SolarCalcKit is engineered and maintained by Raxa Technology as a free, transparent, and 100% client-side solar engineering platform. We build deterministic modeling tools for solar installers, electrical contractors, off-grid engineers, and clean energy enthusiasts worldwide.

Every calculator on this site runs entirely in your browser. No inputs, results, or personal data are ever transmitted to a server — there are no analytics scripts and no tracking cookies. The sizing formulas follow internationally recognized references such as IEEE 485 and the NEC, and every assumption used by an engine is documented on its page.

Our goal is simple: engineering-grade answers with nothing hidden. If you find an issue or want to suggest an improvement, we would like to hear from you.