United Kingdom

The Ohme Home Pro and Ohme ePod come with a CT clamp included in the box. The CT clamp monitors the total load going through a home and should be installed so that Ohme’s load balancing feature can be enabled. If the load exceeds the maximum that a house can handle, this feature will temporarily reduce the power of the EV charger to prevent a loss of power.

Follow the steps below to see how to install a CT clamp for each Ohme charger.

Jump to:

Ohme Home Pro
Ohme ePod
Take CT clamp reading

Ohme Home Pro

Junction box open showing internal wiring

Step 1

Once the Ohme Home Pro has been fixed to the wall, connect the data cable wires in the junction box.

Note: It is important not to feed the cable through the top of the junction box to minimise the risk of water ingress.

Wago lightbox with data cables and CT clamp cables connected

Step 2

Connect the other end of the data cable to the Wago light box (included with the Ohme Home Pro) and join with the wires from the CT clamp.

CT clamp being attached around a cable

Step 3

Attach the CT clamp closest to the cable exiting the smart meter.

Once you have finished installing the CT clamp, you can use the Installer Portal or Installer Mode to check the clamp is reading data correctly.

Ohme ePod

Ohme ePod installation data cable connection

Step 1

Open up the Ohme ePod and attach one end of the data cable to the front piece of the unit using the spring loaded connections.

Wago lightbox with data cables and CT clamp cables connected

Step 2

Once the first end is secured inside the unit, join the other end of the data cable to the CT clamp wired inside the Wago box.

CT clamp being attached around a cable

Step 3

Now the data cable and CT clamp wires are joined, attach the CT clamp closest to the cable exiting the smart meter.

Take CT clamp reading

The Ohme Installer Portal successful CT clamp reading

Installer Portal

Once you have finished installing the CT clamp, you can use the Installer Portal or Installer Mode to check the clamp is reading data correctly.

Tip: Sometimes the electricity usage can be too low to trigger a reading. Turning on an appliance such as a kettle or toaster can help to increase the electricity usage and confirm the CT clamp is connected successfully.

The Installer Portal

Welcome to the Ohme Installer Portal. To commission the Ohme Home Pro, use the three blue buttons on the front of the charger. The Ohme ePod can be commissioned in just three taps via the blue buttons or via this portal.

The Installer Portal also allows you to change or update settings such as charge rate, Load Balancing settings, and take CT clamp readings for both the Ohme Home Pro and Ohme ePod.

Jump to:

Ohme ePod commissioning via the charger

The commissioning of the ePod can be completed in as little as three taps, taking less than a minute. Once the charger has powered up, you can tap ⏹️ stop to set the max amp to 32A, then press ⏹️ stop again to accept that the customer has a 100A fuse, then hold ⏹️ stop for 5 seconds to confirm these settings. 

If you need to enable custom settings, refer to this PDF.

Once the initial commissioning process has been completed the charger settings can only be accessed and changed via the Installer Portal.

Ohme Home Pro commissioning via the charger

The commissioning of the Home Pro can be completed using the on-device touch controls, taking less than a minute. Once the charger has powered up, use the blue buttons to adjust each setting as required and advance to the next screen.

Ohme Logo start up screen on the Ohme Home Pro

Power on

Once the charger has connected to power, you’ll see the Ohme logo pop up on screen.

Ohme Home Pro installer mode set amp screen

Step 1

The first screen of Installer Mode will allow you to set the maximum output of the charger. This will be set to 32A by default, but you can use the buttons to increase or decrease the amperage output. When you’re finished, tap the right button to continue.

Ohme Home Pro installer mode Load Balancing screen

Step 2

Load Balancing works in conjunction with the CT clamp and allows Ohme to dynamically adjust the output of the charger to keep within the electrical capacity of the home and prevent a loss of power. Load Balancing can be enabled or disabled using the touch controls. If Load Balancing is disabled, skip to Step 4.

Note: If no CT clamp is installed, Load Balancing should be disabled. Enabling Load Balancing without a CT clamp will mean the charger output is capped at 16A.

Ohme Home Pro installer mode set Load Balancing amps screen

Step 3

If Load Balancing is enabled, the next step is to set the Load Balancing threshold. For a standard installation, this will be set to the size of the main incoming supply.

Ohme Home Pro installer mode RCD test mode screen

Step 4

The final screen is the RCD Test Mode. The RCD will reset after 2 seconds. When Load Balancing is enabled and a CT clamp has been installed, you’ll see the CT clamp reading at the bottom of the screen. Here you can see the reading is 1.0A.

If you can’t get a reading, try boiling a kettle or using another high powered appliance as this can help record a reading. Once finished, tap Exit Setup for User Mode.

Ohme Home Pro Installer mode connecting to internet screen

Connecting to internet

Once the Installer Mode set up has been completed, the charger will establish a connection to the internet.

Ohme Home Pro installer mode connecting to Ohme screen

Connecting to Ohme

Once a connection to the internet has been established, the charger will connect to the Ohme server.

Ohme Home Pro installer mode checking for updates screen

Checking for updates

Finally, Ohme will check for any firmware updates.

Ohme Home Pro displaying a QR code ready for pairing

Commissioning complete

A QR code will then be displayed ready for the charger to be linked to a customer’s Ohme account.

When creating their Ohme app account, the customer can use their device camera to ‘scan’ the QR code and link the account with the charger. The charger serial number is displayed beneath the QR code, and on the underside of the unit if required.

Online commissioning via the Installer Portal

Once the initial commissioning process has been completed the charger settings can be remotely accessed and changed via the Installer Portal. You can use the Installer Portal to take a CT clamp reading (to check it’s connected correctly), adjust the max amp setting, activate load balancing, and set the fuse rating.

The Ohme Installer Portal login page

Step 1

Navigate to the Installer Portal page and log in with your Installer account details. To get access to the Installer Portal, register here.

You’ll receive your login detail via email (make sure you check your junk mail folder). It’s a good idea to bookmark the link to the installer app on your phone or tablet so you can easily access this when installing a unit.

Installer Portal scan QR code

Step 2

Once logged in, click on the type of unit you want to commission then scan the QR code on the underside of the unit. If you’re unable to scan the QR code, you can enter the serial number manually, then tap ‘search’.

The Ohme Installer Portal take CT clamp reading

Step 3

Once you’re connected to the charger, you’ll be asked to take a CT clamp reading. A successful reading will confirm the CT clamp has been installed correctly.

The Ohme Installer Portal unsuccessful CT clamp reading

Unsuccessful CT clamp reading

If the reading is unsuccessful you will see this message. Check the CT clamp position and wiring, then take another reading until you get a measurement recorded.

Tip: Sometimes the usage can be too low to trigger a reading. Turning on an appliance such as a kettle or toaster can help to increase the usage and confirm the CT clamp is connected successfully.

The Ohme Installer Portal successful CT clamp reading

Step 4

A successful CT clamp reading will show the measurement recorded and the button will turn green to confirm. Now you can finish commissioning the charger, setting the max charge current and load balancing threshold.

When you’re finished tap ‘Apply settings’.

The Ohme Installer Portal permission required for installer access

Permission required

If the customer has linked with the charger prior to install and commissioning, you will need to request permission to access the charger settings.

The Ohme Installer Portal access granted

Access granted

Once permission has been approved you will have 30 minutes to make changes to the settings of the charger. Including:

  • Taking a CT clamp reading

  • Adjusting the max charge current

  • Enable or disable load balancing

  • Adjusting the load balancing threshold

The Ohme Installer Portal minimum power setting values

Power settings minimum values

If you enter a value less than the required rate, you’ll receive an error and the ‘Apply settings’ button will be greyed out.

How to re-enter Installer Mode on the Ohme ePod

To make changes to charger settings, all Ohme chargers can be put into Installer Mode. Entering Installer Mode is slightly different for each Ohme charger. Follow the steps below for the Ohme ePod to get started.

Ohme epod ev charger

Installer Mode

Once installed, the Ohme ePod will be in Installer Mode and ready to set up as soon as it powers on. When the ePod has been commissioned for the first time settings can only be adjusted in the installer portal.

You can request remote access to a customers charger from the portal in order to make changes.

If you’re with the charger you can also gain access to the charger settings in the installer portal by holding down all three touch buttons until the indicator light shows a moving white light.

How to re-enter Installer Mode on the Ohme Home Pro

To make changes to charger settings, all Ohme chargers can be put into Installer Mode. Entering Installer Mode is slightly different for each Ohme charger. Follow the steps below for the Ohme Home Pro to get started.

Ohme Home Pro front view with on device touch buttons highlighted

Step 1

To enter Installer Mode, first ensure the charger is unplugged from the car. Then, place a finger on all three buttons at the same time for 10 seconds. Two pink lights will appear while you’re holding down.

Ohme Home Pro screen with two options, Installer Mode and Restore Firmware

Step 2

After 10 seconds, the following options will appear. To select Installer Mode, touch and hold your finger on the far left button, corresponding to the side of the screen the option is shown.

Ohme Home Pro front view with left button highlighted

Step 3

Hold your finger down for three seconds, the text will turn yellow to confirm the option you’ve selected and the charger will reboot.

Ohme Home Pro installer mode set amp screen

Installer Mode

Once the charger has powered on again you will see the first screen of the installer mode. Advance through the installer mode settings and tap ‘exit setup’ to return to User Mode.

The RCBO (Residual current Circuit Breaker with Overcurrent protection) is a crucial safety device in any electrical circuit, protecting against earth faults, overloads, and short circuits. If the RCBO has tripped, this guide will walk you through the steps to safely reset it and restore power to the charger.

Checking the RCBO

RCBO switch is down and the power is off

Power is OFF

When the trip switch is fully down the power is OFF.

RCBO switch is down and the power is on

Power is ON

When the trip switch is fully up the power is ON.

RCBO switch is down and the power is off

Tripped

When the trip switch is floppy and won’t stay in the up position the RCBO has tripped and will require a reset.

Resetting the RCBO

person pushing switch down to reset RCBO

Step 1

To reset the RCBO, press the switch down using both parts of the switch.

person pushing switch down to reset RCBO

Step 2

Firmly press the switch down until you hear a ‘click’. This confirms the switch has been reset.

person pushing switch up to power RCBO on

Step 3

Push both parts of the switch up into the ‘ON’ position. The switch should stay in place and power will be restored to the charger.

Note: If the RCBO does not stay in the ‘ON’ position, this could indicate a wiring issue or a fault with the RCBO itself. In such cases, a qualified electrician should be contacted.

 

The installation must be compliant with the IET Wiring Regulations and the IET Code of Practice for Electric Vehicle Charging Equipment. Installation should be carried out by a competent electrician with appropriate knowledge of EV charge point installations.

Ohme ePod installation wall template

Step 1

Using the drill template provided in the box, drill holes using a 7mm drill bit. Remove the front cover of the Ohme ePod and mount the back piece onto the wall using the screws provided.

Ohme ePod installation live neutral and earth wires

Step 2

You can feed the input cable either through the gland in the back or underside of the Ohme ePod. Once you’ve done so, connect the Live, Neutral, and Earth wires.

Ohme ePod installation data cable connection

Step 3

The Ohme ePod has a dynamic load balancing feature. A current sensor (CT) clamp is provided to measure the electrical demand of the property, or sub-board. The unit will limit the maximum current available to the vehicle to keep the household demand below the set threshold or fuse value. Secure the wires of the data cables in the spring loaded Wago located on the front of the unit.

If you’re using a separate data cable and have already used the underside hole for the main cable, use the back hole to feed the cable into the unit.

Note: you’ll require a second gland (M12 or M16) to maintain a weatherproof seal.

Ohme ePod installation reattach front cover

Step 4

Reattach the front cover and install the screw caps provided with the Ohme ePod.

Installation complete

Now that you’ve successfully installed the Ohme ePod, check out the following article for how to commission an Ohme charger.

The installation must be compliant with the IET Wiring Regulations and the IET Code of Practice for Electric Vehicle Charging Equipment. Installation should be carried out by a competent electrician with appropriate knowledge of EV charge point installations.

Drilling backplate of Ohme Home Pro into a brick wall

Step 1

The Ohme Home Pro is designed to be wall mounted to a flat surface. Fixings are included which are suitable for most wall surfaces (e.g. brick/render) but the installer should select their own fixings if these are not appropriate.

Attach the back plate to the wall using the four fixings supplied.

Lifting the Ohme Home Pro charging unit up onto the back plate

Step 2

Mount the unit, carefully guiding the three lugs into the rear of the unit.

Installer screwing in the side screws to hold the Ohme Home Pro in place to the backplate

Step 3

Use the supplied three M4 short machine screws to fix the unit to the back plate.

Junction box open showing internal wiring

Step 4

The Ohme Home Pro is supplied with a one metre fixed input cable/flying lead requiring termination on-site to a suitable junction box, isolation switch, or mini-CU (not supplied). The flying lead conductors are 6mm2 copper, the overall diameter is 15.2mm, suitable for a No. 6 cable cleat.

To connect, typically an installer will either:

·  Install a junction box at ankle height
·  Feed the input cable through a wall and terminate on the other side

Note: The junction box needs to be rated to at least 32A, have sufficient IP rating for the location, and have space for a three-way terminal block (no load balancing) or five-way terminal block (with load balancing).

CT clamp being attached around a cable

Step 5

The Ohme Home Pro has a dynamic load-balancing feature. A current sensor (CT) clamp is provided to measure the electrical demand of the property, or sub-board. The unit will limit the maximum current available to the vehicle to keep the household demand below the set threshold/fuse value.

Where load balancing is activated, if the CT clamp is removed, installed in the wrong location or is faulty, the unit will revert to charge at a maximum of 16A. It is therefore sensible to ensure the spare capacity, after taking account of other loads and diversity, is at least 16A.

Installer screwing the charging plug holster to the wall

Step 6

The charger comes complete with a cable holder and charging gun holster to retain the cable and vehicle connector when not connected to the vehicle. Use a further four fixings to mount these to the wall.

Once the charger is installed and connected to power it will turn on and be ready for commissioning.

Installer coiling the charging cable onto the cable holder

Storage while not in use

When the charger is unplugged from the vehicle it must be stowed away correctly.

Wrap the cable around the cable holder.

The charger plug must be pushed into the holster, you will hear a click when it is locked in place. This protects the charging pins from the elements. Push the button on the top of the holster to release the charging plug.

Installation complete

Now that you’ve successfully installed the Ohme Home Pro, check out the following article for how to commission an Ohme charger.