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Payback Period
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20-Year Total Savings
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Annual Savings
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Net System Cost (After Incentives)
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20-Year ROI
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The solar payback period is calculated by dividing the net cost of your solar system (after incentives) by your annual electricity savings. For example, if your system costs $20,000 after incentives and saves you $2,000 per year, your payback period would be 10 years.
Key factors include system cost, local electricity rates, available incentives, solar panel efficiency, roof orientation, shading, and local sun exposure. Higher electricity rates and better incentives typically improve ROI.
Solar ROI is calculated by dividing your total savings over the system's lifetime by the initial investment, then multiplying by 100. Most solar systems provide 15-25% annual returns over their 25+ year lifespan.
Solar panels are typically worth it if you have high electricity bills, good sun exposure, and available incentives. Most systems pay for themselves within 6-10 years and provide decades of free electricity afterward.
The federal solar Investment Tax Credit (ITC) allows you to deduct 30% of the cost of installing a solar energy system from your federal taxes. This credit is available through 2032, then steps down to 26% in 2033 and 22% in 2034.
Most solar panels come with 25-year warranties and can last 25-30 years or longer. Panel efficiency typically degrades by about 0.5% per year, meaning they'll still produce about 85-90% of their original output after 25 years.