Portable Solar Panel Payback Calculator: When Does Your Solar Panel Pay for Itself?
Calculate the break-even point and ROI of a portable solar panel based on your average daily usage, local sun hours, electricity rate, and panel cost. See how fast it pays off.
How Solar Panel Payback Is Calculated
Payback period = upfront cost divided by annual electricity savings. Savings depend on panel wattage, daily peak sun hours, and local electricity rate.
Peak sun hours vary by location: US average 4–5 hours/day. Southwest US 6–7 hrs/day. Northeast US 3–4 hrs/day. Check NREL's PVWatts for your specific location.
How to Use the Solar Panel Payback Calculator
Enter panel wattage and cost
From your panel's product specification (e.g., 100W panel for $120).
Set your peak sun hours
Average daily peak sun hours for your location. US average is ~4.5 hours.
Enter your electricity rate
From your utility bill in $/kWh (US average: $0.16/kWh).
Click Calculate
See daily generation, annual savings, payback period, and 10-year ROI.
Real-World Scenario Example
"A $200, 200W portable solar panel with 5 daily sun hours: generates 310 kWh/year × $0.16 = $49.60/year savings. Payback = 4.0 years. 10-year ROI: 148%."
Inputs
Result
Payback: 4.0 years | 10-year savings: $296 | ROI: 148%
Important Disclaimer
Energy generation estimates assume ideal conditions and an 85% system efficiency factor. Actual output varies based on panel angle, shading, temperature, and weather. This calculator is for planning purposes only.
Related Calculators
EV Home Charging Cost Calculator
Calculate your monthly and annual home charging cost for any electric vehicle. Compare Level 1 vs Level 2 charging, find your cost per mile, and see savings versus gasoline.
Vampire Power Draw Calculator
Calculate how much electricity your devices consume in standby mode (vampire power) and the annual cost to your electricity bill. Find which devices are the biggest energy vampires.
E-Bike vs Car ROI Calculator
Compare the true cost of owning an e-bike versus a car. Calculate your break-even point, annual savings, and 5-year ROI when switching from car to e-bike.