About the Author

GainTally is built and operated by Ender Yalçınkaya, an independent software engineer and the founder of GainTally.

Every calculator on this platform exists because of a single conviction: clean energy tools should educate, not sell. The dominant business model in residential solar comparison sites is lead generation — visitor data turned into sales records. GainTally rejects that pattern entirely.

There are no installer kickbacks, no affiliate referrals tied to calculator outputs, no investor pressure to optimize for conversions. The tools give the same answer whether your decision is to install solar this year or to wait five years.

For more on the no-lead-gen philosophy, see the About page. Every formula and assumption behind each calculator is documented on the Methodology page.