What this website does
Balcony Solar Calculator provides free, browser-based tools for people evaluating small plug-in solar systems in the United States. The calculators turn common questions about system size, electricity rates, panel direction, housing type, state readiness, and battery storage into clear estimates and comparisons.
The goal is to make the tradeoffs easier to understand before someone buys equipment, speaks with a landlord or HOA, or checks requirements with a utility or local authority.
What you can explore
How to use the results
Calculator outputs are estimates based on the information entered and the assumptions explained on each page. Actual generation, savings, payback, and installation requirements can differ because of weather, shading, equipment, electricity prices, building conditions, utility rules, and changing laws.
Use the results as a starting point, then confirm important financial, legal, electrical, permitting, and installation questions with the relevant qualified professionals, utility, property owner, HOA, or public authority.
Last updated October 6, 2026.