About Solar Portal

Solar Portal exists to solve one problem: most people buying solar have no independent way to know what size system they actually need. Sellers routinely oversize or undersize systems, and the buyer pays for it for the next 25 years.

Our neutrality promise

We sell no panels, no inverters, no batteries and no installation services. We take no commissions and run no paid brand placements inside results. Every number this site produces comes from standard engineering formulas — nothing else influences it.

How the calculations work

The engine applies the same methods professional designers use: realistic performance ratios, local sun-hours by city or latitude, 30% inverter headroom with motor startup surge, depth-of-discharge and efficiency for batteries, and copper voltage-drop formulas for cabling. Results are design-grade estimates — final wiring must always be confirmed by a licensed installer.

Privacy

All calculations run in your browser. Your inputs are never uploaded or stored.