วิธีการคำนวณ Solar Panel Payback Period
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A solar panel payback period calculator determines how many years it takes to recoup the cost of a solar installation through electricity savings. After the payback period, all savings are pure profit.
สูตร
payback_years = total_system_cost / annual_savings; or with financing: include interest
- cost
- System cost ($) — Total installed solar system cost
- savings
- Annual savings ($/year) — Electricity bill reduction + incentives
- payback
- Payback period (years) — Years to break even
คำแนะนำทีละขั้นตอน
- 1Payback Period = Net Cost ÷ Annual Savings
- 2Net Cost = System Cost − Grants and Incentives
- 3Annual Savings = kWh generated × electricity tariff
- 425-year ROI = (Total Savings over 25 years − Net Cost) ÷ Net Cost × 100%
ตัวอย่างที่มีคำตอบ
อินพุต
$8,000 system, $1,200/year savings, no grant
ผลลัพธ์
6.7 year payback, break-even in 2032
อินพุต
£7,000 system, £900/year savings, £600 grant
ผลลัพธ์
7.1 year payback
อินพุต
AU$12,000 system, AU$1,800/year savings, AU$3,000 rebate
ผลลัพธ์
5 year payback
คำถามที่พบบ่อย
What is a typical payback period?
5–8 years in sunny regions with good incentives. Up to 10–12 years in cloudier areas. 25–30 year system life = 2–5× return.
Should I buy or lease?
Buy: higher upfront, own all benefits. Lease: lower upfront, limited savings (company keeps most incentives).
What incentives are available?
US: 30% federal tax credit (through 2032). State/local vary. Net metering credits monthly power to grid.
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