City, state, or ZIP code (used to fetch solar irradiance, local incentives and utility rules)
Average current monthly electric bill (user can provide estimate in their local currency; currency selection is set globally)
Total annual household electricity consumption in kilowatt-hours (kWh). If unknown, the tool can estimate from monthly bill or utility bills.
Approximate conditioned floor area of the home in square feet (helps sanity-check energy usage & roof area requirements).
Available usable roof area for PV modules in square feet. If multiple roof facets, provide total usable area.
Primary roof orientation/facing direction. Impacts production estimates based on solar exposure.
Typical shading level across the proposed array area from trees, chimneys, or adjacent buildings.
System connection preference: grid-tied systems rely on the grid, off-grid requires full battery backup, hybrid mixes both.