Solar Payback Calculator
Calculate how long it takes for a solar panel system to pay for itself through electricity savings.
Simple Payback Period
7.8 years
Simple Payback Period vs Total System Cost
公式
## How to Calculate Solar Payback Period The solar payback period tells you how many years until your solar investment pays for itself. ### Formula **Net Cost = System Cost * (1 - Tax Credit %)** **Payback Period = Net Cost / Annual Savings** The US federal Investment Tax Credit (ITC) is currently 30% through 2032, significantly reducing the effective cost.
计算示例
A $20,000 solar system with 30% tax credit saving $1,800/year on electricity.
- 01Tax credit: $20,000 * 30% = $6,000
- 02Net cost: $20,000 - $6,000 = $14,000
- 03Simple payback: $14,000 / $1,800 = 7.8 years
- 0425-year savings: $1,800 * 25 - $14,000 = $31,000
常见问题
What is a good solar payback period?
A payback period of 6-10 years is typical and considered good. With high electricity rates and strong incentives, some systems pay back in 4-6 years.
Does the payback account for panel degradation?
This simple calculation does not. Panels typically degrade about 0.5% per year, but rising electricity rates usually more than compensate for this.
What incentives are available besides the federal tax credit?
Many states offer additional tax credits, rebates, property tax exemptions, and net metering. SRECs (Solar Renewable Energy Credits) also provide income in some states.