Simple, honest solar calculators — no lead forms, no sales pressure.
SolarToolHub was built to answer one simple question that most solar websites make unnecessarily complicated: "how much solar equipment do I actually need?"
I'm Ahmad AbdelQader, an engineer from Jordan. I've worked in the solar energy field since 2018, on projects ranging from kilowatt-scale residential systems to megawatt-scale installations — grid-tied, off-grid, and hybrid alike. Through years of working directly with clients, one problem kept coming up: explaining the calculations and equipment behind a system, and why it was sized the way it was, was often harder than the engineering itself. Most people had no easy way to picture their own system before paying for a consultation. That's why I built SolarToolHub — a free, simple way for anyone to enter a few numbers and see a real picture of the system they're considering, instead of spending time and money on a consultation just to get a starting point. My hope is that it's genuinely useful to anyone trying to understand solar before committing to it.
Most solar calculators online are attached to a sales funnel — enter your details and a company calls you with a quote. SolarToolHub doesn't do that. Every tool here is free, doesn't require an account, and doesn't collect your contact information.
The formulas used across these calculators are based on standard industry engineering practices, cross-checked against real field experience from hands-on solar installation work. Where a number is a general estimate rather than an exact figure, the accompanying article explains the assumption clearly so you can adjust it for your own situation.
SolarToolHub currently offers a growing library of free calculators — covering panel sizing, inverter and battery sizing, cable sizing, charge controller selection, panel tilt, generator sizing, daily energy load, string sizing, energy production, and return on investment — alongside an off-grid system wizard and a set of practical field guides on installation, testing, maintenance, and troubleshooting. New tools and guides are published regularly. If there's a calculation you wish existed, get in touch on the contact page.