5 Signs Your Solar Panels Need Immediate Attention: Warning Symptoms, Causes & What Homeowners Should Do

5 Signs Your Solar Panels Need Immediate Attention: Warning Symptoms, Causes & What Homeowners Should Do

If your solar panels suddenly produce far less power, your electric bill jumps, your inverter shows red or flashing lights, or you see visible damage or burning smells, your system needs immediate attention. These warning signs often point to wiring faults, failed components, or safety issues that can get worse if ignored. Most problems are fixable, but the sooner you act, the more energy and money you’ll save. Never try to repair electrical components yourself—when in doubt, shut the system down (if safe to do so) and call a qualified solar professional.

Solar panels are usually low-maintenance, but “set it and forget it” doesn’t mean “ignore it forever.” This guide is for U.S. homeowners who already have solar or are considering it and want to know what real problems look like—and what to do if something seems wrong. We’ll walk through the top warning signs, what they mean, and when you should call your installer or electrician right away.

Table of Contents

• The 5 Biggest Warning Signs Your Solar Panels Need Immediate Attention
• Sign 1: Sudden Drop in Solar Production or Rising Electric Bills
• Sign 2: Inverter Error Lights, Alarms, or Offline Status
• Sign 3: Visible Damage to Panels, Wiring, or Roof
• Sign 4: Burning Smell, Hot Spots, or Buzzing Noises
• Sign 5: Rapid Performance Degradation Over Months or Years
• Key Numbers: Costs, Savings, Lifespan & How Problems Affect Them
• When a Solar Problem Is Truly Urgent vs. Just Annoying
• What Homeowners Should Do Next (Step-by-Step)
• Frequently Asked Questions
• Summary: Key Takeaways & Next Steps

The 5 Biggest Warning Signs Your Solar Panels Need Immediate Attention

Most solar systems run for years with little more than occasional cleaning and basic monitoring. But there are a few clear warning signs that mean you should act quickly:

• Sudden, unexplained drop in solar production (especially compared to last month or last year)
• Electric bills that spike even though your usage hasn’t changed
• Inverter showing red lights, error codes, or going offline for more than a brief period
• Visible damage to panels, glass, frames, wiring, or roof attachments
• Burning smells, hot spots, or unusual buzzing from the inverter or roof area
• Fast performance decline over months or a few years, not just a small seasonal change

Any one of these can signal a safety issue, a failing component, or a problem that will quietly eat into your savings if you ignore it. The rest of this article breaks down each sign, what it usually means, and what you should do.

Sign 1: Sudden Drop in Solar Production or Rising Electric Bills

What this usually means

A sudden drop in solar output is one of the most common signs that something is wrong. You might notice:

• Your monitoring app shows much lower kWh production than usual
• Your electric bill jumps because you’re buying more power from the utility
• Your “net metering” credits are smaller than previous months with similar weather

This can be caused by simple issues like dirt or shade, or more serious problems like a failed inverter, broken panel, or wiring fault.

Key facts and numbers

• Most U.S. residential systems are 5–10 kW, with 15–25 panels.
• On a clear day, a healthy system should produce roughly 4–6 kWh per kW of system size (for example, a 7 kW system might produce 28–42 kWh in good conditions, depending on location and season).
• Normal year-to-year output changes from weather are usually within ±10%.
• A drop of 20–30% or more compared to the same month last year, with similar weather, is a red flag.

Common causes

• New shade from tree growth, a new building, or a neighbor’s addition
• Dirty panels (dust, pollen, bird droppings, ash, or heavy pollution)
• Inverter problems (partial failure, string offline, or microinverter issues)
• Loose or corroded wiring reducing power flow
• Failed panel(s) dragging down a whole string in older string-inverter systems

When it’s normal vs. when to worry

Normal variations:

• Winter production is often 30–50% lower than summer in many states.
• Cloudy weeks, smoke, or storms can temporarily cut output by 50% or more.

Concerning signs:

• Production is much lower than the same month last year with similar weather.
• Your system shows zero or near-zero output on a sunny day.
• Only one part of your array is producing (if you have panel-level monitoring).

What to do next

• Check your monitoring app and compare this month to the same month last year.
• Visually inspect from the ground for shade, debris, or obvious damage.
• If you suspect dirt is the main issue, review safe cleaning practices (see how to clean solar panels and how often you actually need to).
• If output is very low or zero on a sunny day, contact your installer or a licensed solar electrician—this can indicate an inverter or wiring failure.
• For deeper troubleshooting, our guide on why your solar system is producing less than expected explains how to narrow down the cause.

Sign 2: Inverter Error Lights, Alarms, or Offline Status

Why the inverter matters

The inverter is the “brain” of your solar system. It converts DC power from your panels into AC power your home can use. If the inverter is offline or in error, your panels may be producing power, but none of it is reaching your home or the grid.

Common warning signs from inverters

• Red or orange lights instead of solid green
• Flashing LEDs or a fault indicator
• Error codes on the display or in the monitoring app
• Audible alarms or beeping
• Monitoring app shows the inverter as “offline” or “not reporting” for more than a day

Typical causes

• Grid issues (voltage or frequency out of range) causing the inverter to shut down for safety
• Overheating due to poor ventilation or high ambient temperatures
• Internal component failure in the inverter
• Communication problems (Wi-Fi/router issues) that affect monitoring but not necessarily production

When this works in your favor

• Most inverters have 10–12 year warranties, often extendable to 20–25 years.
• If the inverter fails within the warranty period, the manufacturer typically covers a replacement unit (labor may or may not be covered).
• Modern systems with microinverters or optimizers can isolate issues to a single panel instead of taking down the whole array.

When it doesn’t work in your favor

• If your inverter is out of warranty, replacement can cost $1,500–$3,000 including labor, depending on size and type.
• Repeated grid-related shutdowns can reduce your annual production and savings.
• Ignoring error codes can lead to prolonged downtime and lost savings.

What to do next

• Note any error codes or light patterns on the inverter.
• Check if the issue is just monitoring (Wi-Fi/router) or actual production (look at your meter or app).
• Do not open the inverter or attempt internal repairs.
• Contact your installer with the error code and ask if it’s covered under warranty; our guide to solar panel warranty claims also applies to inverters and other components.

Sign 3: Visible Damage to Panels, Wiring, or Roof

What visible damage can look like

Even if your system still seems to be working, visible damage is a sign you should act quickly. Look for:

• Cracked or shattered glass on any panel
• Hot spots or discoloration under the glass
• Warped, bent, or corroded frames
• Loose, hanging, or chewed wiring (often from squirrels or birds)
• Loose mounting hardware or panels that appear lifted from the roof
• Roof leaks or water stains inside the house near where panels are mounted

Key facts and risks

• Panels are designed to withstand hail up to about 1 inch at high speed, but larger hail or flying debris can still cause cracks.
• Cracked glass can allow moisture intrusion, leading to corrosion and electrical faults.
• Damaged wiring can cause short circuits, ground faults, or fire risk.
• Improper or loose mounting can lead to roof leaks and structural damage over time.

When damage is mostly cosmetic

• Minor frame scratches or small chips on the frame (not the glass) usually aren’t urgent.
• Light surface dirt or bird droppings are more of a performance issue than a safety issue.

When damage is urgent

• Any cracked or shattered glass on a panel
• Exposed wiring or junction boxes
• Panels that appear loose, tilted, or moving in the wind
• Active roof leaks under or near the array

What to do next

• Do not climb on the roof or touch damaged panels or wiring.
• Take clear photos from the ground or a safe vantage point.
• Contact your installer to assess whether the damage is covered under product, workmanship, or insurance.
• For more detail on what different types of damage look like, see our guide on how to spot solar panel damage before it costs you.
• If a panel is clearly broken or not working, our article on what to do if a solar panel breaks or stops working walks through the replacement process.

Sign 4: Burning Smell, Hot Spots, or Buzzing Noises

Why this is serious

Any burning smell, unusual heat, or buzzing from your solar equipment is a potential safety issue. While solar systems are very safe when installed correctly, they do carry high DC voltages and AC currents. Faulty connections or damaged components can overheat and, in rare cases, cause fires.

Warning symptoms to watch for

• Burning plastic or electrical smell near the inverter, combiner box, or roof area
• Inverter or electrical boxes that feel unusually hot to the touch (without touching bare conductors)
• Buzzing, crackling, or popping sounds from electrical equipment
• Visible scorch marks, melted plastic, or discoloration on or near equipment

Possible causes

• Loose or failing electrical connections creating resistance and heat
• Overloaded circuits or incorrect wiring
• Water intrusion into junction boxes or inverters
• Rodent damage to wiring causing shorts

What to do immediately

• If you smell burning or see smoke, treat it as an emergency.
• Follow the shutdown procedure on your system’s label (usually turning off the AC disconnect and then the DC disconnect).
• Keep a safe distance and call your installer or a licensed electrician right away.
• If you see active flames or heavy smoke, call 911 first.

When it works in your favor

• Most serious electrical issues show early warning signs (smell, noise, heat) before becoming dangerous.
• Modern equipment includes safety shutoffs and arc-fault detection to reduce fire risk.

When it doesn’t

• Ignoring these signs can lead to equipment failure, roof damage, or fire.
• Improper DIY work on electrical components can void warranties and create hazards.

Sign 5: Rapid Performance Degradation Over Months or Years

Normal vs. abnormal degradation

Solar panels slowly lose output over time, but the decline should be gradual. Most modern panels are warranted to produce at least 80–85% of their original output after 25 years. That works out to roughly 0.5–0.7% loss per year.

Rapid degradation means you’re seeing a much faster drop, such as:

• Loss of 5–10% or more in just a few years
• Some panels performing much worse than others of the same age
• Overall system output falling well below the manufacturer’s performance warranty

Key numbers to know

• Typical performance warranty: 25–30 years, promising at least 80–85% of original output at the end.
• Expected annual degradation: about 0.5–0.7% per year.
• If you see 2–3% per year or more over several years, that’s a concern.

Common causes of rapid degradation

• Manufacturing defects in the panels
• Potential-induced degradation (PID) or other electrical stress issues
• Extreme environmental conditions (very high heat, heavy pollution, salt spray) beyond what the panel was rated for
• Persistent shading or soiling causing hot spots and long-term damage

When this works in your favor

• Rapid degradation that falls outside the performance warranty may qualify you for panel replacement under warranty.
• Panel-level monitoring makes it easier to prove that specific modules are underperforming.

When it doesn’t

• If the issue is due to improper installation, lack of maintenance, or environmental factors not covered by warranty, you may have to pay for replacements.
• Underperforming panels quietly reduce your long-term savings and extend your payback period.

What to do next

• Use your monitoring system to compare current output to the first year’s performance, adjusting for weather.
• Document trends over several months or years.
• Contact your installer or panel manufacturer with your data and ask if it meets the criteria for a performance warranty claim.
• Our article on how to make a solar panel warranty claim and what’s covered explains how to navigate this process.

Key Numbers: Costs, Savings, Lifespan & How Problems Affect Them

Typical system costs and savings

Understanding the basic economics of a solar system helps you see how maintenance issues impact your bottom line.

• Average system cost (U.S.): $28,000–$32,000 before incentives for a typical residential system.
• With the 30% federal Investment Tax Credit (ITC) through 2032, net cost often drops to about $19,600–$22,400 (consult a tax professional to confirm your eligibility).
• Cost per watt: typically $2.50–$3.50, depending on location, equipment, and installer.
• Average annual savings: about $1,300–$1,500 on electricity bills for a typical U.S. home.
• Payback period: national average of about 7–9 years, with panels lasting 25–30 years or more.

How maintenance problems change the math

• A system that underperforms by 20–30% due to ignored issues can add 2–4 years to your payback period.
• Prolonged inverter failure (months instead of days) can cost you hundreds of dollars per year in lost savings.
• Severe roof leaks or electrical damage can lead to thousands of dollars in non-solar repairs.

What affects your specific numbers

• Location: High-sun states (AZ, NV, CA, TX, FL) see more production and faster payback; cloudy or northern states see less but can still benefit.
• Utility rates: Higher electricity prices mean each kWh your system produces is worth more.
• System size and orientation: South-facing roofs with minimal shade perform best; east/west or shaded roofs produce less.
• Maintenance and uptime: Systems that are monitored and maintained tend to stay closer to their expected output over decades.

When solar still works in your favor

• Even with occasional repairs, most systems deliver decades of net savings if issues are addressed promptly.
• Many major components (panels, inverters, racking) are covered by long-term warranties, reducing your out-of-pocket risk.

When it might not

• If your system is poorly installed and you face repeated issues, the hassle and repair costs can eat into your savings.
• Homes with heavy shade, complex roofs, or very low electricity rates may see longer payback periods, making maintenance problems more painful.

When a Solar Problem Is Truly Urgent vs. Just Annoying

Urgent issues (act immediately)

• Burning smell, smoke, or visible scorching on equipment
• Cracked or shattered panels with exposed wiring
• Inverter showing critical error codes and no production on a sunny day
• Roof leaks under or near the solar array
• Loose or hanging wires that could be touched or damaged further

Soon-but-not-emergency issues

• Noticeable but not extreme drop in production over a few months
• Dirty panels reducing output but not causing safety concerns
• Monitoring app offline while the system still appears to be producing (meter spinning backward, etc.)
• Minor cosmetic damage to frames or racking

How to prioritize

• If there is any sign of heat, burning, or electrical arcing, shut down the system (if safe) and call a professional immediately.
• If the issue is mainly lost production (no safety signs), schedule service as soon as practical to protect your savings.
• If you’re unsure, err on the side of caution and avoid DIY electrical work.

What Homeowners Should Do Next (Step-by-Step)

1. Check your monitoring and basic indicators

• Open your monitoring app or web portal and compare current production to:
• • Yesterday or last week (for short-term changes)
  • The same month last year (for seasonal comparison)
• Look at your inverter lights and note any error codes or colors.
• Review your latest electric bill for unexpected increases.
• If you’re not sure how to read your data, see our guide on how to monitor your solar system’s performance.

2. Do a safe visual inspection from the ground

• Walk around your home and look at the array from different angles.
• Check for:
  • New shade from trees or structures
  • Obvious dirt, snow, or debris on panels
  • Visible damage to glass, frames, or wiring
• Do not climb on the roof or touch electrical components.

3. Decide if it’s a DIY-friendly issue or professional-only

Generally safe for homeowners:

• Basic panel cleaning with proper tools and safety precautions
• Resetting monitoring connections (Wi-Fi, app logins)
• Trimming small branches on your property (if safe and legal)

Professional-only:

• Any electrical work (wiring, breakers, inverter internals)
• Panel replacement or roof penetrations
• Diagnosing error codes you don’t understand

4. Gather information before calling an installer

• System size (kW) and installation date
• Equipment brands and model numbers (panels, inverter)
• Photos of any visible damage or error screens
• Recent production data (screenshots from your monitoring app)
• Copies of your warranties and installation contract, if available

5. Decide if it’s time to get multiple quotes

• If your original installer is out of business or unresponsive, it’s wise to get quotes from multiple qualified solar companies for repairs or upgrades.
• For older systems (10+ years), you might compare:
  • Repairing or replacing a single component
  • Upgrading to newer, more efficient equipment
• Multiple quotes help you understand fair pricing and whether a recommended repair is truly necessary.

6. Consider long-term maintenance

• Regular inspections and light maintenance can prevent many urgent issues.
• Our overview of whether regular solar panel maintenance is worth the investment explains what’s typically included and when it pays off.

Frequently Asked Questions

Summary: Key Takeaways & Next Steps

• A sudden drop in production, inverter errors, visible damage, burning smells, or rapid long-term degradation are the main signs your solar panels need immediate attention.
• Most U.S. systems cost around $28,000–$32,000 before incentives and are expected to last 25–30 years, so protecting that investment with timely repairs matters.
• Location, roof conditions, equipment quality, and maintenance habits all strongly affect your real-world savings and how often issues appear.
• Handle only basic checks and cleaning yourself; leave electrical work, roof penetrations, and diagnostics to qualified professionals.
• If you’re seeing any of the warning signs in this article, gather your system information and production data, then talk to reputable installers or service providers about your options.

If your solar panels are showing any of these warning signs, getting a personalized assessment and quote is the best way to understand your options and costs. A few quick conversations can clarify whether a simple repair, warranty claim, or equipment upgrade makes the most sense for your home. When you’re ready, you can compare offers from vetted installers at /get-my-quote/ with no pressure and no obligation.