East or West Facing: Is Plug-in Solar Still Worth It?

Not everyone has a south-facing balcony, garden, or wall. If your available space faces east or west, the natural question is: is plug-in solar still worth the money?

The short answer: yes, usually. The longer answer involves some maths.

How Much Less Do East/West Panels Generate?

A south-facing 800W system in central England generates roughly 650-800 kWh/year. An east- or west-facing system of the same size generates roughly 520-640 kWh/year — around 15-20% less.

That's not as bad as people assume. You're losing a fifth of output, not half. The sun doesn't only shine from the south — it sweeps across the sky from east to west throughout the day. East and west-facing panels simply capture more of the morning or afternoon sun respectively, and less of the midday peak.

The UK-specific advantage: British weather is predominantly overcast. Under cloud cover, direct sun angle matters less because light is diffused from all directions. On the 60%+ of days when it's cloudy, an east-facing panel performs almost identically to a south-facing one.

East vs West: Which Is Better?

In raw annual generation, there's very little difference — east generates roughly 2-3% more than west in the UK due to clearer mornings (afternoon thermals create more cloud).

But the timing difference matters for self-consumption:

East-facing panels generate most electricity between 7am and 1pm. Good if you're home in the morning — working from home, retired, or a stay-at-home parent. Morning generation powers breakfast appliances, laptops, and daytime loads.

West-facing panels generate most electricity between 12pm and 7pm. Better for catching late afternoon and early evening sun, when you're more likely to be home from work. In summer, west-facing panels generate well into the evening.

If you work from home, east is marginally better (more morning output when you're using electricity). If you work standard hours and are home in the evening, west is better (more late-afternoon output for when you return).

The Financial Case

At current grid rates (~27p/kWh):

South-facing 800W system:

• Annual generation: ~700 kWh
• Self-consumed at 40%: 280 kWh × 27p = £75.60/year
• With battery at 75%: 525 kWh × 27p = £141.75/year

East/west-facing 800W system:

• Annual generation: ~570 kWh
• Self-consumed at 40%: 228 kWh × 27p = £61.56/year
• With battery at 75%: 428 kWh × 27p = £115.56/year

The difference is roughly £14-26/year depending on battery use. Over 20 years, that's £280-520 less — meaningful but not a dealbreaker when the system costs £500-950.

Payback period comparison:

• South-facing: 4-6 years
• East/west-facing: 5-8 years

Still comfortably within the 25-year lifespan of the panels.

When East/West ISN'T Worth It

North-facing. If your only available space faces north (315-45 degrees), the output drops to 50-60% of south-facing. That pushes the payback period beyond 10 years, which starts to erode the financial case. North-facing plug-in solar is marginal at best.

Heavy shading. If your east or west-facing space also has significant shading from neighbouring buildings or trees, the double penalty (wrong angle + shade) may reduce output below viable levels. Use our savings calculator to estimate with your specific postcode and orientation.

Very short payback requirement. If you need your money back in 3 years, east/west won't achieve it without a battery and time-of-use tariff. If 5-7 years is acceptable, you're fine.

Optimising East/West Installations

Tilt angle matters more. For east/west facing panels, increasing the tilt angle slightly (to 40-45 degrees from horizontal, rather than the standard 35 degrees) can recover some of the orientation loss. Adjustable tilt brackets let you experiment with different angles.

Two-panel split. If you have space on both an east and west-facing surface, mounting one panel on each gives you generation across the whole day — morning from the east panel, afternoon from the west. This wider generation window improves self-consumption because you're covering more of your daily usage pattern.

Battery storage helps more. With south-facing panels, generation is concentrated around midday. With east or west-facing panels, it's spread across the morning or afternoon. A battery like the EcoFlow DELTA 2 captures generation whenever it happens and delivers it when you need it — reducing the timing disadvantage.

Monitor and optimise. A smart plug on your inverter output shows real-time generation throughout the day. After a few weeks, you'll see exactly when your panels produce the most — and can shift your high-draw appliances (washing machine, dishwasher) to match.

The Bottom Line

East and west-facing plug-in solar generates 15-20% less than south-facing. That's a reduction, not a disqualification. The financial case still works — you just wait 1-2 years longer for payback.

If your only available space faces east or west, don't let the orientation put you off. The economics are solid, the system still pays for itself, and 80% of optimal output is a lot better than 0%.

For realistic savings based on your specific postcode and orientation, use our calculator. For installation guidance, see our step-by-step guide.