It simplifies the use of grid inverters in single and three-phase off-grid solar systems. The precise control means that hybrid systems can be operated with even higher energy efficiency, as the company states. The new function addresses an old problem: generally, the either/or principle applies to inverters in a hybrid system, either maximum output or none. This can lead to a system overload since loads are supplied by the battery although output from the modules would be available.
The Droop Mode function intervenes and regulates: If more energy is generated than currently required and consumed, the frequency is increased and performance is reduced in a linear fashion. An Xtender controls the StecaGrid 3000 and StecaGrid 3600 inverters, for which the Droop Mode function is intended. Consequently, loads with a lower energy demand are supplied directly by the grid inverter. With the ability to precisely draw output and control battery charging and discharging in a differentiated fashion, the entire system, including the batteries, is preserved. This has a positive effect on service life an important point for system operators. Steca says the control strategy prevents energy losses and thus significantly increases the efficiency of hybrid systems.
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