Solar Energy (Photovolatics)
Bifacial panels are now somewhat widely available on the market. Yet, they account for a small share of the PV systems deployment. This is mainly due to a lack of general knowledge on how to design and optimize an adequate bifacial PV system : at what tilt angle? At what height? How to connect the panels to the racking, what orientation is best and what are the advantages of glass-glass bifacial PVs Vs standard framed bifacial PVs? We will cover all important aspects of bifacial PV design, highlight the differences with standard (mono facial) PVs systems, and discuss tricks to boost yields, such as anchoring instead of ballasting, or how to mitigate the impact of wind deflectors, and how to avoid shadows under the PVs by spacing-out the vertical structures. Information on design and performance of bifacial PV systems is rare, seldom discussed in scientific publications, namely because of the rarity of real-field bifacial PV projects, and the relative novelty that bifacial PV represents. Many industry actors, such as banks and large national developers, have started saying publicly that bifacial PVs are the best mean of increasing solar profitability, and we believe the solar developers in the audience will greatly benefit, and find interesting, the experience and conclusions we will present, to help them make better decisions on how to optimize their bifacial PV systems. For instance, bifacial PV can help melt snow from PVs, and we will present the theory of this and the real results, with pictures a side-by-side test bed. The presentation aims to address the key considerations in design to obtain a design that is ideal for Bifacial panels and will demonstrate the performance achievable with this technology when all optical and electrical considerations are ideal by showing images and discussing real-life experience with carport, ground-mounts, and rooftop projects. More precisely, the speaker’s team has 1 full year worth of data of a MW-scale rooftop and carport system in an extreme snow environment, that he will present, along with visually stunning pictures and technical explanations on why it was done that way and what the results were. The most important element for bifacial PV design is to avoid having shading at the back of the modules, because shading on even only one cell could in turn impair a complete string of cells. This can be counter-intuitive, and we will present how mounting the panels different ways in different geometries can create or avoid shading and hot spots. Our studies demonstrated that optimization of a bifacial PV system can lead to a potential of generating 24%+ more energy by using bifacial panels, in real operating conditions. PV manufacturers promise that, we want to help developers get there!).