ShadeFix: the new alternative to module optimisers

Introduction In the world of photovoltaics, optimizing energy production is essential to ensure a safe and profitable investment. A recent study by the University of Southern Denmark analyzed the main optimization solutions available, demonstrating how SMA ShadeFix represents a superior technology today compared to traditional module-level optimizers. Why optimization is crucial in photovoltaic systems The performance of a PV system depends not only on the quantity of energy produced, but also on the continuity of performance throughout the entire useful life of the system. One of the main problems to be addressed is the shading Trees, chimneys, dormers, or simply clouds can reduce production. For this reason, various optimization technologies have been developed over the years, with very different results in terms of reliability and maintenance costs. What is ShadeFix and How Does It Work? SMA ShadeFix It is an integrated software technology, derived from the OptiTrac Global Peak , available as standard in most inverters SMA , which does not require additional components. It activates automatically upon commissioning and uses an advanced algorithm. Maximum Power Point Tracking (MPPT) to always guarantee the maximum possible performance, even in the presence of partial shadows. The main problem with shaded photovoltaic systems is that the power curve (PV) can present more peaks : the so-called local maximums (LMPP) and a global maximum (GMPP). A conventional MPPT risks “catching” on a local peak, limiting production. ShadeFix solves this limitation in two ways: cyclically analyzes the entire power curve, with an algorithm “ anti-local trapping " which distinguishes local maxima from the global one. The algorithm typically operates with an interval of about 6 minutes, useful for balancing optimization and stability; the interval can, in some cases, be manually adjusted. adapts the inverter's operating point dynamically, so as to keep the system as close as possible to the GMPP , even if some of the modules are shaded. When a string experiences partial shadows, ShadeFix then allows the bypass diodes of the affected modules to come into operation, isolating the shaded section and allowing the other modules to operate at maximum available power. Availability and Activation The ShadeFix function is present by default from the moment the inverter is commissioned, at no additional cost, and is automatically activated via firmware update starting from September 2019 Want to know more about ShadeFix SMA? ShadeFix vs. Traditional Optimizers: More Power, Fewer Components The study of the University of Southern Denmark compared three approaches: two solutions with module-level DC optimizers (MLPE) and the technology ShadeFix by SMA , based on string-level optimization. Some interesting insights emerged from the research: 1] Higher Energy Production and Higher Average Yield ShadeFix allows you to obtain more energy produced compared to systems with traditional optimizers under conditions of no, light or moderate shading . The Traditional optimizers, on the other hand, show an advantage in the most extreme cases , as systems with permanent shading or particularly complex configurations. 2] Fewer electronic components required and lower operational risks Another strong point of SMA ShadeFix is the simplicity of the system . Unlike module optimizers, which require thousands of additional electronics installed under each panel, ShadeFix is a one-stop solution completely software , already integrated into the inverter. This brings significant advantages: Fewer components = fewer failures : by reducing complexity, the probability of malfunction is lowered and greater operational continuity is ensured. Greater security : the absence of electronic devices on the roof reduces the risk of fire, wear and tear from humidity and thermal cycles, as well as simplifying maintenance operations. Reduced management costs : any interventions are concentrated on the inverter, which is easily accessible, without the need to dismantle the modules and spend hours working on the roof. To give a concrete idea, in a 50 kW commercial system a system with ShadeFix takes approximately 2,000 electronic components , enclosed in a single protected casing. A system of the same power with traditional optimizers can include up to 60,000 electronic components , exposed to humidity, temperature variations and external agents. Finally, in markets where regulations require MLPE devices for rapid disconnection, SMA ensures safety and compliance thanks to certified solutions SunSpec , without introducing the complexity typical of modulo optimizers. Do you want to learn more about the results of the study by the University of Southern Denmark who analyzed ShadeFix and traditional optimizers? When to opt for a system with ShadeFix Technology? ShadeFix is the ideal solution in all those situations where it is necessary to guarantee efficiency, simplicity and reliability , without introducing additional costs or complexity. In particular, it is recommended when: the system is subject to light or occasional shading ; desires lower installation and maintenance costs and greater operational continuity over time; you don't need individual module-level monitoring, but string-level monitoring is sufficient; you want a system simple to design, install and manage , with a reduced number of electronic components. In summary, SMA ShadeFix is designed for those looking for an optimization technology capable of maximize energy efficiency in the long term , while ensuring safety, ease of management and reduction of operational risks. Do you need a free consultation? Our technical-sales department is available to evaluate your project and show you how to reduce maintenance costs and maximize energy production over time. *Attention: Our services are dedicated exclusively to professionals in the sector