Terms of Service

Last updated: May 28, 2026

1. Acceptance of Terms

By accessing or using SolarCalc.fyi (the "Site"), you agree to be bound by these Terms of Service. If you do not agree, please do not use the Site.

2. Description of Service

SolarCalc.fyi provides a free, online off-grid solar system calculator tool for informational and educational purposes. The Site generates estimates based on user-provided inputs and publicly available solar data from the National Renewable Energy Laboratory (NREL).

3. No Professional Advice

The information provided by SolarCalc.fyi is for general informational and educational purposes only and does not constitute professional engineering, electrical, financial, or legal advice.

Solar system design involves complex factors including local building codes, electrical safety requirements, site-specific conditions, and equipment specifications. Always consult a licensed professional engineer or certified solar installer before designing, purchasing, or installing any solar energy system.

4. Estimates Only — No Guarantee

All calculations, estimates, and recommendations provided by the Site are estimates only. Actual system performance, energy production, and costs may vary significantly due to:

  • Local weather patterns and microclimates
  • Equipment efficiency variations and manufacturing tolerances
  • Installation quality and system configuration
  • Shading, panel orientation, tilt angle, and mounting conditions
  • Wire losses, temperature derating, and inverter efficiency
  • Changes in equipment prices, labor costs, and incentive programs
  • Local permitting requirements and utility policies

We make no guarantees, express or implied, regarding the accuracy, completeness, or applicability of any results obtained from the Site.

5. User Responsibility

You are solely responsible for:

  • The accuracy of the data you input into the calculator
  • Verifying any calculations or recommendations with a qualified professional
  • Compliance with all applicable laws, codes, and regulations
  • Any decisions or actions you take based on information from the Site

6. Intellectual Property

All content on the Site, including text, graphics, logos, and the calculator tool itself, is the property of SolarCalc.fyi unless otherwise noted. You may not reproduce, distribute, or create derivative works without our written permission.

7. Third-Party Data

The Site uses data from the National Renewable Energy Laboratory (NREL) and other public sources. While we strive for accuracy, we are not responsible for errors or omissions in third-party data.

8. Limitation of Liability

SolarCalc.fyi, its operators, and affiliates shall not be liable for any direct, indirect, incidental, consequential, or punitive damages arising from your use of the Site or reliance on any information provided. This includes, but is not limited to, equipment damage, property loss, personal injury, or financial loss.

9. External Links

The Site may contain links to external websites. We are not responsible for the content or practices of any third-party sites.

10. Changes to Terms

We reserve the right to modify these terms at any time. Changes will be posted on this page with an updated date. Continued use of the Site after changes constitutes acceptance of the new terms.

11. Governing Law

These terms shall be governed by and construed in accordance with the laws of the State of Delaware, United States, without regard to its conflict of law provisions.

12. Contact

Questions about these Terms? Contact us at admin@solarcalc.fyi.