Where you point solar panels decides how much power they make. The three levers of placement are orientation (which compass direction, or exposure, the roof faces), tilt (the roof’s pitch), and shading (what blocks the sun). This page focuses on the placement decisions that are usually fixed by your roof: the best direction to face, which roof plane to use, shading, and where on the roof the panels sit. Tilt angle is a separate lever with its own trade-offs, and we cover it in depth in our guide to optimizing solar panel angles.
Small placement choices add up. A south roof and a north roof on the same house can differ by tens of percent in yearly output, and a single tree shadow can cost far more than a few degrees of tilt. Below is a real, side-by-side comparison we ran so you can see the numbers, not just the rules of thumb.
Key takeaways
- In the U.S. (Northern Hemisphere), the best direction is a true-south roof face, which captures the most annual sunlight.
- East- and west-facing roofs are still worth it, at roughly 80% of a south roof’s output.
- North-facing roofs are the weakest option, near 60% of optimal in our model run.
- Shading is the largest avoidable placement loss because panels are wired in series.
- Orientation is usually fixed by your roof; tilt angle has more room to adjust.
The best direction for solar panels starts with orientation
Orientation, also called azimuth, is the compass direction a solar panel faces. In the Northern Hemisphere the sun tracks across the southern sky, so a surface aimed at true south collects the most sunlight over a full year. This is hemisphere-specific: south is the best direction across the United States, while the Southern Hemisphere favors true north (U.S. Department of Energy, as of 2026).
One detail trips people up. True south is not the same as the south your compass shows (magnetic south). The gap between them, called magnetic declination, can be several degrees depending on where you live, and a good installer accounts for it when they lay out your array. For a rough check, solar-noon shadows point true north-south wherever you are.
Production by roof orientation: a MySolarFY PVWatts comparison
To show how much orientation matters, we modeled the same 6 kW rooftop system in Baltimore, Maryland (latitude 39.3 degrees N), holding tilt fixed at 25 degrees and changing only the compass direction. The output comes from NREL’s PVWatts v8 model, and the last column is each direction’s share of the south-facing result. According to MySolarFY’s analysis (as of August 2026), a true-south 6 kW array in Baltimore produces about 8,491 kWh a year, versus 5,104 kWh for the same array facing north, a 40% swing driven by orientation alone.
MySolarFY estimate, as of August 2026 (see our data and methodology). Source: NREL PVWatts v8, standard 6 kW fixed roof-mount array, 25 degree tilt, 14% system losses, Baltimore MD. Illustrative, not a quote. Your roof, latitude, and shading will shift the exact numbers.
| Roof orientation (azimuth) | Annual output, 6 kW system | Share of south-facing optimum |
|---|---|---|
| South (180 degrees) | 8,491 kWh | 100% |
| Southeast (135 degrees) | 8,071 kWh | 95% |
| Southwest (225 degrees) | 8,011 kWh | 94% |
| East (90 degrees) | 6,994 kWh | 82% |
| West (270 degrees) | 6,904 kWh | 81% |
| North (0 degrees) | 5,104 kWh | 60% |
The pattern is clear and it matches the physics. South wins, southeast and southwest give up only a few percent, east and west cost about a fifth of the output, and north is the weakest by far. This is why placement usually starts by choosing the best available roof face rather than chasing a perfect tilt.
That gap is real money. The south-versus-north difference in the table is about 3,387 kWh a year. At a Maryland residential rate near 22 cents per kWh (EIA, as of mid-2026), that is roughly $737 a year in electricity a north roof would leave on the table, every year the system runs.
Which roof face and exposure should you use for solar panels?
Most homes have more than one roof plane, so the best placement often comes down to picking the right face and sun exposure. Using the comparison above as a guide:
- South-facing roof: the first choice. Maximum annual production and the best match for standard net metering.
- Southeast or southwest: nearly as good, within about 5 to 6% of true south. A west lean can even help if your utility charges more for late-afternoon power.
- East or west: viable, at roughly 80% of a south roof. East peaks in the morning, west in the afternoon. Many homes split panels across both.
- North-facing: the last resort in the U.S. Only worth it when no better plane exists, and often better replaced by a ground mount.
Roof pitch matters too, but it is a smaller effect than direction for most homes and it has its own trade-offs. We break tilt down separately in optimizing solar panel angles for maximum efficiency, including latitude-based angles and seasonal adjustment.
How shading affects solar panel placement
Shading is the single biggest avoidable loss in solar panel placement. A partially shaded panel does not just lose the shaded portion. Because cells in a panel, and panels in a string, are wired in series, a shadow on one part can drag down the whole string, an effect installers call the Christmas-light problem. Even a slim shadow from a vent pipe at the wrong time of day can cost far more output than its size suggests.
Common placement obstructions to plan around:
- Trees, especially ones that will grow taller over the system’s 25-plus year life
- Neighboring buildings and taller wings of your own house
- Roof-mounted obstructions: chimneys, vent stacks, satellite dishes, and dormers
- Seasonal shadows that only appear when the winter sun sits low
Good placement fights shading in three ways. First, choose the roof plane and area with the clearest southern exposure. Second, keep panels set back from obstructions so their shadows fall off the array. Third, use module-level electronics: microinverters or DC power optimizers let each panel produce independently, so one shaded panel no longer pulls the rest down (U.S. Department of Energy, as of 2026). A professional site survey uses sun-path modeling to map exactly where shadows fall across the year before anything is mounted.
Where on the roof do panels go? Best position and location
Once the roof face is chosen, placement gets more precise. The best location for panels is the clearest, largest continuous area of the best plane, with a few practical constraints:
| Placement factor | What to plan for |
|---|---|
| Fire-code setbacks | Most jurisdictions require clear pathways along ridges and edges for firefighter access. |
| Obstruction clearance | Leave space so chimney, vent, and dormer shadows fall off the array, not across it. |
| Usable continuous area | A few large unbroken zones beat many small scattered ones for wiring and output. |
| Structural support | An installer confirms the roof framing can carry the added load before layout. |
These rules are why the panel count that fits a roof is often smaller than the raw square footage suggests, and why two similar homes can support very different system sizes.
Creative placement when your roof is not ideal for solar
Plenty of homes do not have a clear south roof, and solar can still work. Some creative solar panel placement options put the array where the sun actually is, not just where the roof happens to face:
- Ground-mounted systems: the most flexible option. Because they are not tied to the roof, you can aim them true south at an ideal tilt and site them clear of shade.
- Solar carports and pergolas: use open, unshaded space over a driveway or patio.
- East-west split arrays: spread panels across two roof faces to gather morning and afternoon sun and spread production through the day.
- Community solar: where a roof truly will not work, some homeowners subscribe to a shared off-site array instead.
If your roof is the wrong shape or shaded but still south-leaning, solar tracking systems and module-level electronics can recover some of the loss, though a good fixed placement is usually the more cost-effective starting point.
How to map your own best placement
You can get a solid first read on your roof before you ever talk to an installer:
- Find your roof faces. Note which planes lean south, east, or west, and their rough pitch.
- Look for shade. Watch the roof through a sunny day, and picture the low winter sun and any trees at full height.
- Model the numbers. NREL’s free PVWatts calculator estimates annual output for your address, orientation, and tilt.
- Compare against the table above to see how much your best available face gives up versus true south.
- Confirm the rest. Panel quality also shapes output, so review solar panel specifications, and plan to monitor your production once the system is live.
A reputable installer then confirms the layout with sun-path modeling and a structural check, so your placement is optimized for your specific home.
One note on cost, since placement drives payback: the 30% federal residential clean energy credit (Section 25D) ended for homeowner-owned systems placed in service after December 31, 2025 (IRS, as of January 1, 2026), so a purchase in 2026 cannot claim it. State and utility incentives still vary widely by location, which is exactly what the eligibility check below looks up for your address.
See what solar programs are available in your ZIP code
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Frequently asked questions about the best direction for solar panels
What is the best direction for solar panels in the United States?
True south. Because the U.S. sits in the Northern Hemisphere, the sun spends the day in the southern sky, so a true-south surface gathers the most annual sunlight and gives panels the best exposure. True south differs from magnetic (compass) south by a few degrees, which an installer corrects for during layout.
Where should solar panels be placed for maximum output?
On the largest unshaded roof plane that faces as close to true south as possible, in the U.S. In our PVWatts comparison, a south-facing 6 kW array produced about 40% more per year than a north-facing one. If no south face exists, an east or west plane still returns roughly 80% of the optimum.
Do solar panels need to face the sun directly?
Not directly, and they cannot on a fixed roof since the sun moves all day. Fixed panels are aimed at the average best exposure, true south in the U.S., to capture the most sunlight over the year. Only tracking mounts follow the sun across the sky. For most homes a well-placed fixed array is the cost-effective choice.
How much output do east or west facing panels lose?
About 20%. In our Baltimore model run, east-facing panels made roughly 82% and west-facing roughly 81% of a south-facing array’s yearly output. That is usually still worth installing, and a west lean can pair well with utilities that price late-afternoon power higher.
Can solar panels work on a north-facing roof?
They work, but they are the weakest placement in the U.S. Our model showed a north-facing array at about 60% of the south-facing output. When a north face is the only roof option, a ground-mounted or carport array aimed south is often the better choice.
How much does shading reduce solar output?
More than its size suggests. Because panels are wired in series, a shadow on one panel can pull down the whole string. Microinverters or DC power optimizers limit that by letting each panel produce on its own, and a site survey maps year-round shadows before placement.
Is orientation or tilt angle more important for placement?
Orientation usually matters more and is harder to change, since it is set by your roof faces. Tilt has a smaller effect for most homes and more room to optimize. We cover the tilt side in detail in our guide to optimizing solar panel angles.
Further reading
New to solar? Start with how solar works for homeowners for the full picture of how placement fits into a home system.
EnergySage: the best direction and angle for solar panels
CNET: point your solar panels in the right direction for the most power
