Controller of photovoltaic water heater

The controller of the photovoltaic water heater comprises a shell, a mode switching assembly and a temperature adjusting assembly are arranged on the shell, and the mode switching assembly is used for switching among a photovoltaic heating mode, a mains supply instant heating mode and an intelligent heating mode; the temperature adjusting assembly is used for setting and displaying the temperature; a photovoltaic heating assembly, a mains supply instant heating assembly and an intelligent heating assembly are arranged in a shell, the photovoltaic heating assembly is an MOS tube or a solid-state relay, the mains supply instant heating assembly is an electromagnetic relay, photovoltaic electric energy can be utilized to the maximum extent on the premise that individual requirements are met, and the overall utilization efficiency of the photovoltaic electric energy is improved; and meanwhile, a contactless control mode is adopted, so that the problem of direct-current arc discharge is radically eradicated, and t