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The inverter is a positive energy battery that converts direct current into alternating current. When the battery is loaded with direct current power, the inverter is essential for independent operation of the inverter and grid connected inverter. The inverter is used for independent operation of the solar cell power generation system to supply power to independent loads. Grid connected inverters can be divided into square wave inverters and sine wave inverters for grid connected solar cell power generation systems. The square wave inverter has a simple circuit, low cost, but large harmonics, and is generally used in systems with several hundred watts or less and low requirements for harmonics. Sine wave inverters are expensive, but they can be used for various loads.