Solar Panel Orientation Calculator

How Solar Panel Orientation Affects Output

Orientation — the direction a panel faces — can materially affect production, along with tilt, latitude, season, weather, and shading. This calculator isolates orientation and tilt with fixed comparison factors so users can explore scenarios; it does not model a specific roofline, balcony, horizon, or hourly weather file.

The displayed percentages are calculator assumptions, not universal measured performance ratios. South is the 100% reference case in this model; southwest/southeast, east/west, northwest/northeast, and north use progressively lower fixed factors. Actual differences vary by location and installation.

South vs. East vs. West-Facing Solar Panels

East-facing panels tend to shift production earlier in the day, while west-facing panels tend to shift it later. Whether that timing increases bill savings depends on the household load profile and utility rate plan. A time-of-use plan can value electricity differently by hour, so compare the production window with the actual tariff rather than relying only on the model's annual percentage.

How Panel Tilt Affects Solar Output

Tilt changes the angle of incidence between sunlight and the panel. The best annual fixed tilt varies with latitude, orientation, climate, and site conditions. This calculator uses 30–35 degrees as its 100% reference and applies fixed factors at other angles; those factors are simplified scenario assumptions, not a site-specific production forecast.

A vertical railing installation can produce differently from a lower-tilt stand, but the size and seasonality of that difference vary. Use NREL PVWatts or a qualified site assessment when location-specific production matters.

What to Do If Your Balcony Faces North

A north-facing balcony is generally less favorable for direct-sun production in the continental United States, but actual results depend on the site. If another safe, permitted placement is available, compare it with a location-specific model. Community solar may also be an option in some utility territories; program availability, pricing, terms, and bill-credit treatment vary.

Methodology: Direction and tilt percentages are fixed calculator assumptions used for relative comparison. NREL PVWatts is an authoritative location-specific modeling resource, but it is not the source of these exact percentages. See Methodology & Sources.