{"id":6770,"date":"2026-04-21T09:35:10","date_gmt":"2026-04-21T09:35:10","guid":{"rendered":"https:\/\/couleenergy.com\/?p=6770"},"modified":"2026-04-21T09:35:13","modified_gmt":"2026-04-21T09:35:13","slug":"vertical-bifacial-pv-vs-tilted-pv-systems-which-one-actually-performs-better","status":"publish","type":"post","link":"https:\/\/couleenergy.com\/de\/vertical-bifacial-pv-vs-tilted-pv-systems-which-one-actually-performs-better\/","title":{"rendered":"Vertikale bifaziale PV-Systeme vs. geneigte PV-Systeme: Welches System ist tats\u00e4chlich leistungsf\u00e4higer?"},"content":{"rendered":"\n

Most solar installations tilt south and aim for midday peak output. But a growing body of peer-reviewed research shows that vertical bifacial panels<\/strong> \u2014 mounted upright, facing east and west \u2014 outperform traditional tilted systems<\/strong> in specific and important conditions. Here is what the data actually shows, and when each approach makes sense.<\/p>\n\n\n\n

First, What Are We Comparing?<\/h2>\n\n\n\n

Traditional solar panels are mounted at an angle, typically facing south in the northern hemisphere, to capture as much direct sunlight as possible around midday. This is known as a tilted monofacial system<\/strong>, and it has been the industry standard for decades.<\/p>\n\n\n\n

A vertical bifacial system<\/strong> takes a completely different approach. The panels stand upright \u2014 at exactly 90 degrees \u2014 and face east and west simultaneously. They capture morning light on one side and evening light on the other. Because the panels are bifacial, they generate power from both faces at once.[1]<\/sup><\/p>\n\n\n\n

The comparison matters because these two system types do not just look different. They produce energy at different times of day, respond differently to weather, and suit fundamentally different site conditions.<\/p>\n\n\n\n

What the Research Actually Shows<\/h2>\n\n\n\n

In 2023, researchers Ghadeer Badran and Mahmoud Dhimish<\/strong> at the University of York<\/strong> conducted the first full-year empirical study of a commercial vertical bifacial system in a British climate, published in Scientific Reports<\/em> in August 2024.[2]<\/sup> Three systems were monitored side-by-side on the same rooftop from February 2023 to January 2024:<\/p>\n\n\n\n

System<\/th>Configuration<\/th>Technology<\/th><\/tr><\/thead>
VBPV<\/strong><\/td>Vertical, bifacial<\/td>HJT cells, 22.5% efficiency, white gravel reflector<\/td><\/tr>
VMPV<\/strong><\/td>Vertical, monofacial<\/td>Standard monocrystalline silicon, vertically mounted<\/td><\/tr>
TMPV<\/strong><\/td>Tilted, monofacial<\/td>Traditional angled rooftop installation<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Against the tilted system, the vertical bifacial setup delivered measurably stronger output across every season and time window tested.[2]<\/sup><\/p>\n\n\n\n

Metric<\/th>VBPV vs Tilted (TMPV)<\/th><\/tr><\/thead>
Morning output (05:30\u201309:00)<\/td>+26.91%<\/strong><\/td><\/tr>
Evening output (17:00\u201320:30)<\/td>+22.88%<\/strong><\/td><\/tr>
Winter seasonal gain<\/td>+24.52%<\/strong><\/td><\/tr>
Autumn seasonal gain<\/td>+20.27%<\/td><\/tr>
Spring seasonal gain<\/td>+19.32%<\/td><\/tr>
Summer seasonal gain<\/td>+14.77%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

On one high-performance day in May, the vertical bifacial system produced 4.92 kWh \u2014 approximately 25.38% more<\/strong> than the tilted system across that single day.[3]<\/sup> CFD modelling confirmed negligible lift forces at 27.2 m\/s (~98 km\/h).[2]<\/sup><\/p>\n\n\n\n

Why Vertical Bifacial Works Better at High Latitudes<\/h2>\n\n\n\n

\ud83c\udf05 The Sun Angle Problem<\/h3>\n\n\n\n

The UK sits between\u00a050\u00b0N and 60\u00b0N latitude<\/strong>. In winter, the sun rises low \u2014 often just 10\u201320 degrees above the horizon. A south-facing tilted solar panel is designed to catch high midday sun, but in British winters that midday sun is weak. A vertical east-west panel is geometrically better aligned to capture low-angle morning and afternoon light. That is why the winter advantage is the largest seasonal gain in the data.[2]<\/sup><\/p>\n\n\n\n

\u2601\ufe0f Diffuse Light Is the UK Norm<\/h3>\n\n\n\n

The UK averages only around\u00a01,000 to 1,200 sunshine hours per year<\/strong>.[4]<\/sup>\u00a0Overcast and diffuse conditions dominate. Under those conditions, the University of York study found vertical bifacial systems maintained approximately\u00a060% of peak output<\/strong>, while conventional solar panels dropped to around\u00a035%<\/strong>.[2]<\/sup><\/p>\n\n\n\n

\u26a1 The Double Peak Grid Advantage<\/h3>\n\n\n\n

Traditional tilted panels produce one energy peak at solar noon \u2014 when the grid has plenty of supply and prices are often lowest. Vertical east-west bifacial systems produce two peaks<\/strong>: one in the morning (05:30\u201309:00) and one in the evening (17:00\u201320:30). These align with household demand for heating, cooking, and EV charging.[5]<\/sup><\/p>\n\n\n\n

Research from the Leipzig University of Applied Sciences (HTWK Leipzig)<\/strong> confirmed that this shifted generation profile reduces the need for gas-fired peaker plants and lowers required electricity storage capacity, based on energy system modelling for Germany’s 2030 grid.[5]<\/sup><\/p>\n\n\n\n

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\ud83d\udca1 Key economic point:<\/strong> UK analysis estimated additional annual savings of approximately GBP 1,221 per 1,500 kWh baseline<\/strong>, using a GBP 0.28\/kWh tariff assumption \u2014 driven primarily by the vertical system’s alignment with higher-value morning and evening generation periods.[6]<\/sup><\/p>\n<\/blockquote>\n\n\n\n

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Image: Over Easy Solar<\/em><\/figcaption><\/figure>\n\n\n\n

Where Vertical Bifacial PV Delivers the Most Value<\/h2>\n\n\n\n

\ud83c\udfed Scenario 1: High-Latitude Commercial Rooftops<\/h3>\n\n\n\n

UK, Ireland, Norway, and Scotland are the strongest markets. Low winter sun angles and frequent overcast conditions favour vertical bifacial geometry.\u00a0White gravel or white membrane roofing<\/strong>\u00a0beneath the solar panels maximises rear-side reflectance and amplifies bifacial gain.[3]<\/sup><\/p>\n\n\n\n

\ud83c\udf3f Scenario 2: Flat Roofs with Green Roof Requirements<\/h3>\n\n\n\n

Vertical spar panels do not block rainfall or vegetation. Over Easy Solar’s first US commercial installation \u2014\u00a0100 kW, Queens, New York, April 2026<\/strong>\u00a0\u2014 was switched from a tilted layout to vertical to meet NYC’s Department of Environmental Protection priorities for green roof performance. Expected annual yield: approximately\u00a0120,000 kWh<\/strong>.[7]<\/sup><\/p>\n\n\n\n

\ud83c\udf3e Scenario 3: Agrivoltaic Systems<\/h3>\n\n\n\n

East-west vertical rows allow standard farming equipment to pass freely between panels. The 2025 Aarhus University study<\/strong> (Energy Nexus<\/em>) confirmed vertical bifacial panels generate electricity without reducing crop yields, with panels covering only ~10% of field area.[8]<\/sup><\/p>\n\n\n\n