Reinstall Old Solar Panels or Buy New: Which Is Right for Your Home
Written by HyreSolar Research Desk Primary-source research and fact checking
Quick answer
Reinstall Old Solar Panels or Buy New comes down to upfront cost, lifetime savings and how long you plan to stay in the home; here is each factor side by side.
Reinstalling is cheaper on the day and keeps a system that still works. Buying new costs more but resets the warranties and usually puts much more power on the same roof.
NREL’s end-of-life guidance says that when a roof has to be replaced, many owners find it more cost-effective to remove the older system and install a new one, and that many contractors refuse to offer or warrant reinstallation of old equipment.
Cost side by side
Installed prices as other publishers state them, gross of incentives. Each range is the median published low to the median published high across at least 12 dated sources, retrieved October 21–22, 2026; the source rows sit on the linked cost page.
| Option | Published range | Sources |
|---|---|---|
| Reinstall: detach and reset | $225/panel–$375/panel | 12 dated |
| New: typical installed system | $22,100–$27,500 | 14 dated |
No 30% federal credit is subtracted: Section 25D ended for expenditures after December 31, 2025.
Reinstall vs new on the factors that differ
| Reinstall the old panels | Install a new system | |
|---|---|---|
| Upfront cost | Labor to detach, store and reset, plus any new flashing and parts | A full system price, less nothing: no federal credit since 2026 |
| Warranties | Original product warranties may continue; workmanship on the reinstall depends on who does it, and some contractors will not warrant it | New product, power and workmanship warranties start over |
| Output | What the old panels make today, minus continued degradation | Usually more watts on the same roof area, from larger modern modules |
| Permits and utility | Often a permit and re-inspection; ask whether your utility needs notice | New permit, inspection and interconnection approval |
| Who will do it | The original installer, if still in business; others may decline another company’s work | Any installer |
| Waste | None | Old panels to reuse or recycle |
Contractor refusal and the reroof trigger: NREL/TP-5C00-78678.
Cost side by side
Reinstallation is priced per panel by many sources, but we do not print a range yet: fewer than 12 comparable dated prices exist in one unit. The sources we found are listed on the removal and reinstall cost page. Whatever the figure, it buys you back only the system you already had.
A new system is priced in the table above. The real comparison is reinstall price against new-system price minus the value of what the new system adds: more kilowatt-hours a year, fresh warranties, and no second detach-and-reset when the roof is next touched.
Savings over 25 years
Start from how old the panels are. NREL’s review of published degradation rates puts the median loss at about 0.5% a year (mean 0.8%).
A 10-year-old array is close to new output and has 15 years of warranty left; reinstalling it is usually the better money.
A 20-year-old array is still producing, but its warranties are nearly over and its modules are far smaller than current ones.
The roof decides the timeline. A new roof lasts decades. Putting a 20-year-old array on it means the panels will likely need replacing before the roof does, which brings back a second removal job.
A new system on a new roof lines both lifespans up. If your roof is not yet due, the roof-before-solar check helps you time it.
Old equipment can be hard to match. If a panel breaks during removal, an identical replacement may no longer be made, and inverters have their own matching rules.
Panel safety listings have also changed: one manufacturer’s data sheet notes UL 61730 superseded UL 1703 for modules from December 4, 2019. Ask your installer and building department whether reinstalling older listed equipment raises any question locally.
What a reinstall quote should include
- 1Removal, storage and reset, itemised
Ask whether storage on site during the reroof is extra, and for how long the price holds.
- 2New flashing and mounts
Old penetrations should not be reused in a new roof; the quote should include new flashed attachments.
- 3Breakage terms
Who pays if a panel cracks during removal, and what replaces it if the model is discontinued.
- 4Re-commissioning and a production test
The system should be tested and the monitoring confirmed working after reset.
- 5A written workmanship warranty on the reinstall
Including leaks at the new penetrations, and a single name responsible between the roofer and the solar company. See workmanship vs manufacturer warranty.
Which to choose if…
- 1The panels are under about 12 years old and working
Reinstall, using the original installer if possible, with the warranty position confirmed in writing.
- 2The panels are near the end of their warranty
Get a new-system quote alongside the reinstall quote; compare kWh per year and warranty years, not just price.
- 3No one will warrant the reinstall
That is a strong reason to go new; an unwarranted roof penetration is a leak risk on your new roof.
- 4You are moving and want to take the panels
That is a new installation at the new house; see moving solar panels.
When you are ready
Ready to explore solar for your home?
If you have done your research and want to speak with a solar professional, HyreSolar can help you explore available options.
Free, with no obligation: a person at HyreSolar reads your request and gets back to you about it. Matching with solar professionals is not live yet, so this is not a quote, and nothing is shared with anyone until you agree.
Keep learningQuestions
Can old solar panels be reinstalled after a new roof?
Is it cheaper to reinstall or buy new solar panels?
Does removing panels void the warranty?
Sources & retrieval dates
- NREL, Best Practices at the End of the Photovoltaic System Performance Period (NREL/TP-5C00-78678, 2021) , “The need to reroof a building is another trigger, with many owners finding it more cost-effective to remove the older system and install a new one rather than reinstall the old equipment. (Many contractors also refuse to offer or warrant reinstallation of old equipment.)” Read from the New Jersey DEP copy. Retrieved 22 October 2026.
- Jordan and Kurtz, Photovoltaic Degradation Rates: An Analytical Review (NREL, 2012) , Median 0.5%/yr, mean 0.8%/yr. Retrieved 22 October 2026.
- GAF Energy, Timberline Solar ES technical data sheet (12-2021) , Footnote: UL 61730-1 and UL 61730-2 superseded UL 1703 effective 12/4/19. Retrieved 22 October 2026.
HyreSolar does not install, finance or sell solar. This page is general information, not tax, legal or financial advice; terms, prices and rules vary by state, utility and contract.