AEM Flex 120: The electrolyser fitting your production needs
Our AEM Flex 120 enables your streamlined launch of green hydrogen in pilots ranging from industrial process heat to refuelling.
Flexible configuration from 70kW to 480kW guarantees a match with your budget and hydrogen production requirements. The modular design ensures reactivity to intermittent renewable energy, built-in redundancy and freedom to scale when you need it!
What is Enapter’s AEM technology, and how does it work?
Enapter’s core product is the standardised and stackable anion exchange membrane (AEM) electrolyser.
Electrolysers use electricity to split water (H2O) into hydrogen (H2) and oxygen (O2) through an electro-chemical reaction. The stack is the electrolyser’s heart and comprises multiple cells connected in series in a bipolar design. Enapter’s unique technology is the design and operation of these cells, consisting of a membrane electrode assemble (MEA), made from a polymeric AEM and specially designed low-cost electrodes. The anodic half-cell is filled with dilute KOH (alkaline) electrolyte solution; the cathodic half-cell has no liquid and produces hydrogen from water permeating the membrane from the anodic half-cell. Oxygen is evolved from the anodic side and transported out from the stack through the circulating electrolyte. The hydrogen is produced under pressure (typically 35 barg) and already extremely dry and pure (about 99.9%). Using Enapter’s ancillary dryer module, hydrogen is delivered at 99.999% purity.
The modular design – paired with advanced software integration – allows set up in minutes and remote control and management. Stack this electrolyser to achieve the required hydrogen flowrate.
The AEM stack module
The AEM stack module is the centerpiece of the product platform, minimum modular unit (MMU). It is equipped with the necessary sensorsto measure flow speeds,
temperatures and pressures. This enables detailed and granular monitoring of the state of health of each stack, as well as optimization of overall system management to balance running times and schedule preemptive
maintenance activities. Gas and water connectors are easily accessible at the front. Electric connectors are in the back.
What is the difference between the Proton Exchange Membrane (PEM) technology and the Anion Exchange Membrane (AEM) technology, and what are the advantages of AEM?
Proton exchange membrane electrolysers (PEM) use a semipermeable membrane made from a solid polymer and designed to conduct protons. While PEM electrolysers provide flexibility, fast response time, and high current density, the widespread commercialisation remains a challenge primarily due to the cost of the materials required to achieve long lifetimes and performance. Specifically, the highly acidic and corrosive operating environment of the PEM electrolyser cells calls for expensive noble metal catalyst materials (iridium, platinum) and large amounts of costly titanium. This poses a challenge to the scalability of PEM electrolysers.
The anion exchange membrane electrolysers use a semipermeable membrane designed to conduct anions. They are a viable alternative to PEM with all the same strengths and several key advantages that lead to lower cost. Due to the less corrosive nature of the environment, steel can be used instead of titanium for the bipolar plates. Furthermore, AEM electrolysers can tolerate a lower degree of water purity, which reduces the input water system’s complexity and allows filtered rain and tap water.
AEM Flex 120 green hydrogen applications
- Extremely high availability and built-in redundancy
- Automated & remote operation with our EMS
- Ideal for on-site hydrogen production
- Low maintenance requirements
Hydrogen outlet temperature:
5 -55 °C
Hydrogen output purity:
99.95% in molar fraction,
equals dew point of -30 °C
lmpurities: H₂O < 500 ppm, O₂ < 5 ppm
Hydrogen purity with optional dryer:
99.999% in molar fraction,
equals dew point of -65 °C
lmpurities: H₂O < 5 ppm, O₂ < 5 ppm
up to 35 barg
Hydrogen nominal flow:
Netvolume flow rate
120 kW Beginning of life (BOL)
Near end of life (EOL)
3 x 400VAC, ±10 %
50/60 Hz, ±10 %; THD < 5%
Water nominal consumption:
23 L/h Purified water
L: 3.2 m x W: 2.5 m x H: 3 m
Water inlet temperature:
5 -55 °C
1- 4 barg
Water inlet quality:
Minimum ASTM D1193-06 Type IV or recommended Type II or Type III¹
12 %-100 %
Of nominal H₂ flowrate
8:1 Maximum flow/Minimum flow
Specific power consumption (Efficiency) +:
4.8 kWh/Nm³ H₂
lncluding all utilities inside the battery limits of the AEM Multicore (at BOL)
Hot startup time:
0 – 100% in 100 seconds
Electrolyte is at min. 35 °C
Cold startup time:
0 – 100% in 30 minutes
Assuming 5 °C ambient temperature
Shut down time:
100 – 0% in 3 minutes
Normal, gradual shut down
Hot standby power consumption:
20 kW Max.
Stacks are hydrated and electrolyte circulates at min. temperature (35 °C)
Type of installation:
5 – 35 °C
Process heat output:
BOL; ~ 50 °C
Fits inside 20 ft high cube container
~ 3,700 kg
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Send us a short message, if you are interested in this module and we’ll get back to you as soon as possible.