South-Facing vs East-Facing Roofs: Which Is Better for Solar?
South-facing roofs are better for solar panels. They capture the most direct sunlight all day. But east-facing roofs still work well, especially for morning energy use. The right choice depends on your roof, your household, and when you use power.
Quick Answer
- South-facing: Best output overall, up to 100% efficiency
- East-facing: Around 80-85% of south-facing output, strong morning generation
- Best pick: Depends on your energy habits, not just roof direction
How Much Less Energy Do East-Facing Panels Produce?
East-facing solar panels typically generate around 80% to 85% of the output of a south-facing array. That’s a modest drop, not a dealbreaker.
Some studies suggest an even bigger gap. Research from the University of York examined 26 Yorkshire-based solar arrays and found south-facing systems came out on top, though east- and west-facing arrays still performed well.
Either way, an east-facing roof isn’t a reason to skip solar altogether.
Why Does South-Facing Win?
South-facing roofs face the sun for the longest stretch of the day. The panels sit in direct light from morning through afternoon.
In the UK, solar panels produce full irradiance when oriented due south at a 35-degree incline. That’s the benchmark installers measure everything else against.
East-facing panels only catch the sun from sunrise to solar noon. After that, output tails off as the sun swings south and west.
When Does an East-Facing Roof Make More Sense?
East-facing roofs aren’t a compromise. They’re a smart choice for the right household.
East-facing panels suit you if you:
- Use most of your electricity in the morning
- Run a kettle, shower, or washing machine before work
- Have an east-facing roof and no other viable option
- Want to pair panels with a battery to store morning surplus
East-facing installations weren’t always viable, but improvements in panel technology have changed that over the past decade. Modern monocrystalline panels make east-facing systems genuinely profitable.
South vs East-Facing: Quick Comparison
| Factor | South-Facing | East-Facing |
| Peak output | Up to 100% | 80-85% of south |
| Best generation time | Late morning to afternoon | Sunrise to solar noon |
| Ideal for | All-day energy use | Morning-heavy households |
| Payback period | Fastest | Slightly longer |
| Battery pairing benefit | Moderate | High |
Does Roof Angle Matter Too?
Yes. Direction isn’t the only factor. Pitch matters just as much.
The ideal angle for UK solar panels sits between 30° and 40°. This angle helps panels catch sunlight efficiently across the seasons, whatever direction they face.
A steep or shallow pitch can reduce output, even on a perfect south-facing roof. Our installers assess pitch and direction together during every EcoGDEA survey.
What About East-West Split Systems?
If your roof has two sloped sides, you don’t have to choose. Split panels across east and west sides instead.
This setup produces around 15-20% less energy than a fully south-facing system, but spreads generation across the whole day.
Benefits of an east-west split:
- Captures morning and evening sun
- Matches typical household energy patterns
- Reduces reliance on grid electricity at peak times
- Works well without any south-facing roof space
Real-World Example
We recently surveyed a semi-detached home in Yorkshire with a pure east-facing roof. The homeowner worked from home and used most electricity before noon.
Rather than recommending against solar, our team sized the system to match morning demand. Paired with a battery, the household now covers roughly 70% of daytime usage from solar alone.
This shows orientation alone doesn’t decide viability. Usage patterns matter just as much.
Want a tailored assessment for your roof? Visit our solar panels page to book a free survey.
Frequently Asked Questions
- Is east-facing solar panel installation worth it?
Yes. East-facing panels generate 80-85% of south-facing output. That’s still substantial savings, especially for morning-heavy households. - Can I mix south and east-facing panels on one roof?
Yes, if your roof has multiple slopes. This spreads generation across more daylight hours. - Do west-facing panels perform differently to east-facing ones?
Not by much. Both directions produce similar overall output, just at different times of day. - What’s the worst roof direction for solar panels?
North-facing roofs perform worst, producing roughly 60% of south-facing output in most UK installations. - Does roof angle affect east-facing panel performance?
Yes. A 30-40° pitch helps any orientation perform closer to its potential. - Should I add a battery with an east-facing system?
Battery storage pairs particularly well with east-facing setups. It stores morning surplus for evening use. - How do I know which direction my roof faces?
Check a compass app, satellite maps, or ask an installer during a site survey. - Will an east-facing roof still qualify for solar grants or schemes?
Yes. Most UK schemes don’t require south-facing roofs, only a viable, unshaded installation









