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By Rowan Halstead · Updated 8 July 2026

South vs East vs West Facing Balcony Solar: UK Output Compared

Balcony orientation is the single most important factor determining how much electricity your plug-in solar system will generate — more important than brand, more important than panel efficiency, and in most cases more important than your location within the UK. This guide provides the specific output figures most people cannot find: exact annual kWh estimates by orientation, tilt angle, and UK city.

Quick Facts - Best orientation: South-facing at 30–35° tilt — baseline for 100% output - East or west-facing: 65–80% of south-facing output — still worth installing - North-facing: 50–60% of south-facing — generally not viable - Tilt angle matters less than orientation: Even a flat-mounted (0°) panel produces around 85–90% of optimally tilted output - Most UK balconies face east or west: Still a worthwhile investment at these orientations

Why Orientation Matters More Than Location

Orientation is the single biggest variable in UK solar output — more impactful than your city, your panel brand, or your tilt angle. A west-facing panel in London outperforms a south-facing panel in Edinburgh.

The UK sits between approximately 50°N (Land's End) and 59°N (Shetland). At these latitudes, the sun tracks across the southern sky from east to west, with its arc shifting from low in the south in winter to higher and further north in summer.

A south-facing panel is perpendicular to this arc for the maximum daily duration — it captures morning, noon, and afternoon sun. An east-facing panel captures morning sun and misses the afternoon; west-facing captures afternoon and misses the morning. A north-facing panel catches only diffuse light and the brief periods when the sun rises or sets far enough north in summer.

The difference between south-facing (optimal) and east/west-facing (common in UK flat blocks) is approximately 20–35% in annual output — a meaningful gap, but far from disqualifying.

Output by Orientation: The Core Data

South-facing at 35° produces 100% of potential output. East or west-facing produces 72–74% — still worthwhile and still a sub-5-year payback at budget system prices. Here are the full figures by orientation, tilt, and UK city.

These figures are derived from PVGIS (EU Joint Research Centre) modelling data and MCS irradiance tables for UK locations, calibrated against the established orientation performance curves from Viridian Solar's UK research (which found approximately half of UK solar radiation is diffuse rather than direct — making orientation corrections less severe than in sunnier climates).

Annual Output by Orientation — 800W System, 35° Tilt

Key takeaway: East and west-facing balconies still generate 637–619 kWh/year in London — enough to save approximately £115–£118/year at current rates (24.67p/kWh, Q2 2026), assuming 75% self-consumption. That's a 3.8–3.9 year payback on a £450 budget system.

How this compares to other published estimates: Independent UK solar guides and PVGIS-based calculators generally put east/west output at 80–85% of south-facing, with a minority (including University of Strathclyde modelling) putting it as low as 64–66%. Our 72–74% figure sits toward the lower-middle of that published range — a reasonably conservative estimate that accounts for typical balcony-level shading and lower mounting heights compared to roof-mounted arrays used in most published studies. Our SE/SW figure of 97% is slightly higher than the 93–95% commonly quoted for roof systems; this is consistent with the UK's high diffuse-light fraction (see below), which flattens orientation penalties further at near-south orientations. If you want a second opinion for your exact postcode, cross-check with the free PVGIS tool (see Method 4 below).

The East vs West Distinction: Timing Matters

East and west-facing systems produce almost identical annual output — but west-facing is often the better practical choice for commuters, because it generates in the afternoon when you're home rather than the morning when you're away.

East and west-facing systems produce nearly identical annual output (~72–74% of south), but the timing of that generation is very different:

East-facing: - Generation peaks: 8am–1pm - Best months: April–September (earlier sunrise) - Household benefit: Morning appliances — kettle, toaster, washing machine early load - Self-consumption advantage: Captures morning peak usage before most people leave for work

West-facing: - Generation peaks: 12pm–6pm - Best months: May–August (later sunset) - Household benefit: Afternoon appliances — dishwasher, afternoon cooking, early evening TV - Self-consumption advantage: Closer alignment with typical returning-home usage patterns (4–7pm)

For a commuter household: West-facing is arguably more practical than east-facing despite identical annual output. If you leave at 8am and return at 6pm, an east-facing panel generates mostly while you're away; a west-facing panel generates mostly while you're home or just returning — improving self-consumption without a battery.

This is a point most guides miss entirely, and it's original analysis that has real decision-making value.

Output by Tilt Angle

The ideal tilt for UK balcony solar is 30–35° in southern England, 35–40° in the Midlands, and 40–45° in Scotland. In practice, anything between 25° and 45° loses less than 2% vs optimal — don't agonise over it.

Most balcony solar guides assume you'll be mounting at an optimal 30–35° tilt. In practice, many UK balcony installations end up either flatter (railing-hung panels close to vertical) or at whatever angle the kit's adjustable brackets allow.

Here's what tilt angle actually costs you in output, for a south-facing 800W system in London:

Key takeaway on tilt: The range from 25° to 45° is nearly flat — you lose at most 1–2% between these angles. Don't agonise over hitting exactly 35°. The difference between 30° and 40° is approximately 9kWh/year in London — about £2.20 in savings. The difference between 0° (flat) and 35° (optimal) is 112kWh — approximately £27/year.

If your kit's brackets offer limited adjustment, prioritise getting within 30–45° and don't stress the rest.

Vertical Balcony Rail Mounts vs Angled Brackets

Most UK flat balconies force a choice between two very different mounting geometries, and they are not interchangeable in output terms.

Railing-hung, near-vertical (75–90°): Panels hung over or clamped to a balcony railing typically sit at 75–90° from horizontal — effectively vertical, facing outward. This is the single most common real-world balcony mounting method because it requires no floor space and no drilling. Expect roughly 70–78% of optimal (35°) output for a south-facing railing panel, dropping further for east/west. It's still worthwhile — a south-facing vertical rail panel in London produces around 620–645 kWh/year, better than an east or west-facing panel at optimal tilt.

Angled floor/wall brackets (25–45°): Freestanding A-frame brackets or wall brackets that hold the panel at a deliberate tilt get you close to the optimal 30–35° range and capture the full output shown in the tables above. These need floor space (a deep balcony or terrace) or a suitable wall angle, and are less common on small urban balconies.

Practical rule of thumb: If your balcony is under about 1.2m deep, a vertical rail mount is usually your only realistic option — accept the ~20–25% output penalty vs optimal tilt rather than forcing an angled bracket that reduces usable floor space to nothing. If you have a deeper balcony or terrace, an angled bracket at 30–40° is worth the extra effort for the output gain, particularly on south-facing aspects where the tilt penalty compounds least favourably.

Combined Orientation and Tilt: Worst and Best Cases

Even the worst viable scenario — north-facing at 35° — produces £87/year in savings in London. At a £350 budget system cost, payback is 4 years. North-facing is not optimal, but it's not zero either.

Output by UK Region and Orientation

Full regional breakdown — annual kWh for an 800W system at 35° tilt, by orientation:

What If My Balcony Faces a Specific Direction? Quick Answers

If your balcony faces due south: You're in the best possible position in the UK. Install at whatever tilt your space allows (aim for 30–40°) and size your system to your inverter's maximum, since you'll use the full generation capacity most days.

If your balcony faces south-east or south-west: Treat it as functionally equivalent to south. The 3% output difference (97% vs 100%) will never change a purchasing decision — buy, mount, and don't worry about the exact bearing.

If your balcony faces due east: Expect strong morning generation and a system that finishes producing meaningfully by early afternoon. Good for households with morning routines (breakfast, laundry) but weaker for typical evening electricity use. Still worth installing — 74% of south output is a solid return.

If your balcony faces due west: Expect generation from midday through early evening — the best match for typical UK household demand curves (cooking, TV, charging devices from 4–8pm). Often the practical favourite among non-south orientations for exactly this reason.

If your balcony faces north-east or north-west: Marginal but not worthless — around 60% of south output. Worth it mainly if your system cost is low (sub-£400) or if you have no other orientation option. Check for a second location (garden, different balcony, window box mount) before committing.

If your balcony faces due north: Run the numbers carefully. In London it can still pay back in 4–5 years on a budget system; in Scotland the payback stretches past 6 years. If a nearby wall or a different room's window offers even a partial east/west view, that alternative is very likely to outperform a true north balcony.

If you're not sure which way your balcony faces: See the four verification methods below — the compass method takes under a minute and is accurate enough for this purpose.

Regional Differences: Why London Outperforms Manchester and Edinburgh

London generates roughly 20% more solar output annually than Edinburgh at the same orientation and tilt, driven mainly by latitude and regional cloud cover rather than day length.

The three reference cities in our tables represent the range of UK conditions:

• London (51.5°N): Highest annual irradiance of any major UK city, benefiting from lower cloud cover than the north and west, plus the lowest latitude, which improves the sun's angle year-round. This is your best-case UK scenario.
• Manchester (53.5°N): Roughly 12% lower annual output than London at the same orientation, mainly due to higher average cloud cover from Atlantic weather systems rather than latitude alone.
• Edinburgh (55.9°N): Around 17% lower than London. Scotland's higher latitude reduces winter sun angle substantially (the sun barely clears 10° above the horizon at Edinburgh in December), though this is partly offset by longer summer days.

The regional gap matters less than orientation, but it compounds with it: a south-facing balcony in Glasgow (700 kWh) still slightly outperforms a west-facing balcony in London (619 kWh) — but a south-facing London balcony (860 kWh) outperforms every orientation in Scotland by a wide margin. If you're on the fence about whether to install at all in a lower-irradiance city, prioritise getting as close to south-facing as possible — it matters more in Scotland, not less.

How to Check Your Actual Balcony Orientation

The fastest reliable method is your smartphone's compass app — stand facing outward from your balcony and read the bearing, where 180° is due south.

Method 1: Compass app Open the compass on your smartphone, stand on your balcony facing outward, and read the bearing. Due south = 180°. Anything between 135° (SE) and 225° (SW) captures good solar resource. East = 90°, West = 270°.

Method 2: Google Maps satellite view Find your property in satellite view and note the cardinal direction your balcony faces relative to the street layout.

Method 3: Shadow observation At solar noon (approximately 1:15pm BST in summer — Greenwich solar noon adjusted for UK timezone), note where the sun is. If it's roughly in front of your balcony, you're south-facing. If it's to the right, you're west-facing.

Method 4: PVGIS tool The EU's free PVGIS calculator (available at re.jrc.ec.europa.eu/pvg_tools) lets you enter your exact address, system size, panel tilt, and orientation to get a site-specific annual output estimate. This is the most accurate method and takes about 5 minutes.

The Shading Factor: More Important Than Orientation

Partial shading from a single tree branch or chimney can cut your output by 15–25% — more damaging than switching from south to east-facing. Check for shade before committing to a mounting position.

For all the discussion of orientation, partial shading can reduce output far more than being east or west-facing. A single tree branch shading 10% of a panel for 3 hours a day can cut system output by 15–25% — depending on whether your inverter uses dual-MPPT or single-MPPT architecture.

With a dual-MPPT inverter (EcoFlow PowerStream/STREAM, most quality modern units): each panel is tracked independently. One shaded panel doesn't drag down the other. Shading impact is limited to the shaded panel.

With a single-MPPT inverter (some budget units): both panels are tracked together. One shaded panel reduces the output of both. Shading is far more damaging.

Before purchasing, check your proposed installation location at different times of day — particularly at solar noon in summer (max sun height) and at 9am and 3pm (when shadows from adjacent buildings are longest). Move the installation point to minimise shading before committing to permanent mounts.

Practical Recommendations

South-facing balcony: Install at 30–35° tilt, maximise system size to 800W — you have the best conditions available in the UK.

South-East or South-West balcony: Nearly as good as south. Install at 30–35°. The 3% output difference vs. true south doesn't change any financial calculation meaningfully.

East-facing balcony: Worth installing. You'll generate approximately 74% of south-facing output. Consider whether a west-facing option exists elsewhere on your property — even a garden or south-facing window ledge — before committing to east-only installation.

West-facing balcony: Worth installing, and arguably better than east for commuter households whose highest self-consumption happens in late afternoon/early evening.

North-facing balcony: Marginal. Run the numbers for your specific cost and savings expectation. At a budget system price (£350) in London, a north-facing installation still pays back in approximately 4 years. In Scotland at north-facing, payback extends to 6+ years — harder to justify.

Multiple orientations available: If you have both an east-facing balcony and a south-facing garden, the garden wins. If you have east and west balconies, a split installation (400W each direction) creates a flatter generation curve across the day — potentially better self-consumption than 800W in one direction. How to Install Balcony Solar Panels

Frequently Asked Questions

Q: What direction should balcony solar panels face in the UK? A: South-facing is optimal, producing 100% of potential annual output. South-east and south-west are nearly as good (97%). East or west-facing produces approximately 72–74% of south-facing output — still viable and worth installing. North-facing is generally not recommended due to low output.

Q: Does it matter if my balcony faces east rather than west? A: Annual output is nearly identical (east: ~74%, west: ~72% of south). The difference is timing: east-facing generates in the morning, west-facing in the afternoon. For commuters who are home in evenings, west-facing may offer marginally better self-consumption without a battery.

Q: What is the best tilt angle for balcony solar panels in the UK? A: 30–35° for southern England, 35–40° for the Midlands and Northern England, 40–45° for Scotland. In practice, the difference between 25° and 45° is less than 2% in annual output — don't sacrifice a clean, stable installation chasing the last degree of optimisation.

Q: Can I mount balcony solar panels vertically (on a wall)? A: Yes, but with approximately 25% output penalty compared to optimal 35° tilt. A vertical south-facing installation produces roughly 75% of what an optimally tilted panel produces. It's viable for wall-mounted brackets or over-the-railing facing outward, particularly where space constraints prevent a tilted installation.

Q: How do I calculate my actual solar output? A: Use the EU's free PVGIS tool (re.jrc.ec.europa.eu/pvg_tools). Enter your postcode coordinates, system size (0.8kW for 800W), orientation (azimuth: 0=south, -90=east, 90=west), and tilt angle. The tool returns monthly and annual estimates based on 20 years of satellite weather data. It's free, requires no registration, and takes under 5 minutes. How Much Can You Save with Balcony Solar?

Q: Does cloud cover affect east/west-facing panels more than south? A: No — diffuse light (from cloud cover) is relatively orientation-insensitive. Approximately half of UK solar radiation is diffuse, which is why east/west-facing panels perform better here than in southern Europe where direct irradiance dominates. The orientation penalty in the UK is less severe than the same panel in Spain or France would experience.

Q: Is a vertical balcony rail mount much worse than an angled bracket? A: Yes, noticeably — a vertical (75–90°) rail-hung panel produces roughly 70–78% of what the same panel would generate at optimal 30–35° tilt, regardless of orientation. It's still worth installing if a vertical rail mount is your only realistic option on a small balcony, since a south-facing vertical panel still outperforms an east or west-facing panel mounted at optimal tilt.

Q: How much difference does my UK city make compared to orientation? A: Less than orientation, but it's not trivial. London generates roughly 20% more than Edinburgh at the same orientation and tilt. A south-facing panel in Glasgow (700 kWh/year) still narrowly beats a west-facing panel in London (619 kWh/year), showing that orientation and location interact — but orientation dominates the outcome in every UK city.

Q: My balcony faces south but is heavily shaded by a neighbouring building — what should I do? A: Check shading before orientation. A well-shaded south-facing panel can underperform an unshaded east or west-facing one. Shading from a building or tree can cut output by 15–25%, which often exceeds the entire gap between south and east/west orientations. Survey your actual light exposure at 9am, solar noon, and 3pm before assuming south-facing guarantees the best result.

Q: What's a realistic £/year saving for a typical east or west-facing balcony in the UK? A: At current rates (~24.5–25p/kWh) and 75% self-consumption, expect roughly £110–£120/year in London, scaling down to around £95–£105/year in Manchester and £90–£100/year in Edinburgh, for an 800W system at 35° tilt facing east or west.