# Green Hydrogen Production--Fidelity in Simulation Models for Technical-Economic Analysis
## 5 Conclusions  
This experimental study demonstrated the impact of different electrolytes on hydrogen production efficiency, focusing particularly on sulfuric acid (H\({}_{2}\)SO\({}_{4}\)) at 37% concentration. Electrochemical testing, conducted in the Laboratory of the Faculty of Chemical Sciences, provided a comparative analysis using electrodes of 50 cm\({}^{2}\) and 100 cm\({}^{2}\), showing that sulfuric acid significantly enhances current density, thus optimizing hydrogen generation. The results indicate that higher electrode surface areas yield increased hydrogen output. The production of green hydrogen based on a micro-grid with PV system support and ESS batteries allows for improving sustainability with minimum consumption from the electric grid. This article presents a technical-economic study based on a simulation model approach. During the electrolyzer's operation, real-time simulation is necessary to de-risk overall technology development as we move closer to system deployment. In this paper, the fidelity of a hydrogen production model is analyzed under different parameterizations in the input variables. Energy management for green hydrogen production in a micro-grid was presented as a case study. In this case, the electrolyzer's use has been optimized for 16 operating hours per day. Consequently, the micro-grid's 15 kW PV system, together with the ESS batteries, has covered the electrolyzer's annual demand (13,766.4 kWh/year). Despite having high PV generation, energy is required from the electrical grid for two months with low energy demand. The current simulation fidelity proposal for hydrogen yields a value of 64 kWh/kg of hydrogen. Comparing this with the values reported by IRENA in 2023, which range from 46 to 66 kWh/kg, it is evident that our results fall within this established range. In this case study conducted in the city of Cuenca, Ecuador, the subsidized electricity cost is approximately 9.20 cUSD/kWh. However, if the actual cost of electricity, which is 16.2 cUSD/kWh, were considered, the cost of producing one kilogram of hydrogen would increase significantly, from 5.76 USD/kg to 10.36 USD/kg. Finally, using the methane reforming method for hydrogen production, 924 kWh is required to obtain 0.287 kg of hydrogen per day. In contrast, using the PV, ESS, and grid strategy, only 64 kWh is needed, which in Ecuador would represent a cost of USD 10.36/kg in our proposal, compared to USD 134/kg for the traditional method. A.C.: Visualization, Supervision, Software, Resources, Writing--Original Draft, Writing--Review and Editing, Methodology. L.I.M.-A. : Resources, Writing--Original Draft, Methodology, Investigation, Formal Analysis, Data Curation, Writing--Review and Editing, Validation. D.B. : Visualization, Supervision, Software, Resources, Writing--Original Draft, Writing--Review and Editing, Project Administration, Methodology. D.O.-C.: Resources, Writing--Original Draft, Methodology, Investigation, Formal Analysis, Data Curation, Writing--Review and Editing, Validation. M.T.-V.: Supervision, Software, Resources, Writing--Original Draft, Project Administration, Methodology, Investigation, Funding Acquisition, Visualization. W.K.M. : Resources, Writing--Original Draft, Methodology, Investigation, Formal Analysis, Data Curation, Writing--Review and Editing, Validation. F.J.: Project Administration, Methodology, Investigation, Funding Acquisition, Formal Analysis, Data Curation, Conceptualization, Visualization. All authors have read and agreed to the published version of the manuscript. **Acknowledgments:** The authors wish to thank the Spanish Ministry of Science and Innovation and European Union NextGenerationEU/PRTR, under the research Project \"Desarrollo de herramientas computacionales para microrredes multi-energia con vectores de electricidad, hidrogeno y gas\" (TED2021-129631B-C31).