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In an off grid solar power system, the role of the off grid solar inverter charger is to convert the DC power converted by the photovoltaic panel and stored in the battery into AC power for use by the AC load. The full name of the solar controller is the solar charge and discharge controller. Its function is to control the multi-channel photovoltaic panel to charge the battery and control the battery to supply power to the solar off-grid inverter. The functions of the two are completely different.