When a Solar Array Stops Producing What It Should
A homeowner checks a monitoring app one morning and notices production has dropped by a third since last month. The panels look fine from the driveway. The weather has been clear. Yet the numbers keep falling. This is the moment when solar maintenance and repair separate a system that quietly recovers from one that slowly bleeds value for years. Solar equipment does not usually fail all at once. It degrades in ways that stay invisible until output drops far enough to notice, and by then the underlying problem has often spread.
At F&M Services Group Inc, operating out of our Chester, VA office, we approach solar maintenance and repair as a diagnostic discipline first and a repair task second. A panel that reads low can be dirty, shaded by new tree growth, wired to a failing optimizer, or connected to an inverter that has quietly gone offline. Each of these conditions produces similar symptoms in a monitoring dashboard but requires a completely different response. Serving properties across Central Virginia, Williamsburg, and the Eastern Shore, we trace the fault to its source before we touch a single component, which prevents the common mistake of replacing hardware that was never broken.
How We Diagnose Solar System Problems
Solar troubleshooting starts with data. Before we climb onto a roof in Central Virginia or along the Eastern Shore, we review the system’s monitoring history to establish when production changed and whether the drop is sudden or gradual. A sudden drop points toward a single point of failure such as an inverter fault, a tripped breaker, or a severed connection. A gradual decline more often signals soiling, panel degradation, or a slowly failing string of connections. This history narrows the search before we ever open a junction box.
On site, we test at the component level. We measure open-circuit voltage and short-circuit current at each string, compare optimizer or microinverter readings against expected values, and use thermal imaging to find hot spots that reveal failing cells, damaged bypass diodes, or loose electrical connections generating resistance and heat. Thermal scanning is one of the most valuable tools in solar repair because it exposes problems that no visual inspection would catch. A cell running twenty degrees hotter than its neighbors is failing even if the panel still produces power today.
The most common faults we identify fall into a predictable set of categories:
- Inverter failure – the single most frequent cause of complete system shutdown, since inverters carry the heaviest electrical and thermal load in the system
- Loose or corroded connections – MC4 connectors and junction terminals that loosen over years of thermal cycling
- Microinverter or optimizer faults – module-level electronics that fail individually and drop one panel at a time
- Soiling and shading – dust, pollen, bird droppings, and new vegetation that block sunlight
- Roof penetration leaks – flashing and mount seals that degrade and allow water intrusion beneath the array
Repairs That Protect Both the Array and the Roof
Solar repair is never only about electronics. The array sits on a roof, and that roof is where many solar problems actually begin. When we repair a system in Williamsburg or Chester, VA, we treat the mounting hardware, flashing, and roof surface as part of the job. A failing seal around a mount can allow water into the roof deck long before anyone notices staining on a ceiling. Because F&M Services Group Inc is also a roofing contractor, we address these penetrations correctly rather than sealing over them with caulk that fails within a season. As a GAF Certified and Fortified Roof Certified company, we understand how a solar mount must integrate with the roofing system underneath it.
Inverter repair and replacement makes up a large share of our repair work. String inverters typically last shorter lifespans than the panels they serve, so an aging array often needs at least one inverter replacement across its life. We match replacement inverters to the existing array voltage and current specifications, reconfigure monitoring, and verify that the system returns to full production before we close out the job. For systems built on microinverters or power optimizers, we replace only the failed module-level unit, which restores the affected panel without disturbing the rest of the array.
Panel-level repairs range from replacing cracked glass and damaged backsheets to swapping panels with failed bypass diodes. When a single panel in a string underperforms, it can drag down the entire string, so identifying and isolating that panel restores far more production than its single share would suggest. We also correct wiring faults, replace corroded connectors, and re-secure conduit that has worked loose from thermal expansion over the years.
Ongoing Maintenance That Prevents the Expensive Failures
Most costly solar repairs trace back to small problems that went unaddressed. A loose connector generates heat, the heat degrades the connection further, and eventually it fails or starts a fire. A clogged drainage path lets water pool around a mount until the seal gives out. Scheduled maintenance interrupts these chains before they reach the failure point. For homes and businesses across Central Virginia, Williamsburg, the Eastern Shore, and Chester, VA, we build maintenance around inspection, cleaning, and electrical verification.
A thorough maintenance visit includes several distinct tasks that work together:
- Visual and structural inspection – checking panels for cracks, delamination, and discoloration, and confirming mounts and rails remain tight
- Electrical testing – verifying voltage, current, and connection integrity across every string
- Thermal scanning – locating hot spots that reveal early-stage electrical or cell failures
- Cleaning – removing soiling that reduces output, using methods that will not scratch or stress the panel surface
- Monitoring review – confirming the monitoring system reports accurately so future problems surface quickly
Commercial arrays especially benefit from consistent maintenance because their scale magnifies every loss. A one percent production drop on a residential system is a minor annoyance. The same percentage across a large rooftop commercial solar installation represents real money every month. Whether the system is a small residential rooftop array or a large commercial installation, the underlying discipline stays the same.
Working With F&M Services Group Inc
We are a veteran owned company, and we bring the same commitment to solar maintenance and repair that we bring to every restoration and roofing project. We work throughout Chester, Williamsburg, Central Virginia, and the Eastern Shore, providing personal, professional service focused on completing the work in a timely manner using superior building products. As part of our broader roofing and restoration experience, we understand solar not as an add-on but as a system that must work in harmony with the roof beneath it.
Our goal on every solar repair is straightforward: identify the true cause, fix it correctly, and return the array to the production it was designed to deliver. When you call F&M Services Group Inc, one call does it all, from diagnosis through repair through the roof work that so often goes with it. That integrated approach keeps your system producing and your roof protected for the long life a solar investment deserves.
