Common signs that your solar system needs attention
Solar panels are designed for long service lives, but a complete solar installation contains several different electrical and communication components. Inverters, module-level electronics, wiring, connectors, monitoring gateways and protective devices can develop problems independently.
A drop in electricity production does not automatically mean the solar panels themselves are defective. The important question is whether the problem involves actual generation, monitoring data, normal seasonal changes or a failed component.
1. Your solar system shows zero production
If monitoring consistently reports zero electricity generation during sunny daytime hours, several explanations are possible. The inverter may have shut down, an electrical fault may be preventing operation or the monitoring system may no longer be reporting correctly.
First, check whether the monitoring application identifies an active equipment error or simply shows that communication has been lost. These are different situations requiring different troubleshooting approaches.
Do not assume that replacing the inverter will solve the problem without first confirming the failure.
2. Production is lower than expected
Solar output changes naturally with sunlight, weather, temperature, shading and the time of year. A comparison between a bright summer day and a cloudy winter day is not enough to diagnose a malfunction.
However, a significant unexplained decline compared with similar historical conditions may justify professional testing. Possible contributors include increased shading, soiling, component faults, inverter limitations or individual panels that are not operating correctly.
A technician may compare production records, equipment status and site conditions to determine whether the reduction is abnormal.
3. Your inverter displays an error code
Modern inverters can report grid faults, internal hardware problems, isolation faults, communication failures and other operating conditions. The meaning of an error depends on the manufacturer, model and exact code.
Some alerts represent temporary grid conditions. Others indicate problems requiring inspection or replacement. Repeated faults should not be dismissed simply because the system occasionally resumes producing power.
Helpful information to collect
Photograph the error message or take a screenshot of the monitoring application. Record when the problem began, whether it repeats and the inverter brand and model. This information can help the installer prepare for an informed diagnostic visit.
4. Your electricity bill suddenly increased
A higher utility bill can indicate reduced solar generation, but it can also result from increased household consumption, different weather, electric vehicle charging, rate changes, billing adjustments or changes in when energy is consumed.
California's Net Billing Tariff, sometimes called NEM 3.0, adds another consideration. For new participating customers of Southern California Edison, PG&E and SDG&E, exported electricity generally receives substantially less credit than electricity purchased at retail rates.
This means a system can produce electricity while the homeowner still faces substantial charges, especially when much of the electricity is exported rather than consumed onsite.
Utility billing and solar production should be evaluated together before concluding that equipment is defective. Existing customers may have different tariffs, and municipal utilities operate under separate rules.
5. One panel or part of the array is underperforming
Some monitoring platforms provide individual module information. A single panel consistently reporting much less than neighboring panels may indicate shading, an optimizer or microinverter issue, module damage or another localized problem.
Not every installation offers panel-level monitoring. A string-inverter system may require different tests to isolate a problem.
6. Your monitoring app stopped updating
Missing monitoring information is not proof that the system stopped generating electricity. Internet routers may have changed, Wi-Fi credentials may be outdated, a cellular connection may have expired or a gateway may need attention.
If the app says your equipment is offline, start with the distinction between lost communication and lost production.
Read the separate solar monitoring troubleshooting guide for more information.
What does a professional solar diagnostic visit cover?
A useful diagnostic process starts with the reported symptoms and available system information. The exact inspection scope depends on the installation and must be confirmed with the contractor before service.
- Review the symptoms and system history. The technician can examine fault messages, production records, equipment information and the timing of the reported problem.
- Check equipment condition. An inspection may identify visible damage, overheating evidence, deteriorated connections or other conditions requiring further investigation.
- Evaluate inverter and electrical operation. Appropriate electrical tests can help distinguish inverter faults from problems elsewhere in the system. Only qualified personnel should perform these tests.
- Check monitoring and communication. Production and communication status can be compared to determine whether the issue involves generation, data reporting or both.
- Explain findings and repair options. The homeowner should receive an explanation of the suspected or confirmed failure, recommended next steps and any applicable repair estimate.
Some issues can be isolated during an initial visit. Others require additional testing, manufacturer involvement, replacement components or a follow-up appointment.
Ask whether the diagnostic charge is separate from repair labor and whether additional work requires your authorization.
Repair or replace: how should the decision be made?
Replacing an entire solar installation is not automatically necessary when one component fails. A functioning array may continue to be useful after a compatible inverter, module-level device or communications component is repaired or replaced.
The practical decision depends on equipment age, the specific fault, parts availability, compatibility, electrical safety and the cost of repair compared with appropriate replacement alternatives.
Manufacturer warranty eligibility is another factor. Equipment warranty coverage and installation labor coverage are not necessarily the same.
If the inverter is suspected, read our inverter replacement guide before assuming a particular model or replacement approach is required.
What homeowners can safely check
Some useful observations do not require handling electrical equipment.
- Look for error messages in the manufacturer's app.
- Record the date production appeared to decline.
- Compare recent output with similar past periods.
- Check whether your household internet is working.
- Find installation documents and equipment model numbers.
- Review recent utility bills for unusual changes.
- Observe visible equipment from a safe distance.
Do not attempt unsafe electrical troubleshooting
Do not remove inverter covers, disconnect solar connectors, handle exposed wiring, climb onto the roof or repeatedly reset tripped electrical protection devices. Photovoltaic equipment may remain energized when other parts of the system are switched off.
If you notice smoke, arcing, a burning smell or signs of dangerous overheating, keep clear of the equipment and seek appropriate emergency or qualified electrical assistance. Never touch damaged electrical components.
What if the original solar installer is gone?
A closed installation company does not necessarily mean the system must be replaced. Another qualified installer may be able to inspect and service the equipment.
Brightstone Renewable Energy offers adoption of orphaned solar systems, including inspections, repairs, reconnecting monitoring and help with eligible manufacturer warranty claims across most major brands.
If your original installer is no longer available, visit the orphaned solar systems guide for a more detailed explanation of the takeover process.
Get connected with a licensed Southern California installer
SoCal Solar Help is an independent information and referral website. Solar repair inquiries are referred to Brightstone Renewable Energy, a Brightstone Electric company, California contractor license #1086871.
Brightstone has been in business since 2017 and reports more than 500 completed projects. Its services include solar repairs, maintenance, inverter-related work, battery storage and orphaned system support.
The company reports a service area extending from Lancaster to San Diego. Availability for a particular repair depends on location, equipment and scheduling.
For assistance, call or text (626) 888-7256. Brightstone's stated contact hours are Monday through Saturday, 6 AM to 7 PM.