Under the goal of“dual carbon”, the high penetration of renewable energy generation brings about critical challenges such as integration difficulties and strong power fluctuations, which urgently require solutions. Electrolyzer loads with adjustable capacity can achieve bidirectional matching with renewable energy output. Meanwhile, off-grid hydrogen production yields green hydrogen with zero carbon emissions throughout its life, serving as a key driver for achieving the“dual carbon”strategy. Therefore, an optimal capacity configuration method for an off-grid wind-solar-storage hydrogen production system considering hybrid electrolyzers is proposed. First, modeling and analysis are conducted for key components on the power supply side and hydrogen production side of the system. Second, with the objective of minimizing hydrogen production costs, an optimization model for the off-grid wind-solar-storage hydrogen production system is constructed. Finally, a case study is performed based on wind and PV output data from a region in Northwest China. Simulation results demonstrate that the coordinated operation strategy of hybrid electrolyzers, compared to a single electrolyzer, can reduce hydrogen production costs, decrease the start-stop cycles of electrolyzers, and mitigate renewable energy curtailment, thereby verifying the feasibility and effectiveness of the proposed model and method.