Enapter Electrolyser 4.1 User manual

Battery Limits
Electrolyser 4.1
Please study these battery limits carefully before unpacking, installing, and operating the device.
Rev. 01 –October 2023

VERSION
DOCUMENT TITLE
RELEASE DATE
01
EL4.1 –Battery Limits
2023-10-06
EL4.1 –Battery Limits –Rev.01 –October 2023I
CHANGE HISTORY
A black triangle on the left side of the page indicates changes since the last revision. The number inside
the triangle indicates the revision which includes the changes the first time. The product and
specifications are subject to change without notice.
Rev.
Status
Date
Revision memo
Created/changed by
00
IFP
01/10/2023
First version
Philipp Endres
01
IFP
06/10/2023
Edited/Proofread for clarity
Beth De Felici

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EL4.1 –Battery Limits –Rev.01 –October 2023II
PREFACE
Thank you for choosing Enapter. Please study these battery limits carefully before unpacking, installing,
and operating the device.
If you have any further questions, please contact the Enapter customer support team. Quote the device
serial number and hardware number on the back of the device to help identify your product quickly.
ENAPTER SRL
Headquarter: Via di Lavoria 56/G
56040 Crespina (PI) –Italy
T.: [phone]
E.: sup[email protected]
Website: www.enapter.com
VAT no. 13404981006
SCOPE OF THE DOCUMENT
This document must be read and understood in addition to the owner’s manual which is also available
on handbook.enapter.com. Reading this document does not replace the thorough studying of the
owner’s manual.
The purpose of this document is to define and describe the battery limits of the Electrolyser 4.1. It
illustrates the physical interface ports of the device to allow the operator to integrate it with the other
equipment that composes their system.
This document applies to all Enapter devices with the following product code: ELE4105XXXXXSV00
APPROVED USE
This device must only be operated for its intended purpose according to the specifications and
instructions provided in the owner’s manual. This document is intended as ancillary information only.
Keep this document in a safe place and readily available. It is the operator’s responsibility to ensure
that an installed device is always in proper condition. Please observe any additional local requirements
applicable to the installation and operation of the device.
Improper use of the device can result in serious injuries and damage to the
environment.
Always use the device according to the specifications described in this document.
Ensure that this document is always accessible.
Make sure you have read and understood this document in its entirety.
Comply with all safety instructions and warnings.

VERSION
DOCUMENT TITLE
RELEASE DATE
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EL4.1 –Battery Limits
2023-10-06
EL4.1 –Battery Limits –Rev.01 –October 2023III
Store this document and other documentation in a safe and accessible place and
pass them on to future owners and operators of the device.
Comply with all relevant local safety guidelines, rules, directives, and regulations.
Enapter does not guarantee efficiency, safety, and functionality in case of
modifications not described in this document.
Enapter is not responsible for any damage caused by the device or to the device
based on improper operation or setup.
TERMS
The following terms are used in this document:
Device: Device means the unit, including its hardware and software as well as contained materials
and substances.
System: System means the combination of devices, tubes, pipes, and equipment from Enapter and
other manufacturers which are connected physically, logically, or in any other way to produce,
store, use, transfer, or convert hydrogen and related substances.
Operator: The operator is the responsible person in charge who operates, installs, connects,
maintains, and/or owns the device, its subcomponents, and additional components. To simplify
reading, this document only refers to the operator to distinguish from Enapter but may also include
the user, customer, client, owner, installer, instructor, system integrator, or persons who are
responsible for the safe operation of the device.

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DOCUMENT TITLE
RELEASE DATE
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EL4.1 –Battery Limits
2023-10-06
EL4.1 –Battery Limits –Rev.01 –October 2023IV
TABLE OF CONTENTS
Change history .................................................................................................................. I
Preface .............................................................................................................................II
Enapter Srl................................................................................................................................II
Scope of the document .............................................................................................................II
Approved use............................................................................................................................II
Terms...................................................................................................................................... III
Table of Contents ............................................................................................................ IV
1. Device Interfaces ........................................................................................................5
2. Interface specifications................................................................................................7
2.1 H2O IN...........................................................................................................................7
2.2 O2VENT.........................................................................................................................7
2.3 COOLING WATER IN / OUT..............................................................................................8
2.4 H2OUT ..........................................................................................................................8
2.5 H2VENT.........................................................................................................................9
2.6 FILL / DRAIN...................................................................................................................9
2.7 START / STOP............................................................................................................... 10
2.8 POWER........................................................................................................................ 10
2.9 ETHERNET ................................................................................................................... 11
2.10 DRY CON ..................................................................................................................... 11
2.11 WiFi BUTTON............................................................................................................... 11
2.12 ANTENNA ....................................................................................................................11
2.13 ON/OFF BUTTON / BREAKER ......................................................................................... 11
2.14 FUSES.......................................................................................................................... 11
2.15 HANDLE BAR................................................................................................................ 11
2.16 FRONT MESH ...............................................................................................................12
2.17 LED ............................................................................................................................. 12
2.18 LEAKAGE DRAIN HOLE .................................................................................................. 12

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1.DEVICE INTERFACES
The following figure shows the position of the EL4.1’s physical interfaces.
EL4.1 air cooled AC version front view
EL4.1 liquid cooled DC version front view

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EL4.1 bottom view

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DOCUMENT TITLE
RELEASE DATE
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2023-10-06
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2.INTERFACE SPECIFICATIONS
The following interfaces described refer to the figures above. Not meeting these requirements may
result in higher degradation and damage to the device. The requirements in this document must always
be met. However, this document does not contain the complete list of requirements for each interface.
For more information, please refer to the owner’s manual.
NOTE: The device is under continuous improvement and the technical specifications might be subject
to change. Please make sure to refer to our website for the most recent specifications.
2.1 H2O IN
This inlet port is used for the automatic refilling of highly purified, demineralized water for the
electrolysis process.
Name
H2O IN
Direction
Pressurized input
Fitting Type
10 mm push-fit female bulkhead connector
Fitting Material
POM (Polyoxymethylene)
Fluid
Recommended ASTM D1193-06 Type II or
Type III but at least Type IV1with
-Total Organic Carbon (TOC) <1000ppb
-Total Silica < 500ppb
-Acidity < 0.1meq/l (according to D1067)
-Conductivity < 5µS/cm
Flowrate
Refilling speed up to 1 l/min periodically,
0.42 L/h water consumption in average
Pressure
1-4 barg
Temperature
5-55 °C
Make sure to not exceed the stated limits, especially do not exceed the maximum inlet
pressure.
2.2 O2VENT
This outlet port is directly connected to the electrolyte tank and allows the produced O2to leave the
device. Apart from the produced O2, about 38 g/h of H2O condenses in the line, and this is dependent
on the ambient temperature, vent line material, and insulation. Furthermore, some trace of H2 (<3%
concentration) can be contained in the gaseous vent output in the production range 60%-100%, up to
30 barg (at the beginning of life). In transient conditions conditions (such as ramp-up and ramp-down)
and in the event of stack failure, a flammable mixture shall be expected and managed accordingly
(venting to a safe area without ignition sources along/around the vent system). The O2vent additionally
serves as an overfill port if too much water or electrolyte has been provided.
Name
O2VENT
Direction
Input and output
Fitting Type
⅜” bspp female port

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EL4.1 –Battery Limits –Rev.01 –October 20238
Fitting Material
KOH and heat resistant material like Stainless
Steel 316L
Fluid
O2+ H2O vapor + H2(<3%)
Flowrate
Up to 0.25 Nm³/h (O2) + ~38 g/h (H2O) at 25 °C
ambient temperature
Pressure
<0.5 barg
Temperature
20-55 °C in average, up to 58 °C
Do not combine the O2vent line of the EL4.1 with the O2vent line or other pipes of older
models.
Make sure to not exceed the stated limits, making especially sure that the pressure drop that
happens downstream the O2vent outlet port does not exceed 0.1 bar. The device must be able
to always expel and take in gases.
Make sure that this line is expelling safely into the atmosphere.
Make sure to install an appropriate water trap at the lowest point of the O2vent line to allow
the H2O to drain freely.
Make sure to connect O2, H2and KOH compatible and heat resistant materials only.
2.3 COOLING WATER IN / OUT
Please be aware that this interface might not be available on your device.
This inlet/outlet port allows the device to be cooled via an external cooling loop. Temperature,
pressure, and flowrate must be calculated depending on the individual setup.
Name
COOLING IN / OUT
Direction
Pressurized input / output
Fitting Type
10 mm push-fit female bulkhead connector
Fitting Material
POM (Polyoxymethylene)
Fluid
Clean water or a water-glycol mixture with up to
50% glycol
Flowrate
1-2 L/min non continuous depending on the
temperature
Input pressure
1-4 barg
Input temperature
5-40 °C depending on the pressure and flowrate
Output temperature
<50 °C depending on input temperature
Make sure to not exceed the stated limits, especially do not exceed the maximum inlet
pressure.
Make sure to only provide cleaned fluids, free of particles and install the water filter shipped
with each device right before the COOLING IN port.
2.4 H2OUT
This outlet port releases the produced H2. H2downstream of that port will not flow back through the
device.

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EL4.1 –Battery Limits –Rev.01 –October 20239
Name
H2OUT
Direction
Pressurized output
Fitting Type
¼” bspp female port
Fitting Material
Stainless Steel 316L
Fluid
H2+ 1000 ppm of H2O + <5 ppm O2(35 barg
version) /
H2+ 12000 ppm of H2O + <5 ppm O2(8 barg
version)
Flowrate
0.3-0.5 Nm³/h during hydrogen production
Pressure
Up to 35 barg (35 barg version) /
Up to 8 barg (8 barg version)
Temperature
<58 °C
Make sure to not exceed the stated limits, especially do not exceed the maximum outlet
pressure by attaching pressurized tanks or sudden purges.
Make sure to connect H2compatible and pressure resistant materials only.
2.5 H2VENT
This outlet port allows water which has been extracted from the H2to leave the device. This venting
happens twice during ramp up, every 6 h during operation (35 barg version) / every 1.5 h (8 barg
version) and once during ramp down.
Name
H2VENT
Direction
Input and pressurized output
Fitting Type
¼” bspp female port
Fitting Material
Stainless Steel 316L
Fluid
H2+ H2O
Flowrate
Up to 35 NL/s (transient)
Pressure
Up to 35 barg (transient) (35 barg version) /
Up to 8 barg (transient) (8 barg version)
Temperature
<58 °C
Make sure you do not exceed the stated limits, making especially sure that there is no pressure
building up in this line. The device must be able to always expel gases. Install the check valve
which is included in the shipment directly at the output.
Make sure that this line is expelling safely into the atmosphere.
Make sure to install an appropriate water drainage system to not exceed 0.2 barg of pressure
drops in the pipe at the lowest point of the H2vent line to allow the H2O to drain freely.
Make sure to connect H2and KOH compatible and pressure resistant materials only.
2.6 FILL / DRAIN
This inlet/outlet port is used to fill up the device with electrolyte and to drain it again for maintenance.

VERSION
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RELEASE DATE
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EL4.1 –Battery Limits –Rev.01 –October 202310
Name
FILL / DRAIN
Direction
Input and output non-pressurized
Fitting Type
10 mm CPC quick connector
Fitting Material
POM (Polyoxymethylene)
Fluid
Aqueous KOH solution (1% concentration)
Flowrate
Up to 0.6 L/min
Pressure
Atmospheric
Temperature
5-55 °C
Manual filling volume
2 L –1.54 % KOH concentration
Manual draining volume
Up to 4 L of KOH solution
with up to 2 % KOH concentration
Make sure to connect KOH compatible materials only.
Hold the electrolyte bag above the device in order to fill it.
Hold the electrolyte bag below the device in order to drain it.
2.7 START / STOP
This button allows the operator to start and stop the hydrogen production.
Make sure to never start the device without proper installation, inspection, and approval
according to all relevant local safety guidelines, rules, directives, and regulations.
2.8 POWER
This inlet port allows the power supply of the device.
Name
POWER
Direction
Input
Fitting Type
PCB 3-pin 7.62 mm pitch female socket (AC
version) /
2-pin 16 mm² AMP Power Series - 23.5 mm TYCO
ELECTRONICS (DC version)
Fitting Material
PA (Polyamide)
Fluid
Electric current
Current
0-16 A (AC version) /
0-50 A (DC version)
Voltage
220-240 V (AC version) /
48 –60 V (DC version)
Frequency
50/60 Hz (AC version)
Make sure to always follow the stated limits.
Keep in mind that the device’s production rate is not controlled by adjusting the voltage or
power supply of the device.

VERSION
DOCUMENT TITLE
RELEASE DATE
01
EL4.1 –Battery Limits
2023-10-06
EL4.1 –Battery Limits –Rev.01 –October 202311
2.9 ETHERNET
This port allows reading and writing monitoring, as well as control registers of the device via Modbus
TCP/IP.
Name
ETH
Fitting Type
RJ45 Female Ethernet port
2.10 DRY CON
This port allows external devices to power cut the stack inside the electrolyser.
Name
DRY CON.
Direction
Input and output
Fitting Type
PCB 4-pin 5.08 mm pitch female socket (<2.5
mm² cross section cables)
Fitting Material
PA (Polyamide)
Fluid
Electric current
Maximum input resistance and
current for closed status (S1, COM1)
0.1 kΩ–1 mA
Maximum output resistance and
current in closed status (S2, COM2)
0.01 kΩ–250 mA
Make sure to not exceed the stated limits.
2.11 WIFI BUTTON
The WiFi button allows the operator to switch on/off the WiFi of the device.
2.12 ANTENNA
The antenna port allows the operator to install an antenna for better WiFi connection.
2.13 ON/OFF BUTTON / BREAKER
This button is used to switch on/off the device. Please be aware that this interface might not be
available on your device.
2.14 FUSES
Please be aware that this interface might not be available on your device.
The port allows the operator to replace the fuses in case they burn through.
Name
Fuses
Fitting Type
250 V, 16 A (T), Ø5 x 20mm

VERSION
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RELEASE DATE
01
EL4.1 –Battery Limits
2023-10-06
EL4.1 –Battery Limits –Rev.01 –October 202312
2.15 HANDLEBARS
The handlebars allow the operator to lift and move the device.
2.16 FRONT MESH
The front mesh allows air to enter the device, allows appropriate cooling, and ensures that no H2is
accumulating inside the device in case of an H2leakage.
Make sure to always keep the mesh free of dust and dirt.
2.17 LED
The LED shows the status of the device. For more information, please refer to handbook.enapter.com.
2.18 LEAKAGE DRAIN HOLE
The leakage drain hole allows the operator to drain the tray in case of an electrolyte or water leakage.
Name
Leakage Drain Hole
Direction
Output
Fitting Type
Sealing Plug GPN 915
Fitting Material
PHT
Fluid
KOH, water

VERSION
DOCUMENT TITLE
RELEASE DATE
01
EL4.1 –Battery Limits
2023-10-06
EL4.1 –Battery Limits –Rev.01 –October 202313