OpenEnergyMonitor.

org
EmonEVSE – WiFi connected EV charging station

Non-tethered IEC 62196 Type-2 (Mennekes) socket

OpenEnergyMonitor in partnership with OpenEVSE

• emonEVSE32-1PH: 32A Single phase (7.4kW)

• emonEVSE32-3PH: 32A Three-phase (22kW)

Manufactured in Wales by OpenEnergyMonitor: Caban Cyf, Brynrefail, Gwynedd, LL55 3NR

openevse.com
openenergymonitor.org

1 Users Guide
Read and save these instructions prior to installing and operating your Charging Station. Retain this
installation guide for maintenance and troubleshooting information. If you have further questions, contact
Customer Service at support@openenergymonitor.zendesk.com

WARNING: To reduce the risk of fire, electric shock, and serious bodily injury, observe the following:
• Installation work and electrical wiring must be done by qualified person(s) in accordance with all
applicable codes and standards.
• When cutting or drilling into structure, do not damage electrical wiring and other hidden utilities.
• Use this device only in the manner intended.

CAUTION: The installation of this charging Station must be in accordance with all national and local
electrical codes.

CAUTION: Exercise caution and common sense when powering the device. Do not connect to a damaged
power source.

WARNING: Power must be disconnected before installation and servicing, cleaning, and other user-
maintenance. Failure to disconnect power creates risk of fire, electric shock, and serious bodily injury.

CAUTION: The product warranty will not cover equipment damage or failure that is caused by improper
installation or operation.

WARNING: Do not install in an environment that is excessively dusty, conductive, corrosive, or gas-filled, is
exposed to open flames, is near strong chemicals or solvents, or where there is excessive heat, shock, or
vibration.

CAUTION: This charging station is not intended for use by persons (including children) with reduced
physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given
supervision or instruction concerning the use of the charging station by a person responsible for their safety.
Children should be supervised to ensure that they do not play with the charging station.

Introduction

EmonEVSE WiFi connected non-tethered IEC 62196 Type-2 (Mennekes) socket EV charging station is a
collaboration between OpenEVSE and OpenEnergyMonitor.org.

License

This manual is released under the Creative Commons 3.0 with Attribution, share alike license.
OpenEVSE / OpenEnergyMonitor fully open-source projects with all source materials freely shared. The
licenses are clearly defined and there are zero additional restrictions. OpenEVSE / OpenEnergyMonitor may
be used for commercial purposes as defined in the licenses.

OpenEVSE Code license – GNU General Public License v3

OpenEVSE Content license (including this document) – Creative Commons 3.0 with Attribution Share alike
(CC 3.0 BY-SA)

The OpenEVSE Project and Source code has been evaluated by the Open Source Hardware Foundation and
meets the requirements for Open Hardware. The registration number for EmonEVSE is US000028.

Document V1.4.8 16/02/22 2

EmonEVSE Datasheet

Specifications Model: emonEVSE32-1PH Model: emonEVSE32-3PH

AC Input
Operating Voltage 230 VAC (1PH+N) 400 VAC (3PH+N)
AC Frequency 50Hz 50Hz
Supply cable max outer diameter 18mm 18mm
AC Output
Current 6A - 32A 6A - 32A
Output Power @230V
7.4kW 22kW
AC Contactor 40A (IEC 61095 / IEC 60947-5) 40A (IEC 61095 / IEC 60947-5)
EV Socket Non-locking IEC 62196 Type 2 (Mennekes) IEC 62196 Type 2 (Mennekes)
Features
Type LCD 16 Character 2 Lines LCD 16 Character 2 Lines
Display
Backlight Color (RGB) Color (RGB)
Temperature Monitoring Yes Yes
Real Time Clock (RTC) Yes Yes
Current Measurement Real-time, kWh session, kWh Total Real-time, kWh session, kWh Total
kWh limit Yes Yes
Session Options
Time limit Yes Yes
Web UI control, Emoncms, MQTT Web UI control, Emoncms, MQTT
WiFi Connectivity (2.4GHz)
data-logging data-logging
Open API (RAPI) Serial / HTTP/ MQTT Serial / HTTP/ MQTT
Low standby power consumption 2W 2W
Safety
Power Interlock Yes Yes
Pilot Signal Yes Yes
Ground Monitoring Yes Yes
Ground Fault Interrupt (GFI) 15mA - 20mA 15mA - 20mA
Welded Contact Detection Yes Yes
Cable current rating detection (PP) Yes Yes
Self-test Power-on and before energizing Power-on and before energizing
50% 65°C 65°C
Temperature 25% 68°C 68°C
Throttling Shutdown 71°C 71°C
Resume 100% 62°C 62°C
Max Operating Temperature -30°C to +50°C -30°C to +50°C
EV Diode Check Yes Yes
Ventilation Check Yes Yes
Approval CE CE
LVD 2014/35/EU (BS EN 60335-1:2012+A13:2017 & BS EN 60950-22:2017)
EMC 2014/30/EU (BS EN 61000-6-1:2007 & BS EN 61000-6-3:2007+A1:2011)
RED 2014/53/EU (EN 301 489-1 V2.1.1)
EV Charging Compliance (mode 3): BS EN 61851-1-2019 /IEC 61851-1-2017) &
BS EN 61851-22:2002/IEC 61851-22:2001
RoHs 2011/65/EU
Standards Compliance WEEE 2012/19/EU (Reg No. WEE/KG4239XX)
Warranty
Standard 3 Year 3 Year
Enclosure
Material White ABS Plastic White ABS Plastic
Protection Rating IP54 IP54
Weight 3Kg 3.3Kg
Dimensions (H x W x D) 300 x 230 x 100 mm 300 x 230 x 100 mm

3 Users Guide
EmonEVSE Installation

The following is recommendation for a typical domestic installation in the UK.

EmonEVSE should be installed by a competent electrician in accordance with

BS7671:2018+A1:2020 (18th edition) and IET code of practice.

The EmonEVSE requires:

• Dedicated circuit
• RCD: duel-pole Type-B RCD with 6mA DC leakage protection e.g Chint NL210,
Proteus 63/2/30B, IMO B10R2040-30-B
◦ Single-phase: https://shop.openenergymonitor.com/type-b-rcd-1p-n-chint-nl210-63-263-30/
◦ Three-phase https://shop.openenergymonitor.com/type-b-rcd-3p-n-chint-nl210-63-463-30/

• MCB: 32A Curve C or 40A Curve B MCB overcurrent protection

• EmonEVSE should be earthed in accordance with BS7671:2018+A1:2020.

• Earth rod* or CPC disconnection / O-PEN detection device e.g Matt-e unit should be
used when applicable**.
• PME earth facility shall not be used as means of earthing if EVSE is
connected to an EV located outdoors. See BS7671:2018+A1:2020 Section
722.411.4.1

• Screw terminals to be tightened to 2Nm

• All terminals in the EmonEVSE should be checked for correct tightness
upon final installation
• Unit should be wall mounted using stainless steel screws and wall plugs (provided)

*Earth-rod impedance must be <150Ω for reliable charging of all vehicle types (this
exceeds the 200 Ω requirement of BS7671).

**It’s possible to get a single unit which combines Type-B RCD, MCB and O-PEN protection
in a single unit e.g Matt:e SP-EVCP-B, Garo G8EV40PMEB or Proteus AEVB63M40

The EmonEVSE contains an integral RCD which trips at 20mA AC, this RCD will auto-reset
and will display status on the LCD. See Safety and Session Errors in the EmonEVSE user
guide.

Weatherproof

The EVSE enclosure is IP56 rated. It’s preferable to install the unit in a sheltered location.
Please ensure enclosure font housing is fully attached and waterproof seals are intact and
clean of debris. It’s important that the 4x enclosure screws (top/bottom) are fully
tightened and the rubber seals are in place.

Do not over-tighten the screws attaching the EVSE base-plate to the wall, since
this could distort the enclosure compromising the waterproof seal.

Document V1.4.8 16/02/22 4

EmonEVSE Web Interface Quick Start

All functions of the OpenEVSE can be viewed and controlled via the web interface.

WiFi Connection
On first boot, OpenEVSE will broadcast a WiFI access point (AP) OpenEVSE_XXX. Connect
to this AP (default password: openevse) and the captive portal should forward you to the
log-in page.

Select your WiFi network from list of

available networks
•Enter WiFi PSK key then
click Connect
Illustration 1: EmonEVSE WiFi Setup •OpenEVSE should now connect to
local WiFi network

5 Users Guide
 •Re-connectdevice to local WiFi network and connect to OpenEVSE using local IP address or
hostname displayed on LCD on first connection and each time on startup.

If WiFi connection / re-connection fails (e.g. network cannot be found or password is incorrect) the
OpenEVSE will automatically revert back to WiFi access point (AP) mode after a short while to allow a
new network to be re-configured if required. Re-connection to existing network will be attempted every
5 minutes.

For a full EVSE web interface setup guide e.g Emoncms. MQTT, SolarPV divert see:
https://guide.openenergymonitor.org/integrations/evse-setup/

For technical details of the WiFi gateway e.g remote open API control see:
https://github.com/openevse/ESP32_WiFi_V4.x/

Illustration 2: EmonEVSE Eco Mode (Solar PV divert )

example

Document V1.4.8 16/02/22 6

Power on self-test errors
Possible errors returned during the self test are:

EmonEVSE did not detect a GFCI Fault

GFCI Self Test Failed Check GFCI CT and Self test coil
during test
Earth Ground Test Check Ground Connections and
EmonEVSE could not detect a Ground
Failed AC_Test lines
Stuck Relay Test EmonEVSE read AC voltage before
Check Relay and AC_Test Lines
Failed Relays were closed

Session Errors

EmonEVSE will rerun GFCI self-test

and retry charging. If Ground fault
EmonEVSE detected a ground leakage
GFCI FAULT indicates immediate failure. Charging
of > 20ma
is suspended. If GFCI continues
regularly Contact Support
Check Electrical Ground, Contact
NO GROUND EmonEVSE lost connection to ground
Support
Power was detected when line should
STUCK RELAY Contact Support
be open.
Ventilation requested by the Electric
VENT REQUIRED EmonEVSE read a pilot signal at 3V
Vehicle.
Ensure Charge handle is dry and
DIODE CHECK EmonEVSE did not detect a Vehicle
clean. Contact Support.
Investigate cause of high temperature
High temperature event (over 62C),
event. Charge at lower current, keep
HIGH TEMP detected during last charging session
unit out of direct sunlight and check
temperature throttling was engaged.
internal wiring.
If outside air temperature is very hot,
keep station out of direct sunlight and
OVER TEMPERATURE Temperature over 72C detected
charge at lower current. Check
internal wiring and contact Support.

Safety

EmonEVSE was designed to comply and exceed safety requirements for Electric Vehicle Charging from SAE J1772 / BS
EN 61851-22:2001 / NEC / UL

Power interlock

EmonEVSE includes an interlock that de-energizes the electric vehicle connector and cable whenever the electrical
connector is uncoupled from the electric vehicle.

Pilot Signal

EmonEVSE supports the SAE J1772 pilot signal which provides an automatic means to de-energize the cable conductors
and electric vehicle connector upon exposure to strain that could result in either cable rupture or separation of the cable
from the electric connector and exposure of live parts.

7 Users Guide
Self Check

EmonEVSE performs a Self-Testing sequence during start up to ensure unit is working properly and safely upon power-up
EmonEVSE checks for:

 GFCI--Ability to respond to a 20mA ground fault

 Missing Ground

 Welded Relay Contact Monitor

 Pilot line status

Ground Monitoring

EmonEVSE checks ground during power-up and constantly monitors for presence of proper safety ground during
operation. If ground is lost charging is discontinued.

Ground Fault Interrupt

EmonEVSE includes mandatory Ground Fault Interruption (GFCI).

 Fault sensitivity of 20ma trip for protection against electric shock of personnel.

 After each GFCI event EmonEVSE will retry charging up to 4 times after a 5 minute delay per event.

 Ground Fault circuit tested during Power on Self-test.

Stuck Relay detection

EmonEVSE checks relay contacts on power up to ensure relays are functioning properly and providing proper power
interlock.

Electric Vehicle Identification

EmonEVSE verify the pilot signal integrity by checking the Electric Vehicle Diode. The pilot signal must BOTH be at the
correct resistance AND pass the "diode check" to activate the circuit.

Ventilation Required

EmonEVSE checks for the “Ventilation Required” request from Electric Vehicles with lead acid batteries (not common).
By default EmonEVSE will deny charging if ventilation is not available. With additional hardware and firmware update
EmonEVSE can allow “Ventilation Required” charging if the charging station is equipped to activate ventilation.

EV Cable current rating detection

EmonEVSE complies to BS EN 61851:1:2001 proximity detection mechanism to detect the maximum current rating of a non-tethered
EV cable. Charging current is not allowed to exceed the maximum rating of the EV charging cable in use.

Internal Temperature
EmonEVSE Continuously monitors the internal temperature of the Charging Station and will shutdown if the internal
temperature exceeds 71°C.

Document V1.4.8 16/02/22 8

Temperature Throttling
EmonEVSE Actively reduces charging current during high temperature events in several steps beginning at 65°C. A
persistent waring is displayed on the LCD during an after a high temperature event. If temperature drops full current is
restored. Charging will be halted if temperature exceeds the critical level 71 °C.

Resources

Support

Community Forum: https://community.openenergymonitor.org/c/integrations/openevse

E-mail: support@openenergymonitor.zendesk.com

Tel: +44(0)1286 800870

Resources:
• WiFi Gateway Setup: https://guide.openenergymonitor.org/integrations/evse-setup/
• EVSE WiFi Gateway technical guide: http://github.com/openevse/ESP32_WiFi_v4.x/
• OpenEnegyMonitor Setup: https://guide.openenergymonitor.org
•

Web Store
• https://shop.openenergymonitor.com

Website
• https://openenegymonitor.org
• https://openevse.com/

WiFi Gateway Firmware: http://github.com/openevse/ESP32_WiFi_v4.x/

EmonEVSE Controller Firmware: https://github.com/openenergymonitor/open_evse

9 Users Guide
EmonEVSE
Warranty

The emonEVSE EV charging station unit is guaranteed for a period of 3 years from the date of
purchase. The guarantee covers component, material and workmanship factory defects. In the
unlikely event of any of the above defects we will, at our discretion either repair or replace the unit
at no cost.

The guarantee is subject to the following conditions:

• The unit has been correctly installed following the instructions in the User Guide
• The unit is used with an electrical supply rating printed on the data-plate sticker
• The unit has only been used to charge an electric vehicle
• The unit has not been altered, modified or customised by any person not authorised by us.
This includes the use of non-certified firmware modification.
• Connector protection cover is closed when EV cable is not connected

The guarantee does not cover:

• Damage resulting from transportation, improper use, neglect or improper installation.

• Damage due to water ingress from improper installation.

Contact Information

Telephone: +44(0)1286 800870

Email: support@openenergymonitor.zendesk.com
https://openenergymonitor.org
https://shop.openenergymonitor.org

OpenEnergyMonitor (Megni), Caban Cyf, Brynrefail, Gwynedd, LL55 3NR, United Kingdom

Document V1.4.8 16/02/22 10