Privacy policy

Last updated: 2026-05-12.

What this site collects

Solar Payback Calculator is operated by Nathan Management (Andrew Flores), Baldwin Park, California. The site is a free utility supported by display advertising. The data the site itself collects is limited to:

• The ZIP code and system size you enter into the calculator, which are processed in your browser and used to look up state-level electricity rates and to fetch a production estimate from the NREL PVWatts API. These values are not stored on our servers.
• Standard web server access logs, including IP address, user agent, referrer, and requested URL, kept for routine security and operational monitoring. These logs are retained for no longer than 30 days and are not used for marketing.
• Anonymous traffic statistics from privacy-respecting analytics, if enabled.

Third-party services

The site uses the following third-party services. Each has its own privacy policy, linked below.

• NREL Developer Network (PVWatts v8 API). When you view a ZIP-level page, the server contacts NREL with the ZIP code and system parameters to return a production estimate. NREL's privacy practices are documented at nrel.gov/about/privacy.
• Google AdSense. AdSense serves the small number of display ads on this site and uses cookies and device identifiers to personalize and measure advertising. You can review and adjust your ad settings at adssettings.google.com and Google's privacy policy is at policies.google.com/privacy.
• Vercel hosting. The site is served from Vercel, which receives request metadata as part of normal operation. Vercel's privacy practices are at vercel.com/legal/privacy-policy.

Cookies

The site itself does not set first-party cookies for tracking. Google AdSense sets its own cookies subject to its terms. EU and UK visitors will see a consent prompt before AdSense personalizes ads.

Children

This site is not directed at children under 13 and we do not knowingly collect personal information from children under 13. If you believe a child has provided personal information, contact us and we will delete it.

California residents (CCPA / CPRA)

California residents have the right to know what personal information is collected about them, to request deletion, to correct inaccuracies, and to opt out of any "sale" or "sharing" of personal information. The site does not sell personal information. To exercise any of these rights, contact us through the contact page.

Contact

Privacy questions: hello@nathanmanagement.pro.