What is the best azimuth angle for solar panels?

For most fixed solar panels, the best azimuth is true south in the northern hemisphere and true north in the southern hemisphere. East and west facing arrays can still work well but usually produce less annual energy.

How much energy is lost if solar panels face east or west?

East or west facing panels often lose roughly 10 to 25 percent compared with the ideal direction, depending on tilt, latitude, weather, shading and electricity usage pattern.

Is azimuth the same as tilt angle?

No. Azimuth is the compass direction of the panel, while tilt is the vertical angle of the panel from horizontal.

Solar Panel Azimuth Angle Calculator | Orientation Loss

Solar Panel Azimuth / Orientation Loss Calculator

Estimate best solar panel direction, azimuth loss, annual kWh impact and roof orientation comparison for fixed solar PV systems.

☀️ Design Rule: In the northern hemisphere, fixed solar panels usually perform best facing true south. In the southern hemisphere, they usually perform best facing true north. Use this with the Solar Tilt Angle Calculator, Off-Grid Solar System Calculator, and Solar Panel Output Calculator.

🧭 Azimuth direction: compass direction of the solar panel face

Hemisphere

Panel Azimuth

Panel Tilt

System Size

Peak Sun Hours

System Losses

Azimuth convention: 0° = North, 90° = East, 180° = South, 270° = West. This is a quick annual estimate, not a shade simulation.

Presets:

Hemisphere

Latitude Optional

Usage Preference

Use this tab to find the practical solar direction for a new layout, roof choice, or installer discussion.

Common:

Hemisphere

Tilt

Roof A Azimuth

Roof B Azimuth

Roof C Azimuth

Roof D Azimuth

Compare multiple roof planes quickly. The best score is closest to the ideal azimuth, adjusted for tilt.

Presets:

📐 Formula Reference

Azimuth Difference

ΔAz = min(|Az - Ideal|, 360 - |Az - Ideal|)

Ideal Direction

North hemisphere ≈ 180° South
South hemisphere ≈ 0° North

Annual Energy

kWh/year ≈ kW × PSH × 365 × derate × orientation factor

Orientation Loss

Loss increases with azimuth error and panel tilt

📋 Quick Reference

Compass Azimuth

North0° / 360°

East90°

South180°

West270°

Direction Guide

Best annual north hemisphereSouth

Morning boostEast

Evening boostWest

Loss Guide

Very good0–5%

Acceptable5–15%

Review layout>20%

📚 Solar Orientation Notes

Azimuth is compass directionPanel azimuth is where the panel face points, not the sun position at one moment.

East-west can still be usefulEast panels produce more morning energy. West panels produce more afternoon/evening energy.

Flat roofs are less sensitiveWhen tilt is very low, orientation has less effect because the panel receives light from a wider sky angle.

Shading can dominateA slightly non-ideal unshaded direction may be better than a perfect south-facing shaded roof.

What is a solar panel azimuth angle calculator?

A solar panel azimuth angle calculator estimates how much energy may be lost when solar panels face away from the ideal compass direction. It helps compare south, east, west, north and split roof layouts.

Best direction for solar panels

For fixed panels, the usual best annual direction is true south in the northern hemisphere and true north in the southern hemisphere. A different direction can be chosen intentionally when morning or afternoon production is more useful.

Solar panel orientation loss

Orientation loss depends on azimuth error, panel tilt, latitude, season, shading and local weather. This calculator gives a practical planning estimate; final projects should be checked with site-specific solar design software and shading analysis.

❓ Frequently Asked Questions

Azimuth angle is the compass direction the solar panel faces. In this tool, 0° is north, 90° is east, 180° is south and 270° is west.

For maximum annual energy, fixed panels usually face true south in the northern hemisphere and true north in the southern hemisphere.

Yes, east-facing panels can be useful when morning energy is valuable or when the south roof is shaded or unavailable. Annual output is usually lower than ideal south-facing panels.

West-facing panels produce more afternoon energy, which can be useful for homes with evening loads or time-of-use electricity pricing.

For annual energy they are often similar if the angle from south is the same. South-west is better for afternoon production, while south-east is better for morning production.

Yes. Higher tilt generally makes azimuth direction more important. Low-tilt flat roof systems are less sensitive to compass direction.

Solar design normally uses true south or true north, not magnetic compass direction. Compass readings may need local declination correction.

Yes. East-west split arrays can broaden generation across the day and may allow more panels on limited roof space, though annual output per panel may be lower than the ideal direction.