About VoltCalcs

What This Site Does

VoltCalcs provides free, browser-based calculators for battery sizing, solar system design, and electrical engineering. Every calculator runs instantly in your browser with zero API calls, no account walls, and no paywalls.

The site serves DIYers, off-grid enthusiasts, RV owners, marine users, solar installers, and electricians who need quick, accurate answers to power and energy questions. Unlike general-purpose calculator farms that spread thin across thousands of topics, VoltCalcs goes deep on battery, solar, and electrical with real educational content.

Who Built This

Dan Dadovic — Developer & Off-Grid Energy Enthusiast

Dan holds a PhD in Information Sciences and two Master's degrees (Economics and Informatics) from the University of Zagreb. He works professionally as Commercial Director at Ezoic, leading revenue strategy across digital publishing. On the energy side, Dan has hands-on experience with residential solar panel installation, DIY battery bank construction, off-grid power systems, and wind power — all from building and maintaining his own systems.

Dan is not a licensed electrician or certified solar installer. The calculators on this site are practical estimation tools built from hands-on experience and standard electrical formulas — not professional engineering software. For critical electrical work, always consult a licensed electrician.

Independence

VoltCalcs is independently owned and operated. It is not affiliated with any battery manufacturer, solar company, or electrical equipment brand. Calculator results are unbiased — the site does not push any particular product or brand.

Get in Touch

Found a bug? Have a feature request? Want to suggest a new calculator? Send us feedback. Every message gets read.