https://www.pv-magazine.com/2023/11/10/researchers-shed-light-on-mysterious-higher-energy-yields-in-vertical-pv-systems/ Skip to content * Global * Germany * Spain * France * Italy * USA * Mexico * Latin America * Brazil * Australia * India * China pv magazine - Photovoltaics Markets and Technology Subscriptions [ ] [Search] * Global * Germany * Spain * France * Italy * USA * Mexico * Latin America * Brazil * Australia * India * China [ ] [Search] * Global * Germany * Spain * France * Italy * USA * Mexico * Latin America * Brazil * Australia * India * China * News + All news + Applications & installations o Commercial & industrial PV o Grids & integration o Residential PV o Utility Scale PV + Hydrogen + Energy storage + Industry & suppliers o Balance of systems o Modules & upstream manufacturing + Markets & trends o Finance o Markets o Policy + Opinion & analysis o Opinion & analysis o Guidelines + Press releases + Sustainability + Technology and R&D * Features + pv magazine UP initiative + pv magazine Hydrogen Hub + Energy storage + Marketplace o Guggenheim Solar Index o Market overview: Large-scale storage systems o Market overview: Microgrid control systems o Module Price Index o PV Project Exchange + Archived: Solar Superheroes * Events + All Events + pv magazine Roundtables + SunRise Arabia + Solar+Storage Espana + pv magazine Webinars + pv magazine Webinars: German + pv magazine Spotlights + Event calendar + External Events + pv magazine live + Videos * Awards + pv magazine Awards + Storage highlights * Partner news + Features o Soiling and solar + Special editions + White papers o Clean Power Research: Solar data solutions to maximize PV project performance o BayWa r.e. 2019 grid parity white paper + Partner news * pv magazine test + About + pv magazine test results * Magazine + 2024 + 2023 + Issues before 2023 + Special editions * About + About us + pv magazine team + Contact us + Newsletter subscription + Magazine subscription + Job board + Community standards * Advertise Researchers shed light on mysterious, higher energy yields in vertical PV systems Scientists in the Netherlands have sought to understand the reason for unexpected gains in vertical PV systems and found that these installations have a much higher heat transfer coefficient than their horizontally deployed counterparts. November 10, 2023 Emiliano Bellini * Commercial & Industrial PV * Modules & Upstream Manufacturing * Technology and R&D * Utility Scale PV * Netherlands [pv230038-fig1] A vertical PV system is installed, located near the TNO facilities in Petten, the Netherlands Image: TNO, EPJ Photovoltaics, Creative Commons License CC BY 4.0 Share Icon Facebook Icon Twitter Icon LinkedIn Icon WhatsApp Icon Email A group of researchers at the Netherlands Organisation for Applied Scientific Research (TNO) has conducted a series of tests and simulations to understand why vertical PV systems tend to provide unexpected yield gains compared to horizontal arrays and have found that vertical installations have much lower operating temperatures. "Although better than expected performance for vertical installation of bifacial PV has been reported at conferences and workshops, we haven't seen any publications that show that this is accompanied with a much lower operating temperature than you would expect for free-standing fixed tilt PV with the same total irradiance," the research's corresponding author, Bas B. Van Aken, told pv magazine. "These lower operating temperatures have a positive effect on the operating voltage. And thereby on the total energy generation, particularly under high irradiance conditions." In the study "Thermal model in digital twin of vertical PV system helps to explain unexpected yield gains," published in EPJ Photovoltaics, Van Aken and his colleagues explained that the voltage is influenced both by the amount of light and by the temperature of the solar cells. With increasing irradiance conditions, the voltage increases logarithmically, while with increasing temperature, the voltage decreases, typically by 0.3-0.4% per C. "For a standard system, we observed that under high irradiance conditions, the increase due to the light is offset by the decrease due to the higher operating temperature," Van Aken stressed. "However, for the vertical system, we observed that the operating temperature is not increasing so much and the voltage increase and decrease are more or less balancing." For its modeling, the group used digital twins, which are virtual representations that connect and visualize real-world assets, to create twins consisting of a real PV system and a copy in digital format. Digital twins are commonly used for operation and maintenance (O&M) of solar power plants. "The digital version mimics the output of the PV panels based on the time series of weather and other environmental data. The simulated values are compared to observed data," the scientists explained. Popular content They took their measurements in a vertical PV system located near the TNO facilities in Petten, the Netherlands. The east-west system features nine rows each equipped with eight 315 W bifacial modules, with the spacing between module rows being 2 m, 4 m, or 6 m, respectively. Of the 72 modules deployed in the system, 60 rely on n-type M2 TOPCon solar cells. All of the panels are equipped with power optimizers provided by Israel-based Solaredge. For its analysis, the group utilized an in-house developed extraction method and found that the heat transfer coefficients of the vertical panels are nearly double the values of the horizontal panels. Heat transfer coefficients define how heat energy passes from one material to another and are commonly used, for example, to make insulation in homes. They also ascertained that the vertical array operates at a temperature difference with respect to ambient that is "nearly halved," which they said results in a 2.5% higher annual energy yield. "These results show the importance of checking the actual operating conditions of emerging applications of solar panels," Van Aken concluded. "We expect that this effect has a 2-3% increase in annual electricity yield in the Netherlands, the lower operating temperature has a slowing effect on degradation mechanisms and the effect could be more significant in locations with higher irradiance conditions." This content is protected by copyright and may not be reused. If you want to cooperate with us and would like to reuse some of our content, please contact: editors@pv-magazine.com. Share Icon Facebook Icon Twitter Icon LinkedIn Icon WhatsApp Icon Email Emiliano Bellini [Emiliano] Emiliano joined pv magazine in March 2017. He has been reporting on solar and renewable energy since 2009. More articles from Emiliano Bellini [javascript protected email address] Related content Elsewhere on pv magazine... 11 comments 1. Frank McIntyre says: November 10, 2023 at 3:22 pm Hey Emilio, "cool" article!! If SolarEdge optimizers were not being used, what do you think would be the effect of module mismatch and bi-faciality mismatch on the performance of a regular string of vertical modules? Would the mismatch negate the benefits of lower operating temperatures? I'm assuming that mismatch would be greater in a vertical system vs. a horizontal system. Reply 1. Adrian Midgley says: November 13, 2023 at 9:28 pm Why? 2. Bob_WA says: November 11, 2023 at 7:23 am Also vertical panels would collect less dust / dead leaves / bird droppings, I wonder if that is a contributing factor? Reply 3. Pingback: Pesquisadores lancam luz sobre o misterio do alto rendimento de energia em sistemas fotovoltaicos verticais - pv magazine Brasil 4. Pingback: Uchenite razkrivat misteriozni, po-visoki stoinosti na dobiva na energiia pri vertikalnite fotovoltaichni sistemi - Inter Power 5. Pingback: Mysterious, higher energy yields in vertical PV systems - pv magazine USA 6. Pingback: Mysterious, higher energy yields in vertical PV systems | Best Renewable Energy Company in Nigeria 7. Joseph McCabe says: January 23, 2024 at 6:44 pm iNOCT and average and max Isc are reduced. Both these make for longer module life expectancy. Module can be designed with less costs due to vertical orientation. Doesn't really matter azmuth, but more lattitude helps if comparing other structural options. Reply 8. Pingback: Uchenite razkrivat misteriozni, po-visoki stoinosti na dobiva na energiia pri vertikalnite fotovoltaichni sistemi - Solar On 9. Pingback: Have we been doing Solar wrong all along? - Undecided with Matt Ferrell 10. 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