the diagnostic hub of the system. If it’s behaving erratically, the rest of the system is likely suffering too.
Looking out for system performance loss
If your energy generation is falling behind expectations, don’t assume it’s just the weather. This could be a sign that your solar system needs a maintenance inspection
A drop in daily or monthly output, even by 10–15%, can signal a problem that’s slowly getting worse. This could be down to panel soiling, degradation, shading, or failing MLPE devices like optimisers or microinverters.
Sudden spikes in your electricity bills may suggest your solar system isn’t offsetting demand as it used to. If you’re relying on solar to power warehousing, data centres or lighting systems, this can have real operational impacts.
Inconsistent string performance, if detectable through your monitoring system, is often the first sign of a fault in a specific module or string.
And if there’s zero output on sunny days, the system may have shut down altogether.
Ongoing monitoring of problems
Monitoring systems are supposed to keep you informed. When they go quiet, something’s likely to be wrong.
If your online dashboard hasn’t updated in days or is showing gaps in data your inverter, data logger or comms system could be offline. And if the data that is coming through looks erratic or doesn’t match historical trends, deeper diagnostics are needed.
For large installations, data reliability is essential for a range of issues, including performance management, compliance, reporting and warranty support.
Knowing when to get a solar maintenance inspection
Even if none of the above issues are visible, your system should be professionally inspected ideally at least every 12 months. A proper inspection includes thermal imaging, string voltage testing, inverter analysis and full visual checks.
Solar systems don’t fail overnight. But when signs appear, acting quickly can prevent expensive downtime and keep your investment producing clean, reliable power for many years.
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