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Solar Panel Replacement Cost Calculator
Get a cost estimate for replacing an aging solar system — panels, inverter, or both. See your total cost range, cost per watt, and an itemized breakdown.
Educational calculators — always consult a licensed professional before making financial decisions.
Aging solar systems (typically 15–25 years old) may need panels, the inverter, or both.
Full system replacement — panels and inverter both swapped. Effectively a new install.
Larger systems cost more overall but typically have a lower cost per watt.
Most common residential system size.
Only relevant if your replacement includes the inverter.
Cheaper option. Single point of failure — if it fails, the whole system stops producing.
Select the option that applies. Old panel removal, roof repair, or a monitoring upgrade all add to the total.
No additional work needed beyond the panel/inverter replacement.
Total replacement cost
$15,000 – $22,500
Panels + Inverter — 6 kW system, including selected options
Cost breakdown
Where Your Money Goes
Panel lifespan
Solar panels typically degrade about 0.5% per year and are usually warrantied to 25 years at 80–85% of original output. Replacement is often driven by inverter failure (10–15 year lifespan) or panel damage well before panels themselves wear out.
Tax credit note
The federal residential solar tax credit (Section 25D, 30%) expired for expenditures made after December 31, 2025, so most panel and inverter replacement or repair work performed in 2026 does not qualify for a federal credit. Check for state or utility rebate programs in your area, and consult a tax professional for your specific situation.
Estimates reflect national averages for educational purposes only. Material prices and labor rates vary by region. Always get 2–3 quotes before proceeding.
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What you'll need
- ·What's failing — panels, inverter, or both
- ·Current or target system size (4kW–12kW+)
- ·Inverter type preference (string or microinverters)
- ·Whether you need old panel removal, roof repair, or a monitoring upgrade
What you'll get
- ✓Total replacement cost range — Panels, inverter, and add-ons
- ✓Cost per watt — Compare against new-install pricing
- ✓Removal & disposal estimate — For old panels taken off the roof
- ✓Itemized cost breakdown — Panels, inverter, roof repair, monitoring
Solar replacement cost overview
Panels degrade about 0.5% per year and are typically warrantied to 25 years at 80–85% of original output. The federal residential solar tax credit (Section 25D) expired for expenditures after December 31, 2025, so most replacement work in 2026 does not qualify for a federal credit — check state or utility rebate programs and consult a tax professional.
How it works
Tell us what's failing
Panels only, panels + inverter, or just the inverter — aging systems (15–25 years) often need one or the other, not always both.
Select system size & inverter type
4kW–12kW+ system size, plus string inverter (cheaper) or microinverters (more efficient, better monitoring).
Add removal, roof work, or monitoring
Old panel disposal, roof repair while panels are off, or a monitoring upgrade — each adds to the total.
Solar Panel Replacement Cost by Scope
| Replacement Scope | System Size | Cost Range |
|---|---|---|
| Panels Only | 6 kW | $9,600–$14,400 |
| Panels + Inverter | 6 kW | $15,000–$22,500 |
| Panels + Inverter | 10 kW | $25,000–$37,500 |
| String Inverter Only | Any size | $1,200–$2,800 |
| Microinverters Only | 6 kW (~15 panels) | $2,700–$3,900 |
The federal residential solar tax credit (Section 25D) expired for expenditures after December 31, 2025 — most 2026 replacement work does not qualify. Check state or utility rebate programs and consult a tax professional.
When to replace vs. repair
Solar panels are the most durable part of the system — they typically last 25–30+ yearsand degrade only ~0.5%/year. The inverter usually fails first: string inverters last about 10–15 years, while microinverters carry 20–25-year warranties. So the most common "replacement" is actually just an inverter swap, not the whole array.
- Repair / swap the inverter when panels are fine but production dropped after 10–15 years.
- Replace individual panels for physical damage (cracks, hot spots, delamination) — often covered under warranty.
- Replace the whole system when a 20+ year old array's output has fallen well below your needs, or you're re-roofing anyway.
Signs you need a replacement
- A steady, unexplained drop in monitored production beyond the normal ~0.5%/year.
- Visible damage — micro-cracks, brown "hot spots," delamination, or moisture under the glass.
- Repeated inverter faults or a red/blinking status light.
- The panels predate current standards and replacement parts are hard to source.
What you can reuse — and what to check
If the racking and wiring are in good shape, they can often be reused, which cuts replacement cost. But if you're replacing a whole aging system, it's usually worth upgrading to higher-wattage panels and modern microinverters at the same time. Always confirm what's still under warranty — many panel and inverter defects are covered for 25 and 12–25 years respectively. Note the 30% federal residential credit (Section 25D) expired after December 31, 2025, so it does not apply to 2026 replacements.
About this calculator
How much does it cost to replace solar panels?+
Replacing panels only (keeping the existing inverter and wiring) typically costs $1.60–$2.40 per watt, or roughly $9,600–$14,400 for a 6 kW system. A full panel + inverter replacement runs $2.50–$3.75 per watt, similar to a brand-new install, or about $15,000–$22,500 for the same 6 kW system.
How long do solar panels last before needing replacement?+
Most solar panels are warrantied for 25 years and degrade only about 0.5% per year, meaning they still produce 80–85% of their original output at the end of that period. Many systems continue producing usable power well beyond 25 years, but efficiency losses, physical damage, or outdated technology often prompt replacement sooner.
Is it cheaper to replace panels or the inverter?+
Replacing just the inverter is almost always cheaper than replacing panels. A string inverter replacement costs $1,200–$2,800 flat, while microinverters run $180–$260 per panel. Inverters typically fail before panels do — they last 10–15 years for string inverters versus 25+ years for panels — so an inverter-only replacement is a common and cost-effective fix.
Do I need a permit to replace solar panels?+
In most jurisdictions, yes — replacing panels or the inverter typically requires an electrical permit and, in some cases, a building permit, especially if roof work is involved. Your installer usually handles permitting, but requirements vary by city and utility. Check with your local building department before work begins.
Does solar panel replacement qualify for a tax credit?+
No — the federal residential solar tax credit (Section 25D, previously worth 30%) expired for expenditures made after December 31, 2025. Most panel and inverter replacement or repair work performed in 2026 does not qualify for a federal credit. Check for state or utility rebate programs in your area, and consult a tax professional for guidance specific to your situation.
Can I replace just a few panels instead of the whole system?+
Yes, in many cases. If only a few panels are damaged or underperforming, they can often be replaced individually, especially with microinverter or power-optimizer systems where each panel operates independently. With a string inverter setup, mismatched panel ages or specs can slightly reduce efficiency, but partial replacement is still usually possible.
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Back to the calculator ↑Solar Panel Replacement Cost Calculator is built and maintained by the RealCostIQ editorial team. Cost ranges and rates are checked against published industry data and contractor quotes, and revised when the underlying figures move. Read our data methodology or more about who builds this. Every calculation runs in your browser — no account, and none of your inputs are stored.
Cost ranges and rates here are checked against contractor quotes and published industry data. If a number still looks off, email Support@RealCostIQ.com and we'll review and fix it.