Partial shading: A separate MPP tracker for each module ensures optimum yields, even with moving shadows.
Different orientations: The modules can even be operated on an east-/west-facing roof under uneven irradiation conditions.
Optimum utilization of roof surfaces: The micro inverter can generate electricity even in “inefficient” areas.
Small systems: Whether on the balcony or in the garden, the Sunny Boy 240 can be used in even the smallest PV system for private power generation.
A micro inverter system is also ideal for challenging applications with partial shading, a complex roof structure, small systems or different roof orientations.
PV inverters can be classified in the following three groups: micro inverters, string inverters and central inverters. They are distinguished primarily by the number of assigned PV modules. String inverters are to be found in classic residential PV systems and in small-size and medium-size industrial applications. Central inverters, on the other hand, are deployed in large-scale industrial systems and PV power plants. Micro inverters are the smallest existing inverter units. They convert direct current from each individual module into alternating current. They are based on the principle of modularity and can therefore be optimally adapted to specific local conditions.
Micro inverters bring their yield-related advantage to bear whenever individual local conditions such as shading, varying alignment or soiling of the modules, etc. are effective. According to an investigation by PHOTON magazine, the increase in yield in these cases is approximately five percent. Some manufacturers indicate even greater increases from 15 to 20 percent, but SMA cannot confirm this.
Apart from the costs for the inverter(s), you mainly need to consider the costs for the total PV system. These costs vary depending on the PV system design and size. For small PV systems, the system costs of both types of inverters will be fairly similar, although micro inverters in general pose a much lower entry barrier for PV. For PV systems with more than 5 kWp, we expect the system costs with one string inverter to be significantly lower.
Due to their mounting location, micro inverters are in general subject to much harsher environmental conditions. This and the higher number of inverters per PV system means that a micro inverter needs to be trimmed to a much higher reliability. SMA has achieved this goal by means of a fundamentally new (technical) design based on a consistent reduction in the number of components.
Micro inverters are ideally suited for the modular extension of smaller-scale PV systems. In particular, they lend themselves to challenging applications. These may involve e.g. partial shading, a complex roof structure, very small PV systems or different roof orientations. In addition, a string inverter system can be supplemented by micro inverters to enable operation of occasional shaded modules.
Possible applications for micro inverters are:
The planning and installation of micro inverters is extremely simple, as they use a Plug & Play system. Therefore, on the one hand, several planning stages are significantly reduced, such as the electrical configuration of modules and strings. On the other hand, you can save considerable cabling costs during installation due to the "daisy chain" principle of serial connection.
The easiest way to take part in the Energy Transition: With this micro inverter, PV system operators have access to an easy-to-install and expandable modular solution for various applications.