North-facing panels produce the most energy over a year, but east-west layouts spread generation across the morning and afternoon. Compare production shape, usage patterns, roof constraints and split-array design. If you have the choice, north-facing panels produce the most electricity over a year in Sydney. But the best layout for your home is not always the one with the highest annual total. East and west-facing panels produce less overall, yet they spread generation across the morning and late afternoon, when many households actually use power. The right answer depends on your roof, your daily routine, your tariff and whether a battery is part of the plan.
How orientation shapes your solar day
Each orientation traces a different production curve:
- North-facing panels produce a tall, symmetrical curve peaking around the middle of the day, with the highest annual yield and the best winter output.
- East-facing panels start earlier, peak mid-morning and tail off after lunch.
- West-facing panels start slowly, peak in the afternoon and keep producing later, which lines up with afternoon air-conditioning and early evening cooking.
- An east-west split combines both into a lower, broader curve that is flatter at midday.
As a rule of thumb, east or west-facing panels typically produce roughly 15-20% less over a year than the same panels facing true north at a similar pitch. On low-pitched roofs the gap tends to narrow, because a flatter panel is less sensitive to direction. On steep roofs it tends to widen.
Side-by-side comparison
| Factor | North-facing | East-west split |
|---|---|---|
| Annual energy per kW of panels | Highest | Typically lower |
| Midday peak | Tall, more likely to reach export limits | Lower and broader |
| Morning and late afternoon output | Moderate | Stronger |
| Winter output | Best | Weaker, especially on steep roofs |
| Inverter inputs needed | One MPPT input can be enough | Separate MPPT inputs for each direction |
| Best suited to | Homes using or storing power at midday | Homes using power in the morning and afternoon |
Matching the layout to how you use power
Feed-in tariffs in NSW are commonly only a few cents per kWh, while grid electricity commonly costs 30-45 c/kWh, so most of the value of solar lies in the energy you use yourself. That makes timing important. Think through a typical weekday:
- Morning. Showers with electric hot water, breakfast and winter heating. East-facing panels help here.
- Middle of the day. In an empty house, midday generation is mostly exported. If someone works from home or a pool pump runs, north-facing output is well used.
- Afternoon. Air-conditioning on hot days, children home from school, early cooking. West-facing panels line up well.
- Evening. No panel direction helps after sunset. Only a battery moves solar into the evening.
On a time-of-use plan with a peak that starts in the afternoon, west-facing generation can offset some of the most expensive energy you buy. A battery changes the calculation again: it needs a solid daytime surplus to fill, which favours north-facing capacity, although an east-west array with enough panels can also do the job. Sizing to your usage is covered in the system sizing guide.
When the roof decides for you
Many Sydney homes have a hip roof or a ridge running north-south, so the largest faces point east and west. Others have a north face that is small, shaded or broken up by skylights and vents. Then the real question is not north versus east-west, but whether to use the east and west faces at all, and usually the answer is yes. Because panels are a modest part of total system cost, adding a little extra capacity to an east-west layout can recover much of the annual shortfall, within inverter sizing, export limits and STC oversizing rules.
Roof factors that affect the decision:
- Pitch. Flatter roofs lose less by facing east or west. Tilt frames can angle panels on a flat roof, but a flush east-west layout is often simpler and handles wind better.
- Shade. An unshaded west face can outperform a north face shaded by a neighbour's tree for half the year.
- South faces. South-facing panels in Sydney produce materially less and are rarely recommended except on very low pitches.
- Space. Higher-wattage panels fit more capacity on a small north face before spilling onto other faces, as the panel efficiency guide explains.
Designing a split array properly
When panels face more than one direction, the electrical design matters. Panels facing different directions should normally sit on separate strings connected to separate MPPT inputs, so each group operates at its own best point. Check that the quote shows:
- An inverter with enough MPPT inputs for the number of orientations used.
- Which panels are on which string, and the direction each string faces.
- A yield estimate that models each roof face separately rather than treating the whole array as north-facing.
- Enough panels on each face for the string to reach the inverter's operating voltage.
On roofs with three or more usable faces or complex shading, some designs use module-level electronics instead. That can be worthwhile, but it adds cost and more components on the roof, so ask the designer why it is needed. If you would like an independent look at your roof before choosing, the market on this site lists a Solar-Ready Roof Assessment at $199 (indicative), covering roof condition, pitch, shading and layout.
When two quotes propose different layouts
It is common for one installer to put every panel on the north face and another to spread them across east and west. Neither is automatically wrong. To compare them fairly, ask both installers for the same information:
- Total system size in kW and the number of panels on each roof face.
- Estimated annual generation, and ideally a typical summer and winter day, for each layout.
- How much midday generation is likely to be curtailed by your export limit.
- How the layout suits your usage pattern, a future battery or an EV.
- Whether any panels are affected by shade in winter.
A layout that produces slightly less in total but more when you are home, with less curtailment, can be the better buy. A quote that cannot explain its layout in these terms is harder to trust, whichever roof face it uses.
Next steps
Ask each installer to show expected production by roof face and to explain why their layout suits your usage. For a layout based on an in-home inspection of your roof, you can request a free assessment from Blue Energy Solar, and see related roof and design services in the market.
Frequently asked questions
Is a west-facing solar system worth installing on its own?
Often, yes. A west-facing array produces less over a year than a north-facing one, but more in the late afternoon, which suits households that run air-conditioning or cook early in the evening and those on time-of-use plans with an afternoon peak. The value depends on shading, pitch and your usage, so ask for a yield estimate modelled on that actual roof face.
Can east and west panels share one inverter?
Yes. One inverter can serve both faces, provided it has separate MPPT inputs so each direction runs on its own string, and most modern residential inverters have at least two. The quote should state which panels connect to which input. Mixing orientations on a single string usually costs output, because the string tends to operate at the level of its weakest panels.
Can tilt frames turn east or west-facing panels towards north?
On a flat or very low-pitched roof, tilt frames can angle panels towards north. On a pitched east or west roof, turning panels to face north usually means tall frames that catch the wind, need engineering and look prominent from the street. In many cases, adding a little extra panel capacity flush on the existing faces is simpler and more cost-effective.
Please Login or Sign up to be able to comment