Hydrogen Duty
Normal/peak output, operating hours, pressure/purity point, storage or process interface and redundancy.
PEM Electrolyzer Systems · Stack, BoP, Controls & Project Integration
PEM Water Electrolyzer Systems for Green Hydrogen Production
Project-specific PEM electrolyzer systems reviewed against hydrogen output and duty profile, power, pressure and gas-quality point, water and cooling, dynamic operation, balance of plant, controls, safety, FAT and site interfaces.
Performance boundary: output, pressure, purity, specific energy, turndown and life are meaningful only with the configuration, test point, water, temperature, duty, auxiliary-load boundary, analytical method and end point. DOE targets are technology guideposts—not HELE product guarantees.
System Definition
What Defines the Right PEM Electrolyzer System
Start with the hydrogen use case and complete operating profile. A nameplate kW value does not establish delivered hydrogen, pressure, gas quality, dynamic capability, availability or site fit.
Power & Operation
Grid/renewable source, AC/DC boundary, ramp, turndown, cycling, starts/stops, availability and auxiliary loads.
Water & Thermal
Feed treatment, water-quality limits, circulation, consumption, temperature, cooling duty and waste streams.
Controls & Integration
BoP, PLC/HMI, communications, detection, shutdown, ventilation, site utilities, permitting and documentation.
System Range
PEM Electrolyzer Systems We Supply
Compare the S, H, C and M series with the containerized platform by hydrogen output and project format, then open the dedicated product page for the complete configuration basis. Published values describe the stated series or reference configuration; the quotation confirms operating conditions, included equipment, acceptance evidence and site interfaces.
Configuration direction
S-Series Compact PEM Electrolyzer
Hydrogen output
0.5–1.0 Nm³/h
- Best fit
- Research, laboratory validation and pilot hydrogen projects
- Delivery format
- Compact packaged or skid direction
- Quotation must freeze
- Pressure, gas conditioning, operating profile and utilities
Configuration direction
H-Series Mid-Range PEM Electrolyzer
Reference hydrogen output
5 Nm³/h
- Best fit
- Distributed production, OEM integration and pilot scale-up
- Delivery format
- Skid or platform direction
- Quotation must freeze
- Available range, test basis, water/cooling, controls and FAT
Configuration direction
C-Series Industrial PEM Electrolyzer
Hydrogen output
6–10 Nm³/h
- Best fit
- Industrial on-site hydrogen and continuous project duty
- Delivery format
- Integrated industrial skid direction
- Quotation must freeze
- Availability, redundancy, utilities and gas delivery
Configuration direction
M-Series High-Capacity PEM Electrolyzer
Hydrogen output
10–50 Nm³/h
- Best fit
- Modular projects requiring coordinated electrical and process architecture
- Delivery format
- Multi-module system direction
- Quotation must freeze
- Module count, BoP architecture, site layout and acceptance
Configuration direction
Containerized PEM Electrolyzer
Hydrogen output
50–300 Nm³/h
- Best fit
- Outdoor, remote or packaged installations with defined site interfaces
- Delivery format
- Containerized system direction
- Quotation must freeze
- Ambient basis, ventilation, detection, access and utilities
Selection rule: hydrogen output alone does not select the system. Confirm the reference conditions, normal and peak duty, operating profile, pressure and gas-quality point, power boundary, water and cooling, installation format and downstream responsibilities.
H-Series note: 5 Nm³/h is shown as a reference configuration. The available range and performance-test basis require project confirmation.
Supply Architecture
From PEM Stack to Complete Electrolyzer System
A stack is the electrochemical conversion core. A complete system adds the functions needed to feed, cool, separate, condition, control and protect the process. The diagram explains the relationship; the quotation must still list every included and excluded item.
Electrochemical core
PEM Stack
Cells, MEA-related interfaces, porous transport/current collection, bipolar/end plates, seals, manifolds and compression structure as designed.
Review PEM Electrolyzer Stacks →
Supporting functions
Balance of Plant
Water treatment/circulation, gas-liquid separation, heat removal, rectification, instrumentation, controls, safety and optional gas conditioning.
Order-defined result
Complete System
Skid or container, utilities, interfaces, PLC/HMI, safety functions, FAT, manuals and order-defined site integration or commissioning support.
Stack evidenceBuild revision, interfaces and test conditions.
BoP evidenceP&ID, equipment list, controls and functional tests.
System evidenceDefined FAT boundary, results, documents and exceptions.
Performance Comparison
How to Read PEM Electrolyzer Performance Data
A useful comparison includes both the headline parameter and the measurement boundary behind it. Use this table to normalize supplier quotations before comparing output, pressure, gas quality, energy or dynamic operation.
| Parameter | Planning basis | Measurement boundary | Confirm in the order |
|---|---|---|---|
| Hydrogen production | Normal, peak and annual duty; no universal public value | Defined system outlet and stated reference conditions | Flow or mass basis, operating profile, stabilization and test duration |
| Outlet pressure | Configuration- and project-specific operating range | Named stack, separator, system outlet or downstream point | Normal/maximum pressure, differential pressure and compressor boundary |
| Hydrogen quality | Order-specific purity, dew point and impurity limits | Named sampling point before or after conditioning | Separator, dryer/purifier scope, method, calibration and off-spec handling |
| Energy consumption | Stack DC or complete-system AC basis | Declared electrical meter and hydrogen measurement boundary | Rectifier and auxiliary loads, load point, reference conditions and duration |
| Dynamic operation | Defined turndown, ramp, standby and start/stop sequence | Stack, rectifier, BoP and control-system boundary | Renewable profile, thermal state, acceptance cycle and protection limits |
| Availability and life | Evidence-based project basis rather than an unconditional claim | Specified stack/system configuration and operating history | Maintenance, replacement, degradation/end-of-life method and warranty exclusions |
Important: a public family name or reference configuration is not a guaranteed operating envelope. Final values belong in the quotation, approved datasheet and FAT basis for the selected configuration.
Project Inputs
What We Need to Review Your PEM Electrolyzer Project
Unknown inputs can remain open. They should not be replaced by generic model, purity, pressure or life claims.
Production Basis
Hydrogen flow/mass, normal and peak duty, hours, availability, turndown, ramp and cycling.
Gas Specification
Pressure and sampling point, purity, dew point, oxygen/crossover limits, drying/purification and storage/use boundary.
Utilities & Site
Electrical source, water, cooling, drainage, ventilation, ambient, altitude, layout, hazardous-area and communications.
Compliance & Delivery
Jurisdiction, applicable standards, certification route, FAT/witness, documents, Incoterm, schedule and installation scope.
Manufacturing & Supply Scope
What HELE Can Configure, Integrate and Document
HELE can review the project duty and coordinate an order-specific PEM electrolyzer supply around the approved performance basis, equipment list and responsibility matrix. The quotation identifies what is included, optional or excluded, and the signed order documents define the final supply boundary.
01 · Requirement Review
Freeze the Design Basis
Review hydrogen output and reference conditions, gas-quality point, delivery pressure, operating profile, power, water, cooling and site constraints.
Typical output: design-basis summary and open-item list for quotation.
02 · System Configuration
Match the Stack and Process Route
Coordinate stack or module selection with the rectifier, water circulation, gas-liquid separation, cooling and gas-conditioning boundary.
Typical output: proposed configuration and preliminary supply-scope schedule.
03 · Skid & BoP Integration
Coordinate Equipment and Interfaces
Review water, hydrogen, oxygen, cooling, drain, vent, purge, relief and mechanical interfaces against the agreed package boundary.
Typical output: agreed PFD/P&ID, GA or interface documents when included.
04 · Electrical & Controls
Define Power, Control and Safety Logic
Coordinate the rectifier boundary, PLC/HMI, instruments, communications, permissives, alarms, shutdowns and detection interfaces specified for the package.
Typical output: interface list, control narrative or I/O documentation as agreed.
05 · FAT & Evidence
Test Against an Approved Protocol
Perform only the agreed leak, pressure, functional, interlock and performance checks under documented test conditions and measurement boundaries.
Typical output: FAT, inspection and release records listed in the order.
06 · Delivery Support
Close the Handover Boundary
Align manuals, drawings, certificates, preservation, packing, recommended spares and any remote or site-support option before release.
Typical output: approved document register and handover package.
Responsibility Boundary
Confirm These Items in the Quotation
A packaged electrolyzer image does not prove that every downstream or site item is included. Mark each item as included, optional, customer-supplied or excluded in the approved responsibility matrix.
- Stack source, configuration, guaranteed operating point and warranty boundary
- Water treatment, cooling, rectifier, gas separation and purification equipment
- Hydrogen compression, storage, dispensing and downstream process connection
- Civil works, building ventilation, hazardous-area review and local permitting
- Site installation, commissioning, performance test and operator training
Order rule: only the signed quotation, approved equipment list, drawings and responsibility matrix define the final HELE supply.
Applications
PEM Electrolyzer Applications
Application names route the inquiry; actual configuration depends on production profile, gas delivery, utilities, site and downstream integration.
Industrial On-Site Hydrogen
Define production rate and profile, pressure/purity point, storage/use interface, utilities, redundancy and permitting.
Renewable Energy Integration
Provide generation/load profile, rectifier/DC interface, ramp and cycling, curtailment strategy, availability and degradation basis.
Hydrogen Refueling Support
Separate electrolyzer production from drying, compression, storage, cooling and dispensing responsibilities.
Research & Pilot Production
Control test objective, data acquisition, safe installation, sample points, operating envelope and scale-up boundary.
Testing & Evidence
PEM Electrolyzer Testing, FAT & Project Documentation
FAT scope must state the configuration, utilities, measurement points, instruments, duration, acceptance and deviations. A witnessed function test is not automatically a long-duration performance or field-life demonstration.
| Control | Order definition | Evidence when included |
|---|---|---|
| Hydrogen duty | Normal/peak output, operating hours, turndown, ramp, starts/stops and availability | Sizing sheet and order-specific performance/FAT basis |
| Electrical | AC input or DC boundary, rated power/current/voltage, rectifier and auxiliary loads | Electrical drawings and measured FAT data |
| Gas delivery | Pressure and measurement point, purity, dew point, separator/dryer/purifier and downstream boundary | Defined sampling and analytical method |
| Water & thermal | Feed treatment, water-quality limits, consumption, circulation, temperature and cooling duty | P&ID, water specification and operating/manual limits |
| BoP & controls | Pumps, separators, heat exchangers, valves, instruments, PLC/HMI, communications and alarms | I/O list, cause-and-effect and functional test |
| Safety & documents | Relief/vent, detection, ventilation, shutdown, applicable standards, manuals and data book | Approved safety/FAT/document package |
Pressure / Leak
Medium, boundary, pressure, duration, temperature, instrument and acceptance.
Performance
Hydrogen, power, water, temperature, pressure, auxiliaries, duration and normalization.
Gas Quality
Sampling point, conditioning state, method, calibration, purity/dew point and limits.
Safety / Controls
Interlocks, alarms, shutdown, detection, relief/vent, communications and recovery.
Manufacturing & Integration
From Component Preparation to Final Packing
The route shown is an overview. Actual ownership of component manufacture, stack build, system integration and testing must match the approved supply chain and order records.
1. Component Preparation
Confirm approved components, material/lot identity, cleanliness, handling and build documentation.
2. PEM Stack Assembly
Control stack build revision, interfaces, compression/sealing route and in-process inspection.
3. System Integration
Integrate water, gas, cooling, power, controls, instrumentation and safety functions to the approved P&ID and drawings.
4. Final Test & Release
Complete the agreed FAT, leak/pressure, functional, documentation, preservation and packing release.
Before Requesting a Quote
Define Hydrogen Duty and System Boundary Before Quotation
PEM electrolyzer comparisons must separate stack performance from packaged-system performance and use the same hydrogen, purity, pressure, operating profile, utilities, safety and acceptance basis.
- Define hydrogen flow, reference conditions, purity and delivery pressure.
- State operating profile, turndown, starts, ramping and redundancy.
- Provide feedwater, cooling, power quality and site utility conditions.
- Separate stack, rectifier, gas treatment, controls and balance-of-plant scope.
- Align FAT, performance guarantees, codes, documents and commissioning responsibility.
Do not release a purchase order with only:
- Hydrogen flow with no normal or standard reference conditions
- Stack efficiency presented as packaged-system efficiency
- Purity stated without a measurement point or method
- Pressure stated without the agreed delivery boundary
- Auxiliaries, safety systems and commissioning exclusions left unnoticed
FAQ
PEM Electrolyzer FAQ
What is included in a PEM electrolyzer system quotation?
The quotation should identify stack, rectifier or DC supply, water treatment and circulation, gas-liquid separation, drying or purification where included, cooling, controls, instrumentation, safety systems, skid or container, tests, documents and excluded balance-of-plant items.
Can hydrogen output be compared without test conditions?
No. State normal/rated power and current, operating temperature and pressure, water quality, measurement point, reference conditions, gas purity or dew-point method, auxiliary loads and test duration.
Is stack efficiency the same as system efficiency?
No. Stack voltage or specific energy excludes some or all balance-of-plant loads. System energy must state rectifier, pumps, cooling, drying, controls and measurement boundary.
Does outlet pressure describe the entire hydrogen-delivery package?
No. Define pressure at the stack or system test point, gas-liquid separation, drying/purification, relief and downstream compression or storage responsibility.
What water information is required?
State feed-water source and treatment, conductivity/resistivity, TOC and ionic limits where applicable, temperature, flow, consumption, storage, sampling and monitoring.
Which standard should be referenced for electrolyzer safety?
ISO 22734-1:2025 is a current safety standard for hydrogen generators using water electrolysis. Applicability, edition, certification route and project/jurisdiction requirements must be confirmed for the ordered configuration.
Inside HELE Titanium
Inside Our Manufacturing & Quality System
A visual overview of the assembly, system-integration, inspection, documentation and release environment. The exact manufacturing ownership, tests and records for an order are confirmed in the quotation, approved quality plan and supply-chain documentation.
PEM Electrolyzer Project Review
Request a PEM Electrolyzer Technical Quote
Send the project information already available. Unknown items can remain open for review rather than being replaced by an unconditioned model, pressure, purity or life claim.
- ✓ Hydrogen duty and system-sizing review
- ✓ Stack, BoP and site-interface checklist
- ✓ FAT, safety and document boundary
- ✓ Commercial assumptions and exclusions