Electrolyzer Sizing Calculator

Size a water electrolyzer for hydrogen production based on daily demand, efficiency, and operating hours. Estimates electricity cost and water consumption.

Inputs

Hydrogen Demand (kg/day)

Electricity Price ($/kWh)

Electrolyzer Efficiency (%)

Operating Hours per Day

Tab to move between fields

Results

Electrolyzer Capacity

297.59 kW

≈ 20 homes' peak draw

Daily Electricity4,761.43 kWh

Annual Electricity Cost$104,275.32

Daily Water Consumption900 liters

Estimated System Cost$357,108.00

How to Use This Calculator

Enter Hydrogen Demand (kg/day), Electricity Price ($/kWh), and Electrolyzer Efficiency (%).
Set Operating Hours per Day.
Review the Electrolyzer Capacity (kW) result.
Use Daily Electricity (kWh) and Annual Electricity Cost ($) to inform your decision.
Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Electrolyzer Efficiency (%)

Electrolyzer Efficiency (%)	Electrolyzer Capacity
55%	378.75 kW
66%	315.63 kW
79%	263.69 kW
91%	228.92 kW

What each input means

Hydrogen Demand (kg/day): Daily hydrogen production requirement in kilograms.
Electricity Price ($/kWh): Cost of electricity per kWh. Renewable PPAs often $0.03-0.08/kWh.
Electrolyzer Efficiency (%): Energy conversion efficiency. PEM: 60-80%, Alkaline: 65-75%, SOEC: 80-90%.
Operating Hours per Day: Daily operating hours. 24h for baseload, 8-16h for renewable-powered.

What each result means

Estimated System Cost: Based on ~$1,200/kW for PEM electrolyzers.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Hydrogen Demand (kg/day) = 100, Electricity Price ($/kWh) = 0.06, Electrolyzer Efficiency (%) = 70, Operating Hours per Day = 16 = 4 input(s) provided
Calculate Electrolyzer Capacity
Electrolyzer Capacity
297.59 = 297.59
Calculate Daily Electricity
Daily Electricity
4761.43 = 4761.43
Calculate Annual Electricity Cost
Annual Electricity Cost
104275.32 = $104,275.32