What Is Azimuth?
Measured in degrees clockwise from true north, azimuth is the compass direction a solar panel faces. In the northern hemisphere a due-south azimuth collects the most sunlight over a year, while east and west azimuths still produce well but shift the output toward morning or afternoon.
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Measured in degrees clockwise from true north, azimuth is the compass direction a solar panel faces. In the northern hemisphere a due-south azimuth collects the most sunlight over a year, while east and west azimuths still produce well but shift the output toward morning or afternoon.
Azimuth explained
Think of azimuth as the compass heading of the roof face the panels sit on. North is the starting point, east is a quarter turn clockwise, south is halfway around, and west is three quarters of the way. Azimuth works together with tilt to define a panel’s orientation, and both feed the production model. Roofs that face south collect the most over a full year. Roofs facing east or west give up some annual output but keep producing, often at hours that suit a household’s usage.
Homeowners rarely know their roof azimuth, so the question gets asked in plain language: which way does the back of the house face, or where is the sun on the roof in the afternoon? Satellite imagery settles it before anyone visits. Many homes have several roof planes at different azimuths, and the design splits panels among them. West-facing production can pay off where electricity is most expensive in the late afternoon and evening.
Two things trip people up. A phone compass reads magnetic north, while design software works from true north, and the gap between them changes by location, so hand readings can disagree with the plan set. And south is not always the answer: a design that favors a rate schedule or a battery can prefer a different direction. Writing off a roof for facing east or west is a common, avoidable loss.
Why it matters when you're buying
Roof direction is one of the fastest ways to qualify a home by phone. Ask which way the back of the house faces, note it, and never call a roof dead for facing east or west. If direction is a hard stop for your installs, add it to the criteria you set with VA Horizon at kickoff, so it is checked before an exclusive, double-confirmed appointment reaches your calendar.
Frequently Asked Questions
What is the best azimuth for solar panels?
How can I tell which direction my roof faces?
Can solar panels work on a north-facing roof?
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