Abstract: For the energy storage plan of off grid new energy hydrogen production systems, based on the requirements of operation, the minimum energy storage scale configuration was optimized. Firstly, for off grid new energy hydrogen production systems, considering the application of Markov chain transition matrix, a new energy curve generation method was proposed based on k-Shape clustering algorithm and optimization indicators. Secondly, with the goal of maximizing the hydrogen production, a storage optimization model for off grid new energy hydrogen production systems was proposed by fully considering the new energy output curve, basic response characteristics of electrolysis tanks, and energy storage response characteristics. And then, combining the new energy curve and energy storage optimization model and and considering the operating indicators of the hydrogen production system, a production simulation method was adopted to propose an energy storage scale correction method based on continuous production simulation. Finally, a multi-year case study was conducted on an off grid hydrogen production system with 84 MW photovoltaic power, 30 MW wind power, and 14 hydrogen production devices with 1 000 m³ of per device. Results showed that the system could achieve good operational performance when equipped with 4.973 MW/4.973 MW·h energy storage, which verifying the rationality and effectiveness of this method and achieving a balance between operational requirements and economy in the process of energy storage scale configuration.