East/West vs South-Facing Roof Solar (UK): Is It Still Worth It?
South-facing isn't the only option. East/west roofs can be excellent for solar — sometimes even better for self-consumption.
Output Comparison
| Orientation | % of South Output | Peak Generation | Best For |
|---|---|---|---|
| Due South | 100% | 11am–2pm | Maximum total generation |
| South-East | ~95% | 9am–1pm | Morning-heavy households |
| South-West | ~95% | 12pm–4pm | Afternoon/evening use |
| East | ~80–85% | 7am–12pm | Morning routines, WFH |
| West | ~80–85% | 1pm–6pm | Evening cooking, EV charging |
| East + West Split | ~85–90% | 7am–6pm | Spread generation across day |
Based on a 30–35° pitch in central England. Actual performance varies by latitude, shading, and panel technology.
Why East/West Can Be Better
Longer Generation Window
East/west splits generate from early morning to evening — matching typical household consumption patterns better than a south-facing midday peak.
Higher Self-Consumption
Without a battery, east/west systems can achieve 35–50% self-consumption vs 25–35% for south-only. Less energy exported, more used directly.
More Panel Capacity
Using both east and west roof planes lets you install more panels than a single south face — potentially generating more total energy despite lower per-panel efficiency.
Smoother Export Profile
Flatter generation curves mean less grid stress and potentially better future smart tariff rates. DNOs prefer distributed generation profiles.
When South Is Still Better
- You're maximising SEG export income (higher peak output = more export)
- Limited roof space — south gives best kWh per panel
- You have battery storage to time-shift the midday peak
- Your east or west roof has significant shading
- You're on a flat export tariff (not time-of-use)
Not Sure About Your Roof Orientation?
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