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A solar inverter takes its input from the solar Photo-Voltaic (PV) panels in the form of a DC voltage and converts it to an AC form that is usable by the consumer. Most systems today also connect to the utility grid. A net metering system monitors the user’s load requirements. Any excess power produced by the system can be delivered back to the power utility grid. The utility company will pay the user for this extra power at varying rates depending on the country or state here in the US. This payment is normally termed a “feed-in tariff”. Because the efficiency of the overall system is the most important parameter, any device that can reduce the losses in the system becomes very attractive. For this reason, Silicon Carbide Schottky diodes have already been adopted by many inverter companies to gain an efficiency advantage and reduce the payback time on the system. A typical solar inverter consists of a boost converter and inverter followed by an output filter to convert the modulated AC output to a more pure sine wave, lower in harmonic content. The PV panel voltage is boosted to a high, fixed level to get maximum usage from the PV panels at lower sunlight levels. The inverter takes this DC “link” voltage and inverts it back to a usable AC source. SiC Schottky diodes present an efficiency gain in both boost and inverter sections.
