Inverter circuit and method of operation

Abstract

An inverter includes a first switch to disconnect an output of the inverter from any device connected thereto; a second switch to disconnect and connect an input of the inverter from direct current fed to the inverter; a discharge device to discharge any residual charge on a large capacitor; a voltage sensor to measure input DC voltage to the inverter; a current sensor to measure input DC current to the inverter; and a data recorder to provide a current voltage trace to provide a current-voltage curve tracer to provide current-voltage curve data that may then be used to calibrate a maximum power point tracker or alternatively sense array shading.

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