South-facing roofs usually produce the highest annual solar yield in the UK.
But that does not mean every other direction is unsuitable.
A good solar design should consider much more than compass direction alone.
The overall result depends on:
- annual generation
- when that generation occurs
- roof pitch
- shading
- how many panels fit
- battery storage
- household electricity use
- future demand
- the cost of using additional roof faces
The best direction for one solar panel is not necessarily the best layout for the whole property.
And perhaps more importantly:
Solar design should optimise the roof you actually have, not the roof you wish you had.
Do Solar Panels Have to Face South?
No.
South-facing panels are normally the benchmark because they usually produce the highest annual yield in the UK.
But solar panels can also work well when facing:
- south-east
- south-west
- east
- west
- and, in the right circumstances, north
The best system is not always the one with every panel pointing in the theoretically best direction.
Roof size, shading, pitch and the number of panels that can actually be installed can all change the answer.
South is the benchmark for annual yield, not the minimum requirement for solar.
Solar Panel Direction at a Glance
| Direction | Typical Generation Pattern | Main Characteristic |
|---|---|---|
| South | Strongest around midday | Usually highest annual yield |
| South-East | Morning through midday | Very strong overall |
| South-West | Midday into afternoon | Very strong overall |
| East | Morning biased | Earlier generation |
| West | Afternoon/evening biased | Later generation |
| North-East / North-West | More site dependent | Lower yield, timing dependent |
| North | Highly pitch and location dependent | Needs proper assessment |
This is only a broad comparison.
Roof pitch, shading, postcode and the exact layout can significantly change the result.
Compare the Layout That Actually Fits the Property
One of the biggest mistakes when comparing solar directions is to imagine the same number of panels facing different ways.
That is often not the decision the homeowner actually has.
Imagine two possible layouts.
Example
Layout A — 10 south-facing panels.
Layout B — 10 south-facing panels plus 8 north-facing panels.
The useful question is not “Are the north-facing panels as good as the south-facing panels?” They probably will not be.
The useful question is “Does adding those eight panels improve the overall system enough to justify the additional cost?”
Now consider another property.
Layout A — 8 panels fit on the south roof.
Layout B — 16 panels fit across the east and west roofs.
The east and west panels may each generate less annually than an equivalent south-facing panel.
But there are twice as many of them.
The larger east-west system may therefore generate more electricity overall.
Compare the solar layouts that actually fit the property, not identical panels facing different directions.
Yield per Panel vs Yield per Roof
There are several ways to judge whether a roof face is useful.
- Yield per Panel
- How much electricity can each individual panel generate? South-facing panels usually have the advantage.
- Yield per Usable Roof
- How much electricity can the entire available roof area generate? This takes panel count into account. A larger east or west roof may produce more total electricity than a much smaller south roof.
- Yield per Installed £
- How much additional generation does a roof face provide for the extra money spent using it? This becomes particularly important when scaffolding, inverter equipment and electrical work are already part of the installation.
The most productive panel does not always create the most productive roof.
How Much Solar Is Generated vs When It Is Generated
Solar orientation affects two different things.
Annual yield is how many kWh of electricity the array generates over the year.
Generation profile is when during the day that electricity is produced.
These are related, but they are not the same.
A south-facing array may produce more electricity over the year.
An east-west array may spread generation over a longer part of the day.
Depending on how the household uses electricity, both can have advantages.
How much electricity the panels generate and when they generate it are two different questions.
South-Facing Solar Panels
South-facing solar is normally the annual-generation benchmark in the UK.
The sun spends most of its path across the southern part of the sky, so south-facing panels usually receive strong solar exposure throughout the year.
Typical characteristics include:
- high annual generation
- strong midday output
- relatively strong winter performance
- a more pronounced midday generation peak
If a property has a large, clear, unshaded south-facing roof, it will normally be one of the first roof areas considered.
But even here, direction is not the only factor.
A heavily shaded south roof may be less attractive than a clearer roof facing another direction.
South-facing panels usually maximise annual generation, but maximum annual generation is not always the same as maximum usefulness to the home.
East-Facing Solar Panels
East-facing panels move more of the generation towards the morning.
They typically begin producing strongly earlier in the day and reduce output sooner during the afternoon.
That can suit homes with higher morning electricity demand.
For example:
- breakfast and cooking
- morning appliances
- hot-water heating
- heat-pump operation
- people working from home
- other electrical loads running earlier in the day
East-facing solar shifts more of the generation curve towards the morning.
That may be valuable even if annual generation is somewhat lower than an equivalent south-facing array.
West-Facing Solar Panels
West-facing solar produces more strongly later in the day.
Morning generation is usually lower, but production continues further into the afternoon and evening.
That can overlap well with household demand such as:
- cooking
- appliances
- people returning home
- heat-pump demand
- air conditioning
- EV charging when the vehicle arrives home
West-facing solar may generate less annually than south while producing more electricity later in the day when the home may be using it.
Is East or West Better?
There is no universal winner.
The better orientation depends partly on when electricity is used.
East may suit:
- high morning demand
- people home early in the day
- morning hot-water or heating loads
West may suit:
- stronger afternoon demand
- evening cooking
- people arriving home later
- loads that continue into the evening
If the annual generation difference is relatively small, the household demand profile can become the more useful deciding factor.
An orientation becomes more useful when its generation profile overlaps with the home’s demand profile.
East + West Solar Panels
Using both east and west roof faces can create a broader generation curve.
The east array begins strongly in the morning.
The west array continues producing later in the day.
Together, that can create something closer to:
Morning → Midday → Afternoon → Early Evening
rather than one large midday peak.
An east-west system can therefore offer:
- a longer generation window
- a flatter production curve
- good direct self-consumption in some homes
- greater use of available roof space
It can also be particularly attractive where neither roof face is large enough to accommodate the desired system on its own.
The best generation curve for the home is not always the one with the highest midday peak.
Can Solar Panels Face North?
Yes.
But north-facing solar needs more careful assessment.
A north-facing roof should not automatically be rejected.
It should also not automatically be assumed to be worthwhile.
The result depends heavily on:
- roof pitch
- exact orientation
- location
- shading
- number of panels
- installation cost
- how the energy will be used
North-facing solar should be modelled, not automatically rejected.
Why Roof Pitch Matters So Much on North-Facing Solar
A shallow north-facing roof can behave very differently from a steep north-facing roof.
Imagine two roofs facing exactly north.
One has a shallow pitch.
The other is much steeper.
The steep roof points more directly away from the main solar path.
The shallow roof presents a less severe angle and can receive considerably more useful solar exposure, particularly during the brighter months of the year.
This is why direction cannot be considered on its own.
Direction tells you where the roof points. Pitch determines how strongly that direction affects performance.
Shallow North vs Steep North
- Shallow North-Facing Roof
- May still receive useful levels of high-summer sunlight, diffuse light and long-day generation. That can make it worth assessing, particularly when it forms part of a larger installation.
- Steep North-Facing Roof
- Points much more strongly away from the main solar path. That can significantly reduce annual generation and particularly affect winter performance.
Shallow north can be surprisingly productive. Steep north can be heavily penalised.
How Much Less Do North-Facing Solar Panels Produce?
There is no responsible single percentage that applies to every north-facing roof.
The result depends on:
- roof pitch
- exact compass direction
- postcode
- shading
- surrounding horizon
That is why statements such as:
“North-facing solar produces 55% of south-facing solar”
should only ever be treated as broad guidance unless the assumptions are known.
A shallow roof in one part of the country may perform very differently from a steep roof elsewhere.
Any north-facing percentage quoted without pitch and location is only a rough guide.
Solar Direction Changes Through the Seasons
- Summer
- The sun rises earlier, sets later and travels much higher through the sky. East, west and shallow non-south-facing roofs can perform comparatively well.
- Winter
- The sun remains much lower and spends more of its path through the southern sky. South-facing solar therefore tends to have a stronger advantage. This can be especially important for homes with electric heating.
An annual generation figure can hide large seasonal differences.
Annual yield can hide large seasonal differences between roof directions.
A Lower-Yield Roof Can Still Make Financial Sense
Solar design should not consider generation without also considering installation cost.
A project may already require:
- scaffolding
- inverter equipment
- consumer-unit work
- DNO application
- monitoring
- installation labour
Once those fixed project costs are already being incurred, adding panels to another usable roof face may cost much less than installing a completely separate solar system later.
That changes the economics.
A secondary east, west or north-facing roof does not necessarily need to match the yield of the best roof.
It needs to produce enough additional value to justify its additional cost.
A lower-yield roof can still be valuable when the cost of adding it to an installation already underway is relatively small.
Best Roof First vs Use More Roof
There are two perfectly valid strategies.
- Best Roof First
- Prioritise the strongest roof faces. This can make sense when budget is limited, maximum return per panel matters, inverter capacity is restricted, or access to other roofs would add significant cost.
- Use More Suitable Roof
- Install on additional usable roof areas where the marginal economics make sense. Attractive when scaffolding is already being provided, additional panels are relatively inexpensive, future electricity demand is expected to rise, or the additional generation has a clear use or export value.
Neither strategy is automatically correct.
The right decision depends on the property and the wider energy plan.
Should You Add North-Facing Panels While the Scaffolding Is Already Up?
This is where the economics can become very different.
Suppose the main installation already includes:
- south-facing solar
- inverter
- scaffolding
- electrical work
- commissioning
Adding another group of panels to a north-facing roof may involve some extra mounting equipment, panels, cabling and labour, but many of the project’s larger fixed costs already exist.
The decision should therefore compare additional cost against additional lifetime generation and value, not north output against south output.
The financial question is not whether north produces as much as south. It is whether the extra generation is worth the extra project cost.
The Best Orientation Depends on When You Use Electricity
- Morning-Heavy Home
- East-facing generation may overlap well with demand.
- Afternoon or Evening-Heavy Home
- West-facing generation may become more useful.
- Daytime Home
- South or a mixed orientation may work particularly well.
- Highly Electrified Home
- A property with an EV, heat pump, battery and electric hot water may have more opportunities to use generation from multiple roof faces.
Different homes have different demand profiles.
The most useful orientation therefore depends partly on what is happening inside the home.
Battery Storage Changes the Value of Solar Direction
Without battery storage, solar electricity usually has the greatest direct value when it is generated at the same time as household demand.
With a battery:
Solar → Battery → Home Later
becomes possible.
That means surplus midday generation from a south-facing array can be stored for later use.
A battery can therefore reduce some of the importance of perfectly matching solar generation to household demand.
But it does not make orientation irrelevant.
Direction can still affect:
- when the battery begins charging
- how quickly it fills
- winter charging
- how much electricity is exported
- how much battery capacity is needed
Battery storage reduces the need to use every solar kWh immediately, but it does not make orientation irrelevant.
Exported Solar Still Has Value
Solar electricity does not become worthless when it leaves the property.
Depending on the tariff, exported electricity may generate income.
That means the financial comparison is not simply use it or waste it.
It may be use solar directly versus store solar versus export solar.
The most valuable choice can change depending on:
- import electricity price
- export payment
- battery losses
- battery state of charge
- future demand
Exported electricity is not necessarily wasted electricity. Its value depends on the tariff.
EVs Can Make More Roof Space Useful
An EV can substantially increase household electricity consumption.
That can make additional solar generation more useful.
But timing still matters.
If the EV is at home during the daytime, solar may charge it directly.
If the vehicle is normally away during solar hours, additional generation may instead:
- charge a home battery
- be exported
- supply other household loads
A larger solar array can become much more useful after an EV is added.
Additional electrical demand can make roof space that looked marginal today much more useful tomorrow.
Heat Pumps Change the Seasonal Question
A heat pump can significantly increase winter electricity demand.
That means annual solar generation is not the only figure worth considering.
A roof orientation that produces strongly in summer but comparatively poorly in winter may contribute less towards heating demand than its annual kWh figure initially suggests.
This is particularly relevant when considering additional north-facing solar.
South-facing generation generally has a stronger winter advantage because of the low winter sun.
For a highly electrified home, when the solar is generated can matter almost as much as how much is generated.
Do Not Judge Tomorrow's Solar Against Today's Electricity Bill
A solar system can operate for decades.
Household electricity demand may change substantially during that time.
Future additions might include:
- EV
- second EV
- heat pump
- battery storage
- electric hot water
- air conditioning
A roof face that appears unnecessary today may become much more useful after the home becomes more electrified.
That does not mean every roof should automatically be filled with panels.
It means future demand should be part of the decision.
Do not judge tomorrow’s solar layout only against today’s electricity demand.
Shading Can Matter More Than Direction
Orientation is important.
Shading can be even more important.
A south-facing roof may look perfect on a compass but suffer significant shading from:
- trees
- chimneys
- dormers
- nearby buildings
Meanwhile, an east or west roof may be completely clear.
In that situation, the nominally weaker orientation may be more useful in practice.
A clear east- or west-facing roof can be more useful than a heavily shaded south-facing one.
Roof Geometry Can Matter More Than Compass Direction
Available roof area matters.
Imagine:
Example
South roof — only four panels fit because of a dormer, roof windows, a chimney and a complex roof shape.
West roof — ten panels fit on a large uninterrupted roof.
The west-facing panels may each generate less annually. But the west roof may generate more electricity overall because it accommodates far more solar capacity.
Orientation affects each panel. Roof geometry determines how many panels you actually have.
Optimisers Do Not Fix Poor Solar Exposure
Optimisers can be useful.
They may help with:
- module mismatch
- certain shading conditions
- module-level monitoring
But they cannot create sunlight.
Installing an optimiser on a poorly exposed panel does not make that roof face equivalent to a better orientation.
Optimisers can manage mismatch. They cannot turn a poorly exposed roof into a high-yield one.
Multiple Roof Directions Need Proper Electrical Design
Using several roof directions is completely normal.
A solar system might include south, east, west and north, or several combinations of those directions.
But panels facing different ways experience different generation conditions.
The electrical design may therefore need to consider:
- separate strings
- separate MPPT inputs
- inverter voltage and current limits
- microinverters
- optimisers where appropriate
Homeowners do not need to design this themselves.
But the installer should be able to explain how different roof faces are being managed.
Using several roof directions is completely normal, but the electrical design needs to recognise that those arrays behave differently.
South vs East-West Solar on a Flat Roof
Flat roofs create a slightly different design problem.
Panels can often be mounted at an angle rather than following the roof itself.
Two common approaches are:
- South-Tilted Rows
- Strong per-panel annual yield and traditional orientation towards the strongest solar exposure. But rows may require spacing to reduce self-shading.
- East-West Rows
- More panels may fit into the available area, generation can be spread across a broader part of the day, and lower tilt angles can reduce the spacing required between rows.
The right flat-roof layout depends on wind loading, ballast, access, shading, panel density and how the electricity will be used.
On a flat roof, the best layout may be the one that balances panel count, annual yield and generation timing.
How Batteries Change the Direction Decision
Without a battery, generation that overlaps with household demand can be especially useful. East- and west-facing panels may therefore improve direct self-consumption in some homes.
With a battery, midday surplus can be stored and used later. That can make total annual generation more important again, although battery size, charging power and export still matter.
A battery does not make orientation irrelevant. It changes the value of when the electricity is generated.
How EVs and Heat Pumps Change the Answer
Homes planning an EV, heat pump, electric hot water or cooling may have much higher future electricity demand than they do today.
That can make additional roof faces more useful, even where those panels produce less per panel than the best-facing roof.
Do not judge tomorrow’s solar array only against today’s electricity demand.
How to Compare Solar Direction Proposals
Ask each installer to show:
- panel count on each roof face
- array capacity in kWp
- roof pitch and orientation assumptions
- shading assumptions
- annual and monthly generation estimates
- generation profile where available
- inverter and MPPT arrangement
- expected self-consumption and export assumptions
- marginal cost of adding secondary roof faces
- any constraints created for future expansion
Compare complete layouts, not isolated orientation percentages.
Common Solar Direction Questions
Is south always best for solar panels?
South usually gives the strongest annual yield per equivalent panel in the UK, but another layout may use more roof area or produce energy at more useful times.
Are east- and west-facing panels worthwhile?
They can be. East shifts generation earlier and west shifts it later. A combined east-west array can create a broader generation window.
Are north-facing panels worth considering?
Sometimes. Shallow pitch, location, shading, panel count and the marginal installation cost all affect the answer. North-facing solar should be modelled rather than automatically rejected.
Does shading matter more than direction?
It can. A clear east- or west-facing roof may be more productive than a heavily shaded south-facing roof.
Can panels face several directions on one system?
Yes. Multiple orientations are common, but the electrical design must manage their different generation conditions correctly.
The Best Direction Is a Whole-Roof Decision
South remains the annual-yield benchmark. East and west can broaden the generation day. North can be viable where pitch, location and cost support it.
The best design is the one that uses the property’s suitable roof space intelligently and produces electricity that the home can use, store or export effectively.