Transistor-based power supply cuts electrolyzer stack energy use in simulations

Power-supply choice can affect how much electricity a hydrogen-producing electrolyzer stack uses. In a simulation of a 1 MW alkaline electrolyzer, a transistor-based converter used up to 14% less stack energy per kilogram of hydrogen than a conventional 6-pulse rectifier and up to 9% less than a 12-pulse rectifier. It delivered steadier current, reducing heat losses in the stack. When specifying a plant, compare converter options across expected operating loads and supply voltages, while treating these results as simulated rather than proven operating savings.