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HXS-2 — a 23-cell, 2 kW AEM water electrolysis stack for system integrators

A sealed stack assembly with defined interfaces for customers who design their own balance of plant.

HXS-2 is a 23-cell anion exchange membrane (AEM) electrolyser stack rated at 480 NL/h of hydrogen, approximately 1 kg per day, at 50 A. It is supplied with defined mechanical, fluid and electrical interfaces for research teams, system developers and OEMs who build their own power conversion, electrolyte circulation, gas separation and safety systems. Available to order; shipping four weeks from PO acceptance.

480 NL/h
Hydrogen production
Approximately 1 kg/day at 50 A

2 kW / 50 A
Rated stack reference
23 cells

90.0% HHV
Beginning-of-life efficiency
0.1 M KOH · 50 °C · ambient pressure

>3,000 h
Cumulative operation on 23 cells
Long-run data in the durability note

01 — A clear system boundary

Standard supply

HXS-2 23-cell AEM stack assembly with the stated mechanical, fluid and electrical interfaces.

Customer system

Power conversion, electrolyte circulation, cooling, gas treatment, sensing, safety and control.

Integration review

Output, duty cycle, pressure, cooling, gas treatment and interfaces are reviewed before quotation.

02 — Evidence that stays with its test conditions

Rated output

480 NL/h of hydrogen, approximately 1 kg/day, at 50 A.

Energy use

2 kW at 50 A; 44 kWh/kg-H₂ at the stack boundary.

Beginning of life

90.0% HHV at 0.1 M KOH, 50 °C and ambient pressure.

Long-run validation

More than 3,000 hours of cumulative operation on 23 cells; long-run data and test conditions are published in the durability note.

Operating condition

0.1 M KOH, 50 °C (adjustable); up to 80 °C.

Hydrogen pressure

Up to 10 barg option on the H₂ side.

Protocol note: beginning-of-life efficiency and long-run durability were measured under different conditions and must not be combined into one operating point. Test conditions are stated next to every figure on the product page and datasheet.

03 — Stack data

Cells / active area

23 cells; 100 cm² anode / 79 cm² cathode.

Structure

NiFe anode · Pt/C or PtRu/C cathode · AEM.

Water consumption

420 mL/h at 50 A.

Size / weight

190 × 198 × 215 mm / 19 kg.

Fluid ports

KOH in 3/8″ PEEK tube; O₂ + electrolyte out 3/8″ PEEK tube; H₂ out 1/4″ double-ferrule.

04 — Where HXS-2 fits best

Balance-of-plant development around a 2 kW-class stack

Long-duration validation and integration work

Laboratory-to-pilot projects that need a defined stack boundary

Building blocks for parallel multi-stack systems

05 — What to include in an RFQ

Required output and duty cycle

DC power, electrolyte circulation and cooling concept

Pressure, gas treatment and safety architecture

Quantity and delivery schedule

Measured values are stated with their conditions. HydroXpand will identify which evidence applies to the proposed configuration before quotation.

2 kW AEM Water Electrolysis Stack – HXS-2 (23 cells, 1 kg H₂/day)