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  • A Closer Look at the Climate Impact of our Vertical PV Unit

    Sustainability is not just a buzzword; it's a guiding principle for innovation, especially in the world of solar energy. At Over Easy Solar, we're proud to introduce a new concept in the PV industry – prefabricated PV units with vertical bifacial solar panels. The VPV Unit promises to enable more buildings with flat rooftops to install solar, like for example existing sedum rooftops. To further prove and enhance the sustainability, we've partnered with Fraunhofer ISE to conduct a Life Cycle Assessment (LCA), focusing on the carbon footprint of this groundbreaking idea. Product Spotlight Product Name: Over Easy Solar Vertical Photovoltaic (VPV) Unit Product Description: The Over Easy Solar VPV is a solar unit featuring vertically mounted bifacial solar panels on a structural frame. It offers easy transport, lightning-fast installation (over 10 times quicker than traditional systems), simplified logistics, and minimal rooftop assembly. Plus, it makes building maintenance a breeze and can be integrated into eco-friendly building designs, including green roofs. The Global Connection Our production reaches across the globe. While some crucial components are manufactured in China, the structural frame is crafted in Spain and then transported to the assembly facility, also in Spain. This international collaboration ensures we tap into the highest level of quality and expertise throughout our product's journey, but it also introduces challenges that we are highly aware of – such as long transportation distances and risk connected to the working conditions in the PV supply chain in China. Tommy Engvik, Co-founder and Chief Commercial Officer of Over Easy Solar, states: “Sustainability is our primary concern, and it is why we founded the company. We have our feet on the ground, we personally inspect our suppliers’ facilities, and we have clear guidelines on how our suppliers should source materials and inputs for manufacturing” Breaking Down the LCA We have done a Life Cycle Assessment in collaboration with Fraunhofer ISE, following some important principles: Functional Unit: We're evaluating the environmental impact of producing 1 kWp (kilowatt-peak) of our photovoltaic module. Data Sources: We used SimaPro software and drew data from the Ecoinvent 3.8 database, in addition to using Fraunhofer ISE’s own collected data, following the IPCC2021 GWP100 method. System Boundary: Our study focuses on the phase from raw materials to the gate, excluding end-of-life considerations. The Climate Impact Our LCA revealed some crucial insights: Solar cell manufacturing contributes to 57% of the total carbon footprint. Within this, poly-Si, a key component, accounts for 47% of the emissions from solar cell production. PV panel manufacturing, excluding solar cells, sees 58% of its carbon footprint coming from glass. The structural frame plays a smaller role, making up 10% of the total carbon emissions. According to our calculations, the CO2 footprint from the solar energy over the lifetime of the product, will typically be in the range of 15-25 gCO2e/kWh. As a comparison, the footprint for the German power mix in 2022 was 385 gCO2e/kWh (link). What's Next? To make our Over Easy Solar VPV even more eco-friendly, we have some strategies in mind: We're exploring if we can make solar panels with specially sourced low-carbon wafers and solar cells. We're optimizing material usage to reduce waste – for example, we re-use packaging in several steps of our value chain. We're exploring local manufacturing in regions with a higher share of renewable energy sources in their electricity mix and shorter transport distances. We will soon develop an Environmental Product Declaration (EPD) for our product – the first EPD in the solar industry to entail all the materials included in a rooftop solar installation. These steps could significantly reduce our carbon footprint and further highlight the sustainability of our innovative solar solution. At Over Easy Solar, we're committed to working with the best partners and continuously improving our supply chain to create one of the most sustainable solar products available. Read more: See also our research webpage where we highlight more of the research from our collaborations with Fraunhofer ISE and others.

  • NEWS: Over Easy Solar Receives Investment from Katapult

    Oslo, 5 October 2023 Over Easy Solar has been selected to receive investment from Katapult. Of 2500 candidates who were assessed for the accelerator program, the top 1% of the startups have been selected. In total, the recruitment round screened startups from 6 continents and around 62 countries, and the selected 23 companies represent 13 different countries and span 5 continents. These 23 startups will take part in the Katapult 2023 accelerator program: an accelerator program specifically designed for high impact Ocean- and Climate-tech companies. This award-winning program is Katapult’s flagship accelerator program and has received international praise for being the most comprehensive impact program in the world. Over the next three months, Over Easy Solar will strengthen their skills in impact, strategy, management and investor readiness through a combination of video modules and hands-on workshops. Over Easy Solar will also benefit from entering a network of international mentors, industry players and investors. Jørn Haanæs, Investment Director of Climate says: “We’re investing in the most impressive teams building scalable solutions to combat climate change, and out of the thousands seed-stage companies we looked at this year, we’re proud to say that Over Easy Solar was among the top, and we’re excited to follow their journey over the coming decade." As much as legacy photovoltaic panels can contribute to distributed clean energy production, a considerable amount of buildings are technically limited to adopting it, or owners are still concerned about the challenges and risks of owning and maintaining such systems. Over Easy Solar identified this problem and has developed vertical bifacial solar panels, specifically designed for flat rooftops. Trygve Mongstad, CEO of Over Easy Solar is delighted to have the support of the Katapult community: "With the support from Katapult we can accelerate our journey to make solar energy possible for more buildings, and cities can take advantage of more resilient buildings and energy grids.” About Katapult Katapult VC is a global investment company focusing on early stage impact driven technology startups. Katapult has made 169 investments in impact tech startups from 47 different countries. Katapult invests within three investment verticals: Ocean-, Climate- and Food-tech. Katapult has run ten flagship accelerator programs and three corporate accelerator programs. In 2021, Katapult launched the Katapult Foundation with the aim of building a larger network around impact investing. Katapult also hosts the annual Katapult Future Fest in Oslo, bringing together founders, investors and some of the most prominent figures within impact investment.

  • NEWS: Over Easy Solar launches research website

    Over Easy Solar Launches Research Website to Accelerate the Energy Transition Oslo, 24 August 2023 – Over Easy Solar, a pioneering startup at the forefront of solar technology advancement, is thrilled to introduce its new website dedicated to the exploration of vertical bifacial solar installations. The website, accessible at, serves as a platform to share research findings, insights, and projects aimed at driving the energy transition through innovative solar solutions. As a company committed to the development of groundbreaking technologies and pioneering research, Over Easy Solar recognizes the significance of efficient knowledge dissemination. The newly launched website offers a wealth of information, including: 🔆 Energy Yield from Vertical Bifacial Solar Panels: Delve into the enhanced energy capture potential of vertical bifacial solar panels and their impact on energy generation. 💨 Wind Loads for Vertical Solar Panels: Gain insights into the aerodynamic performance of vertical solar installations, ensuring structural stability and reliability. 🌱 Quality and Sustainability: Explore the commitment of Over Easy Solar to delivering top-tier quality and sustainability in every facet of their vertical solar solutions. 🏞️ Green Roofs with Vertical Bifacial Solar Panels: Discover the seamless integration of vertical solar panels with green roof systems, exemplifying the company's dedication to harmonious urban landscapes. Over Easy Solar's CEO, Dr. Trygve Mongstad, emphasized the significance of this initiative: "With the launch of, we are taking a stride towards democratizing knowledge in the renewable energy sector. By sharing our research outcomes and experiences, we aim to empower industry professionals, researchers, and enthusiasts to contribute to the global energy transition." Visitors to the website are encouraged to actively engage with Over Easy Solar and reaching out with thoughts and questions. For more information and to explore vertical bifacial solar installations, visit

  • Why are Green Roofs so Important?

    This summer I worked as an intern at Over Easy Solar. My task was to inspect roofs in Oslo to check out the state of some of Oslo municipality's biosolar roofs, in other words green roofs with solar panels☀️🌿 Did you know that green roofs: 🌱 Reduce a Buildings Energy Usage? Green roofs have insulating abilities that help keep the inside temperature cool in the summer and store the heat inside the building in the winter. Saving energy has been one of the main motivations behind the green roofs I’ve visited this summer! 🌱 Are Great for Storm Water Retention? In urban areas, flooding and strained drainage systems have become increasingly evident with the increase in unpredictable extreme weather, also here in Oslo! Green roofs are able to hold on to rain water and release it slowly, delaying parts of the water entering the city drainage systems. This way, the green roofs help reduce the risk of flooding and avoid the need for upgraded drainage systems. 🌱 Help the Local Biodiversity? The second picture included in this post is from Storbylegevakten in Oslo, and while you might not see it in the picture, the roof was buzzing with bumblebees all over the sedum! Utilizing green roofs, especially in urban areas, increases the available area for bees and other pollinating insects to thrive. With the declining insect population in the world, giving green oases to our pollinators living in cities is extremely important. 🌱 Reduce the Temperature of the Surroundings? The vegetation on green roofs is able to reduce the temperature surrounding the roofs by several degrees! This effect is why green roofs can be crucial in mitigating what is called the “Urban heat island effect”, meaning the increased temperature in urban areas caused by lack of vegetation and waste heat, among other contributors. This is also positive for combination roofs, one of the main focuses of us in Over Easy Solar, as the green roof cools the PV panels and keeps the efficiency high! 🌱 Bind both CO2 and Air Pollution? The plants growing on the green roofs not only have the ability to bind CO2, our most abundant greenhouse gas, but also airborne particles clouding our urban air. Green roofs therefore help clean the atmosphere and the air we breathe every day! Included are some pictures from thriving green roofs I’ve visited during the summer. I hope you found this as fascinating as me, and that this can help spread awareness of the importance of green roofs in future urban planning, as we work together towards a more sustainable future☀️🌿

  • Now you can retrofit your green roof with a solar energy system

    With more and more cities around the world changing the building code and regulation to better adapt to the climate conditions. The cities must combine green roofs systems for retaining water and energy production to conform to the new standards. Currently you must divide the roof into sections dedicated to green roof or solar systems in combination with a water retention system. Using the Over Easy Solar unit you can combine your green roof 100 % with a solar energy system. The lightweight PV-Units from Over Easy Solar can easily be put on top of your Sedum roof without limiting or changing the function of the green roof itself. You have easy access to inspect, maintain and if needed repair the roof.

  • PRESS RELEASE: First Full-Scale Vertical Biosolar Rooftop Installed in Oslo

    For immediate release Oslo, June 26, 2023 – Over Easy Solar, a Norwegian solar startup, proudly announces the official opening of its first full-scale vertical biosolar rooftop installation on a rooftop in Oslo. This groundbreaking project, featuring the innovative VPV (Vertical Photovoltaic) unit, marks a significant milestone in the commercialization of vertical solar panels for green rooftops. Following a successful pilot project on the same roof in 2022, Over Easy Solar has made progress in product development and manufacturing, enabling the efficient installation and a tenfold increase in the size of the installation. Leveraging the unique advantages of the prefabricated vertical PV system, the entire mechanical installation was seamlessly completed within a single day, without the need for ballast or fastening. The collaboration and support from key stakeholders have been crucial to the realization of this extraordinary achievement. Over Easy Solar extends gratitude to Oslobygg KF and SMART Oslo for their commitment and support including pilot financing from SMART Oslo. Additionally, Over Easy Solar would like to thank Solenergi FUSen for their exceptional project management, which ensured the flawless execution of the installation. The VPV unit's integration of vertical solar panels and green rooftops represents a pioneering approach to harnessing renewable energy and promoting sustainable living. The full-scale installation has a peak power of 45kWp and should generate up to 50 000 kWh per year, calculating based on measurements from the pilot installation from last year. The installation is ballast-free and covers a total area of about 600 square meters. "We are thrilled to unveil this groundbreaking vertical biosolar rooftop installation" says Trygve Mongstad, CEO of Over Easy Solar. "This project represents a significant step forward in our mission to enable a greener, more sustainable future for urban rooftops. Our customers acknowledge that the benefits of our vertical solution for biosolar green rooftops are unmatched by any other product, and we look forward to delivering solar energy solutions to new and existing buildings in the coming years." To learn more about Over Easy Solar and its product, please visit our website and contact Trygve Mongstad or Tommy Engvik (Contact information below). About Over Easy Solar Over Easy Solar is a Oslo-based startup founded in 2021, dedicated to revolutionizing the integration of solar energy into the built environment. Through its innovative VPV unit, the company combines vertical solar panels and green rooftops to maximize energy generation and environmental benefits. Over Easy Solar is committed to driving the adoption of renewable energy sources, reducing carbon emissions, and creating a sustainable future for generations to come. For media inquiries, please contact: Trygve Mongstad Over Easy Solar +47 99228200 For customer or product inquiries, please contact: Tommy Engvik Over Easy Solar +47 900 44 266 Website:

  • PRESS RELEASE: Groundbreaking Ballast-Free Vertical Bifacial PV System for Flat Rooftop Mounting

    For immediate release Innovative Solution Approved by Leading Wind Certification Institute and Complies with European Regulations OSLO, 29 May 2023 – Over Easy Solar, a Norwegian startup developing solutions for flat and green rooftop solar, is proud to announce the wind certification and approval of their revolutionary ballast-free vertical bifacial PV system for flat rooftops. This cutting-edge solution has been extensively tested and approved for rooftop mounting according to European regulations, providing a game-changing alternative for energy engineers and installers. The news was made public in an article in PV Magazine Global today. Through an in-depth study conducted at I.F.I. Institut für Industrieaerodynamik GmbH in Aachen, Germany, the Over Easy Solar system has proven its reliability and efficiency, enabling secure installation on almost all flat roof buildings without the need for fastening or additional ballast. This innovative approach relies on friction to hold the panels in place, streamlining installation processes and minimizing costs. Key Features of Over Easy Solar’s Ballast-Free Vertical Bifacial PV System: Prefabricated unit: Over Easy Solar has developed a prefabricated unit featuring low-building vertical bifacial solar panels, specially designed for flat rooftop installations. Dimensions: The solar panels measure 22 cm in height, and with the integrated support structure, they stand at 27-34 cm above the rooftop. High bifaciality: Manufactured with Heterojunction (HJT) cells, the panels boast a remarkable bifaciality of over 95%, ensuring exceptional energy capture from both sides. Superior performance: Over Easy Solar’s pilot projects have demonstrated that vertical solar panels can achieve up to 20-30% higher specific yield than traditional flat roof solutions, maximizing energy generation. Lightweight: With a weight of 11 kg/m2 on the rooftop without the need for ballast, the units offer a lightweight and streamlined installation process. Versatile application: The system is compatible with all flat roofs and delivers optimal performance when combined with a green roof or high-albedo roofing membrane. Enhanced Energy Yield: The system generates the highest energy yield during morning, evening, and winter periods, enabling increased self-consumption and improved price recovery in variable-price markets. Dr. Trygve Mongstad, Founder and CEO of Over Easy Solar, expressed his enthusiasm about the groundbreaking product, stating: “With this unique product, we see that we solve many of the challenges for installers. The simplicity and ease of installation of a ballast-free and prefabricated setup will greatly accelerate flat-roof solar installations.” The wind tunnel tests, conducted on a 1:50 model equipped with 360 pressure taps at the esteemed I.F.I. Aachen wind laboratory, yielded remarkable results. Daniel Markus, representative of I.F.I. Institut für Industrieaerodynamik GmbH, remarked: “The aerodynamic performance of Over Easy’s system in our wind tunnel experiments was above our expectations, and the analysis indeed shows that these systems can be ballast-free for many typical flat-roof buildings, depending on the local wind conditions.” Furthermore, CFD simulations performed by Fraunhofer ISE demonstrated that the Over Easy Solar system exhibited negligible lift, even at wind speeds of up to 47 m/s. Lena Emmer, representative of Fraunhofer ISE, highlighted the findings, stating: “Our CFD simulations show negligible lift on the system, and the wind forces are mainly on the first panel of a row, while the other panels may have wind forces even acting against the main direction of the wind.” Over Easy Solar, a recipient of the prestigious SolarPower Europe Startup Award 2022 and the national Solar Award in Norway 2023, continues to revolutionize the solar industry with their groundbreaking technologies. For further information and media inquiries, please contact: Trygve Mongstad CEO, Over Easy Solar Email: Phone: +47 99228200

  • Combine your Green Roof with a Solar Energy System

    With more and more cities around the world changing the building code and regulation to better adapt to the climate conditions. The cities must combine green roofs systems for retaining water and energy production to conform to the new standards. Currently you must divide the roof into sections dedicated to green roof or solar systems in combination with a water retention system. Using the Over Easy Solar unit you can combine your green roof 100 % with a solar energy system. The lightweight PV-Units from Over Easy Solar can easily be put on top of your sedum roof without limiting or changing the function of the green roof itself. You have easy access to inspect, maintain and if needed repair the roof.

  • VPV (Vertical PV) in winter conditions, Oslo Norway

    Many of our customers ask how vertical solar panels work during the wintertime. Over the last two weeks, we’ve had some nice winter weather in Oslo that beautifully demonstrates how this works. From the data we share in the graph here, we can make some interesting observations: 1-5 December: Cloudy winter weather. Under these conditions vertical solar installations give almost the same yield as a conventional flat roof 10-degree tilt installation. 6-12 December: Sunny days with little or no snow cover. Under these conditions, the yield of vertical bifacial can be very good. For these days, the VPV yield is about 450% higher than the conventional installation. 13-18 December: Snow showers with some sun in between. The vertical solar installation gives good yields while the conventional installation is quickly covered with snow and “light’s out”.

  • Don’t Let Snow Conditions or your Latitude Stop your Solar Energy Ambitions

    PV modules need to face the sun and be in direct sunlight to function optimally. Where the average exposure to the sun varies very little around equator, the further north or south you come, the solar conditions changes dramatically both during the day and season. You have to find the best compromise between seasonal variations and solar optimum angel to position your solar PV-Modules. In addition to this, even a moderate snow fall stops the solar energy system completely. By using vertically mounted bifacial PV-Modules in pre-assembled unit, Over Easy Solar turn’s your latitude into an advantage! Generating energy from both sides of the PV module, gives close to double the number of solar hours close to mid-summer. This compensates to a large extent for the high yield during peak hours for a conventional setup. Having the main production earlier in the morning and early evening compared to a very high peak at noon. You will also find a higher yield compared to a conventional east-west setup from early fall, through the winter and spring. And you will find that moderate snow conditions will increase production, not stop it. In areas with extreme snow conditions the Over Easy Solar units are unaffected by large snow falls since all snow loads go directly to the roof structure not the PV-Unit.

  • Energy yield from vertically mounted bifacial solar panels

    More energy in the morning and in the evening with V-bifi Get two energy production peaks each day rather than one with east-west mounted V-bifi units from Over Easy! Mounted so the sunlight hits the panels on the east side in the morning and on the west side in the afternoon, you get one peak for the morning coffee and one for the evening activities. The figures displayed above show the energy production profile during a sunny summer day from one of our installations outside Oslo in Norway. As you can see, the energy production profile gives high yields in the morning and evening, and a total yield of 27% more energy during the day for east-west orientation. The energy also comes at a valuable time to stabilize the local electricity grid. The south-north installation has a bit lower yield than the conventional panels, but as can be seen in the following, this is more than compensated for by higher yields during the winter months.

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