Short Version: The most common solar panel problems are inverter failures and low production from shading or dirt. Wiring faults, roof leaks, and monitoring outages follow closely. Many issues start with a simple check of the inverter, breaker, and monitoring app.
The fix and the cost depend on the warranty and on who owns the system. Lease and PPA providers usually handle repairs, while cash and loan owners rely on warranties.
What Are the Most Common Solar Panel Problems?
The most common solar panel problems involve the equipment around the panels rather than the panels themselves. Inverters, wiring, and roof attachments fail more often than the glass modules. The table below links each symptom to its likely cause and a realistic fix.
| Symptom | Likely cause | Typical fix | Safe for homeowner? |
| System produces zero power | Tripped breaker, failed inverter, utility outage | Reset breaker, then call installer | Breaker reset only |
| Inverter shows red light or error code | Inverter fault, grid voltage issue | Restart per manual, then warranty claim | Restart only |
| Output dropped gradually | Dirt, new shading, aging panels | Cleaning, tree trimming, performance review | Ground-level checks only |
| Output dropped suddenly on part of the array | Failed microinverter, loose connector, damaged panel | Technician diagnosis and part replacement | No |
| Water stain on ceiling | Failed roof flashing or penetration seal | Roofer and installer inspection | No |
| Monitoring app shows no data | Wi-Fi change, communication gateway fault | Reconnect gateway, then call provider | Yes |
| Burn marks or discolored cells | Hot spots, damaged junction box | Panel replacement under warranty | No |
How Do You Tell Normal Aging From a Real Fault?
Normal aging causes a slow, small drop in output each year. Research from NREL shows a median degradation rate of about 0.5% per year. At that pace, a 20-year-old panel still produces roughly 90% of its first-year output.
Degradation can run higher in hot climates and on rooftop systems. Even so, a system that loses 15% in two years has a fault, not normal aging. A sudden drop also points to a fault, because degradation happens gradually.
The cleanest comparison uses the same month across different years. Weather changes output from month to month, so comparing June to January tells you very little. Compare kilowatt-hours for each June, each July, and so on.
What Can Homeowners Safely Check First?
Homeowners can safely complete several checks from the ground before calling anyone. These checks often solve simple outages and give the technician useful information.
- Open the solar monitoring app: Look for a production drop, an offline alert, or a specific panel showing zero output.
- Check the solar breaker: A tripped breaker in the main panel can shut down the whole system.
- Read the inverter display: Write down any error code and the color of the status light.
- Look for new shading: A grown tree, a new building, or a satellite dish can cut output sharply.
- Compare your utility bill: A rising bill with steady usage can reveal low solar production before the app does.
- Photograph everything: Date-stamped photos and screenshots support any later warranty claim.
Do not climb onto the roof or open the inverter. Solar equipment carries high-voltage direct current even when the grid is off. DIY repairs can also void the manufacturer warranty.
Which Problems Need a Professional?
Any problem involving wiring, roof penetrations, or damaged panels needs a licensed technician. These repairs carry electrical risk and can affect roof warranties and homeowner insurance.
Inverter Failures
Solar inverter problems are the most frequent hardware issue in residential solar. A string inverter handles the whole array, so one failure stops all production. A microinverter sits under each panel, so one failure affects only that panel. Inverters usually need replacement before the panels, and their warranties often run shorter.
Roof Leaks and Racking Damage
A solar panel roof leak usually comes from failed flashing or sealant around a mounting bolt. Leaks can stay hidden for months and damage decking or insulation. The installer’s workmanship warranty usually covers leaks tied to the installation, within its time limit.
Wiring Faults, Hot Spots, and Cracked Panels
Loose connectors and damaged cables can cause intermittent output or full shutdowns. Hot spots on solar panels form when cells overheat, often from cracks, shading, or manufacturing defects. Microcracks can grow over time and may require panel replacement rather than repair.
Battery Problems
Battery systems can stop charging, drain too fast, or disconnect from the inverter. Software updates fix some battery faults. Others require a module replacement under the battery warranty.
Who Pays for Solar Panel Repairs?
Ownership type decides who pays for most repairs. The homeowner’s contract defines which party maintains the system and which costs pass to the homeowner.
| Ownership type | Who owns the equipment | Who usually arranges repairs | Who usually pays |
| Cash purchase | Homeowner | Homeowner | Warranty, then homeowner |
| Solar loan | Homeowner | Homeowner | Warranty, then homeowner |
| Solar lease | Provider | Provider | Provider, per contract |
| Solar PPA | Provider | Provider | Provider, per contract |
Loan borrowers often miss one point. The loan payment continues even when the system stops working. The lender and the installer are frequently separate companies, and the lender is not responsible for repairs.
Lease and PPA customers also have limits. Many agreements exclude damage from roof work, storms, or homeowner changes. Homeowners with a Sunrun solar contract or a Tesla solar contract should read the maintenance and exclusions sections closely.
Manufacturer Warranty vs. Workmanship Warranty
A manufacturer warranty covers defects in the panels, inverters, or batteries. A workmanship warranty covers the installer’s labor, wiring, and roof penetrations. The two warranties come from different companies and expire on different dates.
A manufacturer often ships a free replacement part but does not pay for labor. That gap can leave the homeowner paying a technician to install a free part. Disagreements over this split often turn into a solar panel warranty dispute.
What Happens If Your Solar Installer Goes Out of Business?
A solar installer out of business does not erase the manufacturer warranty. Panel and inverter makers usually honor their product warranties directly. The workmanship warranty, however, may disappear with the installer.
Several large residential solar companies have filed for bankruptcy in recent years. Sunnova filed for Chapter 11 in June 2025 and moved to sell its servicing platform. Homeowners in these situations may find their service contact changed to an unfamiliar company.
Monitoring access creates a second hidden problem. Some installers keep the monitoring account in their own name. When the installer closes, the homeowner may lose visibility into the system. Ask the equipment manufacturer about transferring the account to your name.
When Do Solar Panel Problems Become Contract Problems?
Solar panel problems become contract problems when repairs fail and the money still flows. A homeowner paying for power the system does not produce may have a dispute under the agreement.
A production guarantee promises a minimum amount of electricity each year. If output falls short, many contracts require a credit or refund. The homeowner usually must request the payment and show the shortfall.
Other warning signs point beyond equipment. Repeated service requests that go unanswered suggest a breach of the maintenance terms. Savings that never matched the sales pitch can suggest misrepresentation. Missing disclosures can also be signs of solar panel scams.
Gather these documents before taking any formal step:
- The signed agreement, including every addendum and the disclosure form
- Warranty documents for panels, inverters, and batteries
- Monitoring screenshots showing the production drop
- Utility bills from before and after installation
- Every email, text, and service ticket with the provider
The U.S. Treasury, FTC, and CFPB issued a joint consumer advisory on solar that explains where to report deceptive practices.
What Mistakes Make Solar Repairs Harder?
A few common mistakes turn a simple repair into a long dispute. Avoiding them protects both the warranty and any later claim.
- Ignoring the monitoring app: Months of lost production may never be recovered without early records.
- Hiring an unauthorized repair company: Some warranties and lease agreements void coverage for outside work.
- Removing panels for roof work alone: Most lease and PPA contracts require the provider to handle removal.
- Relying on phone calls: Verbal promises are hard to prove, so confirm every request in writing.
- Missing warranty deadlines: Workmanship warranties often expire years before panel warranties.
Get Help With a Solar Agreement That Isn’t Working
Some solar panel problems end with a simple repair. Others reveal an agreement that no longer works for the homeowner. At Solar Exit Plan, we help homeowners understand problematic solar agreements and explore realistic resolution options.
Our team starts with a solar contract review. We read your agreement, warranties, and production guarantee terms. Then we explain what the contract requires from the provider and what options may exist.
Every contract is different, and no exit or outcome is guaranteed. Our review gives you a clear picture before you decide your next step.
Frequently Asked Questions About Solar Panel Problems
What is the most common problem with solar panels?
Inverter failure is the most common problem in residential solar systems. Inverters work harder than the panels and usually wear out sooner. Many homeowners need at least one inverter replacement during the system’s life.
Why are my solar panels producing less electricity than before?
Low solar production usually comes from dirt, new shading, a failed inverter, or a wiring fault. Normal aging causes only a small yearly decline. A large or sudden drop calls for a technician’s diagnosis.
Can I clean my solar panels myself?
Cleaning from the ground with a soft brush and plain water is usually low risk. Climbing onto the roof is dangerous and may breach a lease agreement. Check the manufacturer’s cleaning rules first, because harsh cleaners can void the warranty.
Do I still pay my solar loan if the panels stop working?
Yes, the solar loan payment usually continues even when the system fails. The lender is normally separate from the installer. The homeowner must pursue repairs through the warranty or the installer.
Can solar panel problems let me cancel a solar contract?
Solar panel problems alone rarely cancel a contract automatically. Unresolved failures, missed production guarantees, or misleading sales practices may create options in some cases. The outcome depends on the agreement terms, state law, and the evidence the homeowner keeps.