When to Replace Your Solar Panels
Average lifespan, warning signs, and whether to repair or replace.
Average Lifespan
25-30 years
Replacement Cost
$10,000 - $25,000
Category
Outdoor
How Long Does a Solar Panels Last?
Solar panels last 25 to 30+ years... and many will keep producing meaningful power for 40 years or more. The panels don't suddenly stop working... they gradually lose a small amount of output each year through a process called degradation.
Modern solar panels degrade at about 0.3% to 0.5% per year according to data from the National Renewable Energy Laboratory (NREL) and real-world studies. That means after 25 years, your panels are still producing 85-92% of their original output. A recent Swiss study of panels installed in the late 1980s found they were still producing over 80% after three decades... destroying the myth that solar panels "die" after 25 years.
The panels themselves are the longest-lasting component of your solar system. The inverter (which converts DC power from the panels to AC power for your home) typically needs replacement every 12-15 years... that's the major maintenance expense during the life of the system. String inverters cost $1,000-$2,000 to replace. Microinverters (one per panel) last 20-25 years but cost more to replace individually.
First-year degradation is slightly higher (1-2%) due to a phenomenon called Light-Induced Degradation (LID). After that first year, the rate stabilizes to the 0.3-0.5% annual decline. Newer n-type panels (most panels sold in 2026) are more resistant to LID than older p-type technology.
Warning Signs It's Time to Replace
Signs your solar panels is failing or going bad
If you're seeing two or more of these, it's time to start shopping.
- ⚠️Noticeable drop in energy production — Monitor your system output monthly. A sudden drop (not seasonal) could mean a panel failure, wiring issue, or inverter problem. Gradual decline of 0.5%/year is normal... 10-20% drop in one month is not.
- ⚠️Inverter error lights or shutdown — The inverter display shows fault codes or the unit stops converting power entirely. Most common issue in the first 15 years. String inverters are single points of failure for the whole system.
- ⚠️Physical damage visible on panels — Cracks, delamination (layers separating), yellowing/browning of the encapsulant, or hot spots visible on thermal imaging. Any of these reduce output and can worsen over time.
- ⚠️Critters or debris under panels — Birds nesting, squirrels chewing wires, or leaves accumulating under panel edges. Pest damage to wiring is a common and underestimated problem.
- ⚠️Roof needs replacement underneath — If your roof is due for replacement... the panels need to come off, roof gets done, panels go back on. This adds $1,500-$3,000 to the roof project. Plan ahead so you're not paying for removal twice.
- ⚠️Technology has dramatically improved — If your 15-year-old panels produce 250W each and current panels produce 400W+... upgrading fewer new panels can match or exceed your old system's output in less roof space.
Should You Repair or Replace?
Individual panel replacement is rare. Most panel failures are covered under the manufacturer's 25-year performance warranty (guaranteed 80-85% output at year 25). If a single panel fails, the manufacturer replaces it.
Inverter replacement is the most common "repair"... expect to replace a string inverter once during the system's life ($1,000-$2,000 installed). Microinverters rarely fail individually but cost $200-$400 each when they do.
Full system replacement only makes sense if: panels are 25+ years old AND you're re-roofing anyway AND current technology would significantly outperform your old panels. In that case, the removal/reinstallation cost ($1,500-$3,000) is already being spent for the roof, so adding new panels makes financial sense.
Do NOT replace a working solar system just because newer panels are more efficient. A system producing 85% of original output is still generating free electricity. The math almost never works out to replace functioning panels.
🔧 Repair if...
- • It's less than 15 years old
- • This is the first major issue
- • Repair cost is under $3,000 - $7,500
- • The rest of the unit is in good shape
🔄 Replace if...
- • It's past 25 years
- • This is the second or third repair
- • Repair quote is over $5,000 - $12,500
- • Newer models would save you money on energy
Replacement cost: A new solar panels typically costs $10,000 - $25,000 installed. Prices vary by region, brand, and complexity of installation.
Cost to Replace a Solar Panels
Full Replacement
$10,000 - $25,000
Labor is typically 30-40% of total system cost is labor/installation. of total cost
Typical Repair
$200 - $2,000
Depending on the issue and your location
Prices vary by region, brand, and complexity. Get at least 3 quotes before committing... and don't automatically go with the cheapest. A bad installation costs more in the long run.
Common Solar Panels Repairs and What They Cost
Solar Panels repair cost breakdown
| Repair | Typical Cost | Notes |
|---|---|---|
| Replace string inverter | $1,000-$2,000 installed | Expected once during system life (year 12-15). The most common major repair. Takes 2-4 hours. |
| Replace individual microinverter | $200-$400 | Less common but happens. Requires accessing the panel. Most have 25-year warranties. |
| Repair damaged wiring (critter damage) | $200-$500 | Squirrels chewing through MC4 connectors or conduit. Install critter guards to prevent recurrence. |
| Replace a single panel | $300-$800 (panel + labor) | Rare. Usually covered under manufacturer warranty for defects. Physical damage (hail, tree branch) may be an insurance claim. |
| Re-flash roof penetrations | $200-$500 | If mounting bolts are causing roof leaks. Should be caught during professional inspection. |
Does Homeowners Insurance Cover Solar Panels Replacement?
Solar panels are typically covered under your homeowners insurance as part of the dwelling (roof-mounted) or other structures (ground-mounted). Covered perils include hail, wind, fire, falling trees, vandalism, and theft.
Important: make sure your insurance policy limit has been increased to account for the value of the solar system. A $20,000 solar installation that isn't reflected in your coverage limit could leave you underinsured if the house is damaged.
Some insurers offer specific solar panel endorsements. Others require you to notify them that panels have been installed. Call your insurer after installation to confirm coverage and adjust your dwelling limit.
Hail damage is the most common solar insurance claim. Modern panels are tested to withstand 1-inch hail at 50+ mph, but severe hailstorms can still crack them. Document any storm damage with photos immediately.
How to Pay for a New Solar Panels
Solar installations run $10,000-$25,000 before incentives. After the federal tax credit and any state/local incentives, the net cost drops significantly.
Federal Investment Tax Credit (ITC): 30% of the total system cost through 2032. A $20,000 system gets a $6,000 federal tax credit. This is a credit (not a deduction)... it directly reduces your tax bill dollar for dollar.
Solar loans: $0-down solar loans at 3-7% are widely available through companies like Sunlight Financial, Mosaic, and GoodLeap. Monthly payment is often less than your current electric bill from day one.
Cash purchase: best long-term ROI because you avoid interest. Payback period is typically 6-10 years depending on your electric rate and sun exposure. After payback, it's free electricity for 15-20+ more years.
Solar lease/PPA: $0 down, lower monthly payment, but you don't own the system and don't get the tax credit. The leasing company does. Generally worse economics than owning unless you can't use the tax credit.
State and utility incentives vary widely. Check dsireusa.org for incentives in your state.
Best Solar Panels Brands
How Long Does It Take to Replace a Solar Panels?
A typical residential solar installation (6-10 kW system) takes 1-3 days of on-roof work. The overall timeline from signing the contract to turning on the system is 2-4 months due to permitting, utility approval, and scheduling.
Timeline breakdown: design and permitting (2-4 weeks), equipment ordering (1-2 weeks), installation (1-3 days), inspection (1-2 weeks), utility interconnection approval (1-4 weeks).
The actual installation day: crew arrives, installs racking on the roof, mounts panels, runs wiring, installs inverter, connects to your electrical panel. Most crews finish in one day for systems under 10 kW.
Best time to install: late winter or early spring. You'll have the system running by summer when energy production (and your electric bill) peaks. Plus, the tax credit applies to the year of installation, so earlier in the year gives you more time to plan your tax filing.
How to Make It Last Longer
- ✓Monitor system output monthly through your inverter app or monitoring portal. Catch problems early before they cost you months of lost production.
- ✓Clean panels 1-2 times per year if you're in a dusty or low-rainfall area. A garden hose from the ground is usually sufficient... no need to get on the roof. Don't use abrasive cleaners.
- ✓Trim tree branches that shade the panels. Even partial shade on one panel can reduce output of the entire string on a string inverter system.
- ✓Inspect the inverter display quarterly. Green light = good. Yellow or red = something needs attention. Error codes are usually searchable online.
- ✓Have a professional inspection every 5 years. They'll check wiring connections, look for critter damage, inspect mounting hardware, and verify output matches expected degradation.
- ✓Keep your roof in good condition underneath the panels. A roof leak under solar panels is more expensive to fix because the panels need to come off first.
What We Recommend
Products that help with solar panels maintenance and replacement.
Enphase IQ8 Microinverter
If you're replacing an old string inverter, microinverters eliminate the single point of failure. Each panel operates independently. 25-year warranty.
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Solar Panel Cleaning Kit (Brush + Squeegee)
Telescoping pole with soft brush and squeegee for ground-level panel cleaning. No ladder needed. Use with a garden hose.
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Bird/Critter Guard Mesh for Solar Panels
Clips to the panel edges and prevents birds, squirrels, and leaves from getting under panels. Stainless steel mesh lasts the life of the system.
View on Amazon →
Prices are approximate and may change. As an Amazon Associate we earn from qualifying purchases at no additional cost to you.
Related Guides
Lifespans and costs are averages based on industry data. Your results may vary based on brand, usage, climate, and maintenance. Consult a professional for specific advice.