System and method to control hydrogen-to-oxygen ratio in an anode side at turndown in electrolyzers

An electrolysis system comprising:

• at least two electrolyzer stacks, each of the at least two electrolyzer stacks having an anode side configured to provide an anode-side gas having a hydrogen-to-oxygen (HTO) ratio,
• an oxygen separator tank fluidically coupled to an outlet of each of the anode sides with a respective oxygen conduit, and
• an anode-side dilution system that is configured to be transitioned between a closed-monitor state and an open-dilution state, the anode-side dilution system includes a diluent gas tank storing a diluent gas and fluidically coupled to the outlet of each anode side with a respective diluent-delivery conduit between the diluent gas tank and the respective oxygen conduit, a primary HTO sensor configured to measure the HTO ratio of the anode-side gas from the at least two electrolyzer stacks downstream of the oxygen separator tank, and a respective valve coupled to each of the diluent-delivery conduits to selectively change the anode-side dilution system between the closed-monitor state and the open-dilution state.