When planning a solar installation, one of the first questions homeowners ask is: which direction should the solar panels face?
In Australia, north-facing panels generally receive the most sunlight across the day. However, the best roof orientation for solar panels in the Blue Mountains is not always as straightforward as choosing the northern side of the roof.
Tall trees, surrounding ridgelines, steep roof pitches, valleys and reduced winter sunlight can all influence where panels should be installed. Your household’s electricity usage also matters. In some cases, an east-facing, west-facing or split solar array may provide a better practical result than placing every panel on a north-facing roof.
Is North the Best Direction for Solar Panels?
For most Australian homes, a north-facing roof is considered the preferred starting point for solar panels. It generally receives consistent sunlight from late morning through the middle of the day, supporting strong overall solar production.
However, north-facing panels are not automatically the best option for every Blue Mountains property.
A north-facing roof may be heavily shaded by tall trees, neighbouring buildings or elevated land. Another section of the roof may receive more usable sunlight, despite facing a different direction.
A professional site assessment considers the actual solar access available rather than relying on roof direction alone.
Can Solar Panels Face East or West?
Yes. East- and west-facing solar panels can both perform well, particularly when the direction of the panels matches the times your household uses the most electricity.
East-Facing Solar Panels
East-facing panels begin generating electricity earlier in the day. They can be a practical option for households that use more power during the morning for heating or cooling, preparing breakfast, heating water, working from home or running appliances such as washing machines.
West-Facing Solar Panels
West-facing panels continue generating electricity later into the afternoon. This can benefit households with higher energy use after school or work, when air conditioning, cooking appliances, pool pumps and electric vehicle chargers may be operating.
Although west-facing panels may produce less total energy than an unshaded north-facing system, they can generate more electricity when the household is most likely to use it. This may help reduce the amount of electricity purchased from the grid during the late afternoon.
The Australian Government’s Solar Consumer Guide explains that panels can be installed across different roof orientations, depending on available sunlight and when electricity is used.
Would a Split Solar Array Work Better?
Many Blue Mountains homes have several usable roof sections facing different directions. Dividing panels between north-, east- and west-facing roof areas can spread solar production across more of the day.
For example, east-facing panels can begin producing in the morning, while west-facing panels extend generation into the afternoon.
A split array may be helpful when:
The main north-facing roof is partially shaded
Electricity use is high in the morning and afternoon
There is not enough space on one roof section
The roof has several pitches or levels
Trees affect different areas at different times
The household wants a longer daily solar-generation window
The right layout depends on the available roof space, shade patterns, inverter configuration and household energy profile.
How Blue Mountains Conditions Affect Solar Orientation
Solar design in the Blue Mountains requires a detailed understanding of local conditions. Two homes in the same suburb can have very different solar potential because of their elevation, surrounding vegetation and roof design.
Tall trees and seasonal shade
Established trees are one of the most important considerations for local solar installations. Gum trees and other tall vegetation can cast moving shadows across a roof throughout the day.
The effect may also change considerably between summer and winter. When the sun sits lower in the sky during winter, shadows become longer and roof areas that receive good summer sunlight may experience significant winter shading.
A solar assessment should consider current shade as well as trees that may continue growing during the life of the system.
Valleys and surrounding ridgelines
Homes positioned below ridgelines or within valleys may lose direct sunlight earlier in the afternoon or receive it later in the morning.
This can change the value of different roof orientations. For example, west-facing panels may be less beneficial if a nearby ridge blocks the late-afternoon sun.
Roof pitch
Roof pitch affects the angle at which sunlight reaches the panels. Most panels on a pitched roof are installed parallel to the roof surface, provided the pitch and orientation are suitable.
Tilt frames may be considered for some flat or low-pitched roofs, but they can increase installation costs and require additional spacing to prevent one row of panels shading another.
Fog, cloud and winter conditions
Solar panels still generate electricity during cloudy conditions, although output will be lower than on a clear day. In higher Blue Mountains locations, fog, cloud cover and shorter winter days should be considered when estimating expected system performance.
This does not mean solar is unsuitable. It means the system needs to be designed around the property’s real conditions rather than using a standard layout.
Is Shade More Important Than Roof Direction?
In many cases, yes.
An unshaded east- or west-facing roof may outperform a north-facing roof affected by significant shade. Even partial shading can reduce production, particularly when the system design does not adequately account for the way shadows move across individual panels.
The effect of shade can be managed through careful panel placement and suitable system technology. Depending on the property, the design may use multiple roof sections or panel-level optimisation to reduce the impact of uneven conditions.
This is why an on-site assessment is especially important in the Blue Mountains. Satellite images can provide useful preliminary information, but they may not accurately show tree height, changing shadows, roof condition or nearby terrain.
Should Panels Be Positioned for Maximum Generation or Energy Use?
The system should be designed to deliver the best practical result for the household.
Maximum total generation is important, but it is not the only consideration. Solar electricity is generally most valuable when it is used in the home as it is generated.
If a household uses substantial electricity during the late afternoon, placing some panels on a western roof may help reduce grid electricity use during that period. A household with strong morning demand may benefit from east-facing panels.
Before recommending a layout, a solar installer should review:
When the household uses electricity
Current electricity bills
Available unshaded roof space
Roof direction and pitch
Morning and afternoon shade
Seasonal changes
Plans for a solar battery
Future electric vehicle charging
Expected changes to household energy use
Avery Solar & Electrical designs residential solar panel systems around the property and household rather than applying the same panel layout to every home.
What If the Roof Is Not Ideal?
A roof does not need to face perfectly north to make solar worthwhile.
A well-designed system may use:
East- and west-facing roof sections
Panels across several roof orientations
Higher-efficiency panels where space is limited
Microinverters or panel-level optimisation where appropriate
Strategic panel placement to avoid shaded areas
A system size that accounts for local generation conditions
The important question is not simply, “Which way does the roof face?” It is, “Which roof areas receive the most useful sunlight throughout the year?”
You can view Avery’s solar and energy solutions or explore completed solar case studies to see how systems can be designed for different properties and energy requirements.
Arrange a Solar Assessment for Your Blue Mountains Home
The best solar panel orientation depends on your roof, surrounding trees, local terrain and the times when your household uses electricity.
Avery Solar & Electrical provides personalised solar system design and installation throughout the Blue Mountains, Penrith and Hawkesbury. Our team conducts an on-site assessment to examine the available roof space, potential shading and household energy needs before recommending a system.
Contact Avery Solar & Electrical on 02 4720 6300 to arrange a free solar assessment and find the most effective panel layout for your home.
FAQ
North-facing roofs generally receive the most sunlight throughout the day. However, the best orientation depends on shading, surrounding trees, roof pitch, nearby ridgelines and when the household uses electricity.
No. East- and west-facing solar panels can still provide strong results. East-facing panels generate earlier in the morning, while west-facing panels continue producing later in the afternoon.
West-facing panels can be worthwhile for households that use more electricity during the afternoon. They may help reduce grid electricity use when people return home from work or school.
Tall trees can cast moving shadows across a roof and reduce solar production. The impact may become more noticeable in winter when the sun is lower and shadows are longer.
Yes. Panels can be divided between different roof sections to make better use of available sunlight and spread electricity generation across the day.
Yes. Solar panels continue generating electricity in cloudy or foggy conditions, although production is lower than during clear, sunny weather.
Is Your Roof Suitable for Solar?
Avery Solar & Electrical will assess your roof orientation, shade and energy use to design a solar system suited to your Blue Mountains home.
Arrange a Free Solar Assessment
