How to Decide
Deciding what to do when a solar lease ends starts with understanding your contract and your system's current performance. Most leases spell out end-of-term options: renewal, purchase, or removal, sometimes with a preset buyout formula or a fair market value assessment. Your first step is to review those terms and compare them to current solar prices and your utility rates.
The right choice depends on how much you pay for electricity, how long you plan to stay in the home, and how old and efficient the system is at lease end. If you expect to stay at least 5-10 more years and the system is still producing well, buying or renewing can be attractive; if you may move soon or the system is near the end of its useful life, removal and possibly a new system may be more rational.
Average Lifespan
Most solar panels are designed to last 25-30 years, with gradual performance decline over time. In many leases, the system will be 15-20 years old at the end of the term, meaning it may still work but at a lower output than when it was new. Inverters and other electronics often have shorter lifespans, commonly 10-15 years, and may need replacement during or shortly after the lease period.
Manufacturers typically warrant panels to produce around 80-85% of their original output after 25 years, but real-world performance varies with climate, maintenance, and shading. According to general industry data referenced by the U.S. Department of Energy, modern solar panels usually degrade by about 0.5-1% per year, so a 20-year-old system may produce roughly 80-90% of its initial output depending on conditions.
Repair Costs vs Replacement Costs
At lease end, you should consider potential repair costs if you keep the system versus the cost of a new installation. Replacing a central inverter can cost a few thousand dollars, while fixing wiring or minor component issues is usually cheaper but still adds up over time. If you buy the system, you also take on responsibility for future maintenance that the leasing company previously covered.
By contrast, a new solar system-especially if purchased or financed-may come with updated warranties, higher efficiency panels, and lower per-watt costs than when your lease began. In many markets, the installed cost of solar has fallen significantly over the last decade, so a brand-new system can sometimes deliver more energy for a similar or slightly higher upfront cost than buying your old leased system plus anticipated repairs.
Repair vs Replacement Comparison
- Cost differences
- Lifespan impact
- Efficiency differences
- Risk of future issues
Repairing and keeping an older leased system (by buying it at lease end) usually has a lower immediate cost than installing a brand-new system, especially if the buyout price is modest. However, you must factor in likely future repairs, particularly for inverters and aging components, and compare that to the predictable cost of a new system with fresh warranties.
Replacing the system with a new installation costs more upfront but often delivers higher efficiency and lower long-term energy costs. Newer panels and inverters can produce more electricity from the same roof area, and according to the U.S. Department of Energy, modern residential solar systems are generally more efficient and reliable than systems installed a decade or more ago, which can reduce the cost per kilowatt-hour over the system's life.
When Repair Makes Sense
- Condition where repair is logical
- Condition where repair is cost-effective
Buying and effectively "repairing as needed" makes sense when the system is still relatively young for solar-typically under 15 years old-and has no major known defects. If monitoring data show that output is close to expected levels and the roof is in good condition, keeping the system can be a logical way to extend its value without paying for a full replacement.
It is also cost-effective when the buyout price is low enough that you can recover it in roughly 5-8 years of electricity savings, even after budgeting for occasional repairs. This scenario is more likely if your local electricity rates are high, your home uses a lot of power during the day, and your lease's end-of-term purchase price was set when solar costs were higher than they are now.
When Replacement Makes More Sense
- Condition where replacement is better
- Long-term cost, efficiency, or risk factors
Replacement or removal is usually the better choice when the system is near or beyond 20 years old, has a history of outages, or shows significantly reduced output compared with its original rating. If the roof needs replacement soon, having the leasing company remove the system at the end of the lease can also avoid paying separately for removal and reinstallation.
From a long-term cost and risk perspective, a new system with current technology, strong warranties, and higher efficiency can offer more predictable savings and fewer surprises. If the buyout price is high-approaching the cost of a new system-or if you are uncertain about future repair needs, it is often more rational to decline purchase, let the company remove the old system, and then evaluate a new installation or alternative energy options.
Simple Rule of Thumb
A practical rule of thumb is: consider buying the leased system if the buyout cost is less than about 40-50% of what a comparable new system would cost today and the system is under 15 years old and performing well. If the buyout cost is higher than that, or the system is older than about 18-20 years, it usually makes more sense to let the company remove it and then decide whether to install a new system based on current prices and incentives.
Final Decision
The final decision at the end of a solar lease comes down to comparing the buyout price, expected remaining life and performance of the system, and your plans for the home against the cost and benefits of a new installation or simply returning to utility power. Homeowners who plan to stay long term, face high electricity rates, and have a relatively young, well-performing system often benefit from buying or renewing. Those with older systems, upcoming roof work, or uncertain housing plans are usually better served by removal and a fresh evaluation of their energy options.