Ohme

The Ohme integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] allows you to connect your Ohme EV charger to Home Assistant.

Prerequisites

• Ah Ohme account. If you signed up to Ohme with a third party account like Google, you will need to reset your password before configuring this integration.

Supported devices

The following devices are known to be supported by the integration:

• Ohme Home Pro
• Ohme Home
• Ohme Go
• Ohme ePod

Configuration

To add the Ohme device to your Home Assistant instance, use this My button:

Supported functionality

Entities

The Ohme integration provides the following entities.

Buttons

• Approve charge
  • Description: If sensor Status is Pending approval, this will approve the charge.
  • Available for devices: all

Numbers

• Target percentage
  • Description: Sets the charge target for your vehicle.
  • Available for devices: all
• Preconditioning duration
  • Description: Defines how long to precondition your vehicle before the target time. 0 means preconditioning is disabled.
  • Available for devices: all

Selects

• Charger mode
  • Description: Sets the mode of the charger. Possible options: Smart charge, Max charge, Paused. This is only available with a vehicle plugged in.
  • Available for devices: all
• Vehicle
  • Description: Select the vehicle to charge. This will show vehicles configured in the Ohme app.
  • Available for devices: all

Sensors

• Status
  • Description: Current status of the charger. Possible states: Unplugged, Pending approval, Plugged in, Charging, Finished charging.
  • Available for devices: all
• Power
  • Description: Power draw from the charger in kW.
  • Available for devices: all
• Current
  • Description: Current draw from the charger in amperes.
  • Available for devices: all
• Energy
  • Description: Energy consumption of the charger in kWh.
  • Available for devices: all
• Voltage
  • Description: Voltage supplied to the charger. This is only available when a vehicle is connected.
  • Available for devices: all
• CT current
  • Description: If a current transformer (CT) was installed with your charger, this will show the current used by your whole home.
  • Available for devices: Home Pro, ePod
• Charge slot list
  • Description: A list of charge slots for the plan generated by Ohme. This is only available when a charge is in progress.
  • Available for devices: all

Switches

• Price cap
  • Description: Prevents charging when the electricity price exceeds a defined threshold. The threshold can be set by the service ohme.set_price_cap. Not available with some energy providers and tariffs.
  • Available for devices: all
• Lock buttons
  • Description: Disable the controls on the device.
  • Available for devices: all
• Require approval
  • Description: Require approval every time a vehicle is plugged in.
  • Available for devices: Home Pro
• Sleep when inactive
  • Description: Turn off the screen of the device after a few minutes of inactivity.
  • Available for devices: Home Pro

Times

• Target time
  • Description: Sets the time you need your vehicle charged by.
  • Available for devices: all

Actions

The integration provides the following actions.

Action: List charge slots

The ohme.list_charge_slots action is used to fetch a list of charge slots from your charger. Charge slots will only be returned if a charge is in progress.

Action: Set price cap

The ohme.set_price_cap action is used to set the price cap threshold. This can be toggled by the switch Price cap.

Use cases

This integration enables several use cases to optimise efficiency of a solar and/or battery storage system.

Solar charging

Use the charger mode to maximize solar consumption:

• Set the charger to “Paused” when solar production is low
• Switch to “Max charge” during peak solar hours

Battery storage

If you have a home battery system:

• Charge your EV when the battery is above certain capacity
• Pause EV charging when the battery needs replenishing

Examples

Send a notification on status change

To be notified when the status of the charger changes, for example when a vehicle is plugged in, you can use an automation.

# Example automation
triggers:
  - trigger: state
    entity_id:
      - sensor.ohme_home_pro_status
    from: unplugged
actions:
  - action: notify.mobile_app_iphone
    data:
      message: "Vehicle plugged in"

Troubleshooting

Entities are shown as unavailable

You may need to power cycle your charger. Please see the manufactuer’s guidance for the procedure.

Data updates

This integration fetches data every 30 seconds with the following exceptions:

• CT readings are fetched every minute.
• Device settings are fetched every 30 minutes.

Known limitations

The integration does not provide the ability to manage vehicles or routines, which can instead be managed on the manufacturer’s app.

Removing the integration

This integration follows standard integration removal. No extra steps are required.

To remove an integration instance from Home Assistant

1. Go to Settings > Devices & services and select the integration card.
2. From the list of devices, select the integration instance you want to remove.
3. Next to the entry, select the three-dot menu. Then, select Delete.