Download the Free Solar Savings Calculator (Excel)
Instantly calculate your solar payback, annual savings, and total return with our easy-to-use Excel spreadsheet.
This free tool is perfect for DIY analysis—no signup required.
- • Your system’s true payback period
- • Annual savings on your electric bill
- • Total incentives (federal, state & local)
- • Lifetime savings projection
How It Works
- Download the Excel/Google Sheets file and open it on your device.
- Enter your system size, cost, and solar radiance value (use the map below to find your region’s number).
- Instantly see your payback period, annual savings, and incentives update in real time.
- Adjust inputs (utility rate, degradation, incentives) to compare scenarios.
- Use the built-in charts and tables to plan installations or proposals.
Reference: Solar Radiance Map
Use this map to look up your daily solar radiance (kWh/kWp/day) value.
Why Shop.Solar’s Calculator?
- ✅ No ads or hidden fees—completely free to use
- ✅ Pre-built formulas for real-world accuracy
- ✅ Fully editable inputs so you can tailor every assumption
- ✅ Includes solar tax credits, rebates & incentive adjustments
- ✅ Perfect for homeowners, installers, and sales proposals