Calculators
Electrolyzer Stack Energy Balance
Stack power, hydrogen output, specific energy consumption, HHV/LHV efficiency, and heat rejection for a PEM or alkaline water electrolyzer stack. Rolls up into a first-order LCOH estimate from CAPEX, capacity factor, electricity cost, and O&M.
Validated: at Vcell = 1.9 V, SEC ≈ 50.5 kWh/kg (within IRENA 2020 published PEM range 50–55 kWh/kg). References: IRENA (2020) Green Hydrogen Cost Reduction; Grigoriev et al., Int. J. Hydrogen Energy 45(49), 2020; DOE H2 Shot (2023). LCOH is a first-order estimate — does not include stack replacement, financing cost, or BOP capex. For more context see the Electrolyzer LCOH Guide in the Knowledge Base.
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