# Electrolyser 2.1 (EL 2.1)

Enapter’s patented anion exchange membrane (AEM) electrolyser is a standardized, stackable and flexible system to produce on-site hydrogen. 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.

# Resources

# Images

These images are for illustration purposes only.

# Status LEDs Indications

Action Description LED
Power on The device will turn on as soon as the required input voltage is supplied to the EL2.1 and perform a startup self-check. Red, yellow & green blink thrice
Stand-by (Idle state) The device is idle, waiting for the start of production. Red, yellow & green are off
Stand-by (Max pressure state) The device reached maximum pressure (normally 35 bar) and will resume hydrogen production automatically when the restart output pressure setpoint is reached. Green blinking
Button press When the start-stop button is pressed. Red, yellow & green blink once
Factory Settings Reset Simultaneously pressing the start-stop button and power up the device will activate Factory Settings Reset. Running fire (each LED blinks after another)
Maintenance mode The device is in maintenance mode. Yellow steady
Locate device When locate device is enabled via remote control. Red, yellow & green blinking
Warning Heads-up event which should be taken into account to avoid Error or Fatal Error. Yellow Blinks
Error System stopped. Recoverable error. Red Blinks
Fatal Error System stopped. Unrecoverable error. Hardware repair required. Please contact Enapter support. Red and Yellow Blinks
Panic System stopped. Unrecoverable error. Please contact Enapter support. Red steady with green steady (hardware problem) or yellow steady (software problem)

# Blowdown Routine

This automatic routine will appear if the electrolyser has not been in STEADY or RAMP UP mode for a certain period of time; in other words, if the electrolyser has not been in use for some time. The relief valve on the outlet of the electrolyser which is a mechanical spring valve, not being in use it might not work properly when the 29 bar is reached and might need extra pressure to open the first time.

There will be a warning that notifies when the routine starts: WARNING “WO_20”.

The Blowdown Routine doesn't interfere with the normal ramp up routine, but only makes some changes to the safety routine checks.

The Blowdown Routine can be enabled using Enapter Cloud.

# Factory Settings Reset

Factory Settings Reset presented in EL 2.1 firmware v1.3.0 allows to reset device to factory settings.

To enable Factory Settings Reset user should simultaneously press the Start/Stop button and power up the device, then button should be pressed until LEDs blink running fire (each LED blinks after another) and released in 5 seconds. Electrolyser sends command to UCM to perform Factory Settings Reset. Electrolyser and UCM will be reset to Factory Default Settings.

Electrolyser can be reset using Cloud command Factory Reset or Modbus Holding Register #9 - in this case only Electrolyser settings are reset to Factory Default Settings while UCM settings are saved.

# Remote Monitoring and Control

# Introduction

EL2.1 Control Electrolyser EL 2.1 comes with pre-installed UCM (Universal Communication Module) that allows users to monitor the device. Over-the-air updates ensure that the latest protocols and security fixes are supported.

EL2.1 Dashboard Pre-installed UCM connects to the Enapter Gateway and send performance and error data to the Enapter Cloud. The data is stored in a time series database which displays it real-time on customizable dashboards.

EL2.1 Mobile Enapter’s mobile application ensures quick and easy installation of any energy system. Users can manage the EL 2.1 via the mobile app and will receive push notifications to warn of energy system issues.

# Network Requirements

Network open port requirements:

Port Protocol Destination Host
(IP-Address / Range or Name)
80 TCP,,
443 TCP,,
123 UDP,,
514 TCP and UDP
3478 TCP and UDP,,
8301 UDP,,
8302 UDP,,
8883 TCP,,
19302 UDP stun.l.google.com


Firewall must be stateful.

WI-Fi requirements:

  • 802.11/g/n (2.4 GHz only)

  • 802.12 WEP, WPA, WPA2 Personal (Pre-shared key)


No captive portal or WPA2 Enterprise supported.

# Connecting your Electrolyser to Wi-Fi

To connect the EL 2.1 electrolyser to wireless networks, follow the steps in the iOS or Android Mobile Application guides below. Please note, the QR-code or preinstalled UCM's ID and PIN are required when connecting to Wi-Fi as well as credentials for the 2,4 GHz Wi-Fi network.

Enapter iOS Mobile Application Guide

Enapter Android Mobile Application Guide

During connection to Wi-Fi network the QR-code or preinstalled UCM's ID and PIN needed. The location for both of them is shown on pictures below.

Front view:

EL2.1 QR-code location

Rear view:

EL2.1 UCM ID and PIN

# Safety Heartbeat

This functionality increases safety in cases of loss of control by Enapter Gateway or any 3rd party Modbus master device.

Safety Heartbeat presented in EL 2.1 firmware v1.2.0 is a periodic signal generated by Enaptwr Gateway or any Modbus master device (i.e PLC) to indicate continuous connection with the Electrolyser.

If the Electrolyser does not receive the heartbeat in a time (heartbeat period) — the machine will normally shut down. Lose of the signal may happen when Gateway or PLC is powered off, when there is connection issue.

# EL 2.1 Heartbeat

To activate Heartbeat on the EL 2.1 you need to change Heartbeat parameters. To do it press Write Configuration button in the Configuration section on your EL 2.1 page in the Cloud or using Modbus Holding Register #4600 (for Modbus master) or #4602 (for Enapter Gateway).


Heartbeat_gatewaytimeout_s - timeout for Gateway Heartbeat in seconds. Deafult value = 0 (disabled).

Heartbeat_modbustimeout_s - timeout for Modbus Heartbeat in seconds. Deafult value = 0 (disabled).

# Gateway Heartbeat

How to activate Safety Heartbeat on the Gateway:

  1. Connect to the Gateway - please check this page.

  2. Configure Safety Heartbeat on the Gateway - please check this page.

# Modbus Heartbeat

How to activate Safety Heartbeat using Modbus protocol - please check the example of Writing Heartbeat Modbus Timeout.

# Known Hardware Bugs

  • Electrostatic discharge into the Wi-Fi antenna, may cause crash Ethernet and modbus.

    Solution: Reboot electrolyser using cloud (find the device in Enapter Cloud and execute Reset command (Commands > Electrolyser > Reset) or do system power restart (turn off it and restore power back).

# Firmware

# Firmware v1.3.0 ✨

# Previous Versions

# Firmware v1.2.3

# Firmware v1.2.1

# Firmware v1.2.0

# Firmware v1.1.2

# Firmware v1.1.1

# Firmware v1.1.0

# Firmware v1.0.2

# Firmware v1.0.1

# Firmware v1.0.0