Solar Panel ROI Calculator

Calculate solar panel payback period and 25-year savings. Enter system size, cost, region and degradation rate to see annual savings and ROI.

Solar Panel ROI Calculator

Calculate solar panel payback period and 25-year savings.

System Configuration

System Size (kW)

Cost per kW ($)

Region / Location

Government Incentive (%)

Annual Degradation (%)

System cost$5,000

After incentive$5,000

Daily generation22.5 kWh

Annual generation8213 kWh

Electricity rate$0.05/kWh

Annual Savings

$411

8213 kWh × $0.05/kWh

Payback

12.2 yr

25yr Savings

$9,673

25yr ROI

+93%

25-Year Projection

Year	Savings	Cumulative	Net Position
1	$411	$411	$4,589 left
2	$409	$819	$4,181 left
3	$407	$1,226	$3,774 left
4	$404	$1,630	$3,370 left
5	$402	$2,033	$2,967 left
6	$400	$2,433	$2,567 left
7	$398	$2,832	$2,168 left
8	$396	$3,228	$1,772 left
9	$394	$3,623	$1,377 left
10	$393	$4,015	$985 left
11	$391	$4,406	$594 left
12	$389	$4,794	$206 left
13 ✅	$387	$5,181	+$181 profit
14	$385	$5,566	+$566 profit
15	$383	$5,948	+$948 profit
16	$381	$6,329	+$1,329 profit
17	$379	$6,708	+$1,708 profit
18	$377	$7,085	+$2,085 profit
19	$375	$7,461	+$2,461 profit
20	$373	$7,834	+$2,834 profit
21	$371	$8,205	+$3,205 profit
22	$370	$8,575	+$3,575 profit
23	$368	$8,943	+$3,943 profit
24	$366	$9,309	+$4,309 profit
25	$364	$9,673	+$4,673 profit

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The Solar Panel ROI Calculator estimates the payback period and 25-year savings for a photovoltaic installation. Enter system size in kW, cost per kW, your region (with peak sun hours and electricity rate presets), government incentive percentage and annual panel degradation rate to see when your system breaks even and your total 25-year profit.

How it works

1Enter system size in kW and cost per kW
2Select your region or enter custom peak sun hours and electricity rate
3Set government incentive percentage and annual degradation
4See annual savings, payback period, and year-by-year 25-year projection

Who uses this tool

✓Deciding whether to install solar panels at home
✓Comparing solar ROI across different regions
✓Calculating how government subsidies affect payback period
✓Presenting solar investment case to family or investors

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