What is the total lifetime value of going solar?

Solar lifetime value is total electricity savings minus net system cost, both over the system's 25+ year life. For a typical 8 kW system with $1,800/year in savings growing at 4% annually, total savings reach ~$72,000. Minus net system cost of ~$16,000, lifetime value is ~$56,000. This is why solar's ROI rivals or beats most investments.

Does solar increase property value?

Yes — studies by Lawrence Berkeley National Laboratory found solar adds an average of $4,020 per installed kW to home resale value. An 8 kW system adds roughly $32,000 in home value. Buyers are willing to pay more for homes with lower utility costs and clean energy. This property value premium is separate from the electricity savings and further improves the overall investment return.

What is the average total lifetime value of a solar installation?

For a typical 8.5 kW system in the US, lifetime value over 25 years ranges from $30,000–65,000 in electricity savings depending on local utility rates. Higher-rate states like California, Hawaii, and Massachusetts see the upper end of this range. This calculation also considers home value appreciation typically $15,000–25,000 for owned solar.

Does solar increase home value?

Yes. Studies by Lawrence Berkeley National Laboratory and Zillow indicate solar adds approximately $15,000 in value to the average US home, or roughly 4% of home value. The premium is higher in markets with expensive electricity (California, New York) and lower in markets with cheap power. Owned solar — not leased — adds home value.

Lifetime Solar Value Calculator

Calculate the total financial value your solar system generates over its entire life. This calculator accounts for panel degradation, rising electricity rates, and your net system cost to show gross revenue, net profit, and annual value at key milestones.

Net System Cost ($)

Production (kWh/yr)

Electricity Rate (¢/kWh)

Rate Escalation (%/yr)

Degradation (%/yr)

About This Calculator

The Lifetime Solar Value Calculator quantifies the total economic benefit your solar system generates from installation through end of life — typically 25–30 years for modern panels. Unlike a simple payback or ROI calculation, this tool models the two dynamic forces that determine long-term solar economics: panel degradation (which gradually reduces production year over year) and electricity rate escalation (which gradually increases the value of each kWh the system produces). These two trends work in opposite directions, and their net effect determines whether solar value accelerates, stays flat, or declines in real terms over the system lifetime. At typical rates — 0.5% annual degradation, 3% rate escalation — each year's solar value is slightly higher in dollar terms than the year before for the first 15 years, then begins plateauing as degradation accumulates.

The "net system cost" input should reflect your actual out-of-pocket cost after all incentives — the federal ITC, state rebates, and any utility incentives. Using the gross cost before incentives would significantly understate your net profit. For a cash purchase, net cost is straightforward. For a financed system, the true economic cost is more nuanced — use the total loan payments minus the time value benefit, or simply use net installed cost as a first approximation. The lifetime value calculation is most useful as a ceiling number: the maximum possible benefit from your system assuming it performs as rated and rates continue to rise.

Panel degradation is the slow, predictable decline in panel output over time caused by UV exposure, thermal cycling, and minor cell damage. Premium panels from Tier 1 manufacturers typically degrade at 0.4–0.5% per year, reaching about 87–88% of original output at year 25. Budget panels may degrade at 0.7–1.0% per year. Most manufacturer warranties guarantee 80% output at 25 years, implying a maximum of 0.85% annual degradation. A 10,000 kWh/year system at 0.5% annual degradation produces about 8,800 kWh in year 25 — a reduction worth noting but not alarming. The cumulative impact of degradation is modest compared to the upside from rising electricity rates over the same period.

The total lifetime value figure is the single best number to use when evaluating solar as an investment. A $17,500 net-cost system that generates $48,000 in lifetime value represents a $30,500 net profit — equivalent to a 5–6% annualized return on a 25-year investment with no market risk. This compares favorably to bonds and CDs, and unlike financial instruments, solar value is inflation-protected (electricity rates tend to rise with or faster than inflation). The system also provides energy security, hedge value against utility rate spikes, and potential home value appreciation not captured in this purely financial calculation.

Calculations based on NREL solar modeling data and industry-standard assumptions, built and maintained by the independent SolarToolsOnline research team.

Estimates only — not financial, tax, or legal advice. Verify important results with a licensed solar installer or financial professional before making decisions.