What CalcSolar Does
CalcSolar provides 10 free solar and energy calculators covering every major decision a homeowner faces when considering solar panels, home batteries, or energy efficiency improvements:
- Solar panel savings and 25-year return projection
- Solar payback period with break-even analysis
- IRA federal tax credit (30%) — dollar-for-dollar savings
- Home battery ROI with time-of-use rate modelling
- EV charging cost vs gasoline comparison
- Energy bill savings, net metering, utility rate escalation, generator vs solar, and carbon footprint
Every calculation runs entirely inside your browser using JavaScript. Nothing is ever sent to a server, stored, or shared.
Privacy & Data
We take your privacy seriously. Here is exactly what happens when you use CalcSolar:
- Your numbers are calculated locally in JavaScript — they never leave your device
- No account, login, or personal information is required
- We only store your dark mode preference (
sc-theme) in local storage - Third-party ads (Google AdSense) and analytics (GA4) may use cookies — see our Privacy Policy for details
Our Data Sources
CalcSolar uses publicly available data and standard industry formulas to power its estimates. Default values are drawn from:
- US Energy Information Administration (EIA) — residential electricity rates by state
- National Renewable Energy Laboratory (NREL) — solar irradiance and system performance data
- US Department of Energy (DOE) — energy efficiency benchmarks and cost data
- IRS & Inflation Reduction Act (IRA) — federal solar tax credit rules through 2032
We review and update calculator defaults regularly as rates, incentives, and equipment costs change. All results are estimates — always verify figures with a qualified installer or tax professional before making decisions.
Important Disclaimer
All results produced by CalcSolar are estimates for informational and educational purposes only. They do not constitute financial, legal, tax, energy, or investment advice. Always consult a qualified solar installer, certified financial planner, or licensed tax advisor before making any significant energy investment. Nexus Technologies makes no guarantees as to the accuracy, completeness, or suitability of any calculation results for your specific situation.