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?