About Size My Generator

SizeMyGenerator is an independent homeowner planning resource for residential standby generator sizing. The website is operated by Sun Bear Running, LLC. William Christie, Founder of SizeMyGenerator, builds and maintains the site using his HVAC experience, generator-sizing coursework, and quantitative background. The calculator provides planning recommendations for homeowners. It is not an electrical design or installation approval.

William Christie

Founder of SizeMyGenerator

Christie operated his own HVAC business full-time from 1999 through 2008 and has continued working in HVAC part-time since then. He is EPA Section 608 Universal certified and has a Pennsylvania Home Improvement Contractor registration. He also completed Generac University’s Generator Sizing for Optional Standby Systems (RPZ105) in November 2025 and August 2026. That coursework is training, not a professional credential or manufacturer relationship. Christie earned a BBA from Temple University’s Fox School of Business in 2008, concentrating in actuarial science, and has worked in technical and mathematical roles since graduation.

Christie maintains SizeMyGenerator and is responsible for what it publishes. Technical claims are based on published standards, manufacturer documentation, public-authority safety guidance, and other authoritative sources as appropriate, with significant calculator changes tested before release. AI tools assist with research, writing, coding, and testing. See the Methodology and Editorial & Corrections Policy for more detail.

SizeMyGenerator is intended for residential optional standby systems. It is not for emergency, legally required standby, or critical operations power systems. It is independently operated and is not affiliated with, sponsored by, or endorsed by Generac or another generator manufacturer. Final equipment selection, transfer equipment, wiring, fuel supply, permits, manufacturer requirements, and local code compliance should be confirmed by the appropriate qualified professionals.

Corrections & updates

If you find a technical error, outdated source, calculator issue, unclear explanation, or other factual problem, email Bill@sizemygenerator.com. You may also write to: