DC power and temperature control
Power and thermal management sized for the operating range
Who it is for
A 2 kW stack for system integrators building their own BoP, with measured data for technical review
HXS-2 is a stack for system integrators and customers designing their own power, circulation, separation and safety systems. Performance evidence, interfaces and service conditions must be reviewed together.
Choose this product when
- You are developing your own BoP or system and need a validated stack
- You need a spare or replacement stack for an existing system
- You want to evaluate performance and durability at stack level yourself
INTEGRATION BOUNDARY
The BoP before and after the stack remains in your integration scope
HXS-2 includes the stack, interface specifications and operating guidance; the customer designs the power, circulation, separation and safety systems.
HXS-2
23-cell stack with interfaces and operating guidance
Circulation, separation and safety
Electrolyte loop, gas-liquid separation and site safety systems
Included supply scope
- Compression-assembled stack and product-specific connection specifications
- Recommended operating conditions and available performance data
- Exterior/enclosure-only STEP model on request (internal parts and flow fields excluded)
Customer preparation
- Electrolyte circulation loop and pump (standard flow 4 L/min)
- DC power supply sized for the operating current range
- Temperature control, gas and liquid separation, hydrogen safety equipment
- Management of the anode to cathode pressure difference (a larger difference increases crossover)
Test results
23-cell full stack: performance curves and cell voltages
The label on each chart says whether it is measured, test or design-target data. Test conditions are in each chart caption.
MEASURED01
The ambient and pressurized curves show full-stack voltage across current.
i-V curve · 23-cell full stack · 0.1 M KOH · 50 °C · ambient/pressurized
MEASURED02
Individual cell voltages show the uniformity across all 23 cells.
23-cell voltage uniformity (avg 1.689 V · σ 0.010 V)
Customers
HXS-2 in customer projects
These records describe the selection purpose and application context, not customer-verified performance.
A cell development engineer chose it as the platform for their own materials
It was brought in as the stack into which their in-house cell development work would be assembled. That is why what they checked before ordering was not performance figures but the dimensions of each component.
View application context →
A stack you can load your own catalyst and membrane into
They were looking for an AEM electrolyzer in the 100 to 500 cm² range for a pilot test setup. The purpose was not finished hydrogen production but evaluating catalysts and membranes they develop themselves.
View application context →Specifications
HXS-2 specifications and supply terms
The specification table, support terms and review documents.
Complete product specifications19 items
| H₂ production | 500 L/h · 1 kg/day (at rated 50 A) |
|---|---|
| Efficiency (HHV) | 90.0% (BOL · 0.1 M KOH · 50 °C · ambient pressure) · 44 kWh/kg-H₂ |
| Long-run validation | More than 3,000 hours of cumulative operation (23 cells) · long-run data and test conditions in the durability note |
| Rated operating condition | 0.1 M KOH · 50 °C (adjustable) |
| Operating temperature | Up to 80 °C |
| Energy use | 2 kW (at 50 A) |
| Water consumption | 420 mL/h (50 A) |
| Number of cells | 23 |
| Active area | 100 cm² (anode) / 79 cm² (cathode) |
| Dimensions | 190 × 198 × 215 mm |
| Weight | 19 kg |
| Structure | NiFe anode · Pt/C or PtRu/C cathode · AEM |
| Fluid ports | KOH IN 3/8″ PEEK tube · O₂+electrolyte OUT 3/8″ PEEK tube · H₂ two ports 1/4″ double-ferrule |
| DC terminals | M6 · torque 4–6 N·m |
| External circulation | 4 L/min (standard) |
| Instrument calibration | Flow and gas analysers calibrated under KOLAS |
| End plate | SUS316L |
| Bipolar plate | Nickel-based metallic plate |
| Material change | Yes · we confirm the operating window and validation scope together |
How to cite in a paper1 item
Use the line below in the Methods section when reporting the material source.
AEM water electrolysis stack, 23 cells, 2 kW (HXS-2, HydroXpand Inc., Republic of Korea)- Specification
- 23 cells, 100 cm² anode / 79 cm² cathode active area, 500 L/h at 50 A
- Test condition
- 0.1 M KOH, 50 °C, ambient pressure
Ask [email protected] if the lot number is required.
Support, lead time and commercial terms3 items
Service & reassembly
Disassembly and reassembly require our dedicated gaskets and a hydraulic press, so conditions are agreed with us in advance. Return service can replace only the MEA and reuse the hardware; the service scope and terms are fixed in the quotation.
Lead time & status
Available · 4 weeks from PO acceptance
Commercial terms & origin
EXW basis; DAP and other terms by agreement. Country of origin is the Republic of Korea, with certificate of origin provided.
Pricing depends on quantity and Incoterms, so it is issued as a quotation. Before asking for one, compare five years of buying cylinders against making the same hydrogen on site.
Cost vs cylinders calculatorBefore you order
HXS-2: questions before you order
Minimum order, lead time, formats and how pricing works. The full FAQ covers operating and integration questions.
How do I buy the HXS-2?
HydroXpand sells it directly. Send the cell count (23 or 5 cells), quantity and your BoP configuration through the enquiry form or to [email protected]; we return a quotation with price, lead time and Incoterms, and the lead time counts from the day we accept your purchase order.
What is the lead time?
It ships four weeks from PO acceptance. Besides the standard 23-cell, 2 kW configuration, a five-cell configuration is supplied on the same terms.
What do I need to run the bare stack on my own balance of plant?
A bare stack has no PLC or communications interface, so your controller handles electrolyte circulation (0.1 M KOH, 4 L/min, 50 °C as the reference), power, gas separation and safety interlocks. The 10 barg figure is the hydrogen-side maximum operating pressure, not an allowable differential pressure. The loop schematic, port specifications and minimum instrumentation list are published in the stack integration guide.
What about warranty and service?
A bare stack is supplied against conformity to specification and freedom from manufacturing defects at acceptance rather than a time-based warranty. Service is a refurbishment: return the stack, we replace the MEA only and the hardware is reused. Performance and leak-tightness after the customer has opened the stack are not covered.
How much does it cost?
Price depends on quantity and Incoterms, so it is issued as a quotation. Before asking for one you can compare five years of buying cylinders against making the hydrogen on site with the cost calculator.
What are the commercial terms and the country of origin?
EXW is the base term and other Incoterms such as DAP are available. The country of origin is the Republic of Korea; a certificate of origin is provided, so FTA preference may apply in countries that have an FTA with Korea.