Analysis of the Safety Structure of Water Heaters Powered by Dual Power Supplies - Photovoltaic Power Supply and Mains Power Supply

With the development of water heater technology, many dual-power water heaters that can be powered by both photovoltaic power and the main power supply have already appeared on the market. This article mainly discusses the security structure of a water heater powered by photovoltaic supply and mains supply. It should consider the safety isolation between the photovoltaic supply and the live parts of mains supply circuit when the photovoltaic supply is safety extra-low voltage. Cautions in design of control circuit of dual power supply water heater. The working modes of the dual-power water heater.