Summary
Smart EV tariffs reward charging at specific off-peak hours — commonly overnight — with electricity priced at a fraction of the standard rate (sometimes under 10p/kWh against a 25-30p/kWh standard unit rate). Getting a customer onto one of these tariffs and correctly linked to their charger is now a routine add-on to a charger installation, and increasingly a standalone service for customers whose charger was installed before they switched tariff or who are struggling to get scheduling working correctly.
The work itself is largely non-electrical: creating or configuring the energy supplier's smart tariff account, linking the charger manufacturer's app to that tariff (directly, via API, or via the vehicle manufacturer's own connected-car data where the tariff uses vehicle-level smart charging instead of charger-level), and checking that the property has a compatible smart meter sending half-hourly readings — without which the supplier can't settle the tariff correctly. Where the charger or vehicle doesn't support direct tariff integration, some suppliers use an OBD dongle fitted to the vehicle instead, which is a small hardware/labour cost.
This is priced as a service add-on, not a trade rate job — most of the margin is in the electrician or installer's product knowledge (which tariffs pair well with which charger/vehicle combination) rather than time on tools. For the charger installation itself, see ev charger pricing guide; for the regulatory default scheduling that applies even without a smart tariff, see ev charger smart charging regulations 2022.
Key Facts
- Smart meter requirement — most smart EV tariffs require a working smart meter sending half-hourly consumption data (SMETS2, or SMETS1 enrolled onto the national network); without this the supplier cannot settle the tariff and the customer will be rejected or reverted to a standard rate.
- Charger-level vs vehicle-level smart charging — some tariffs (e.g. Octopus Intelligent Go) link to the vehicle via its manufacturer API or an OBD dongle rather than the charger itself; others work purely through the charger's own app (e.g. Ohme's tariff integrations).
- Typical setup components — supplier/tariff account setup or switch, charger or vehicle app account linking, smart meter verification, and (where needed) OBD dongle fitting.
- OBD/telematics dongle — used where the vehicle lacks a manufacturer API integration; typically supplied by the energy supplier or charger brand, sometimes at the installer's cost to fit.
- Timeframe — tariff account approval/switching can take days to a few weeks on the supplier side; on-site configuration itself is usually under an hour once the account is active.
- Add-on vs standalone — cheapest to bundle into a new charger install visit (app/account setup takes minutes if the electrician is already on-site and configuring the unit); standalone visits cost more because they're a dedicated call-out for a largely non-electrical task.
- No new electrical work required — in nearly all cases, smart tariff setup needs no changes to the circuit, charger hardware, or consumer unit; it's purely account and app configuration.
- Troubleshooting demand — a recurring paid job is "my scheduled charging stopped working after I switched supplier," caused by a broken tariff-to-charger link rather than any electrical fault — see ev charger fault codes ohme and ev charger fault codes pod point for brand-specific diagnosis.
Quick Reference Table
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Try squote free →| Scenario | Typical price | Notes |
|---|---|---|
| Bundled with new charger install | £40-£80 add-on | Minimal extra time if done during the main install visit |
| Standalone setup on existing charger | £60-£150 call-out | Dedicated visit; may include smart meter check |
| Smart meter compatibility check only | £0-£40 | Often folded into the above; separate if no other work done |
| OBD/telematics dongle fit (where required) | £20-£60 labour + dongle cost (often supplier-subsidised) | Vehicle-dependent; not all cars need this |
| Troubleshooting a broken tariff link post-supplier-switch | £50-£100 | Diagnostic + re-link; usually resolved within the visit |
| Full re-education visit (multiple tariffs/chargers in household) | £80-£150 | E.g. two EVs, two chargers, differing schedules |
Detailed Guidance
What actually needs doing on site
- Confirm smart meter status — check the property has a working smart meter actively sending half-hourly data; a non-communicating or SMETS1 meter not enrolled on the network will block tariff eligibility regardless of charger brand.
- Set up or verify the tariff account — either help the customer apply for the tariff (which is a supplier-side process, not something an installer can do on their behalf for account security reasons) or confirm an existing tariff account is active.
- Link charger/vehicle to the tariff — this varies by combination: some chargers connect directly to the tariff via the charger manufacturer's app; some tariffs instead read the vehicle's own API (needing the customer's vehicle account credentials) or require an OBD dongle fitted to the car's diagnostic port.
- Set the schedule and departure time — configure the "ready by" time and confirm the first scheduled charge completes successfully before leaving site.
- Document the setup — note which method is used (charger-level vs vehicle-level smart charging) so a future call-out (e.g. after a supplier switch) starts from the right diagnosis.
Charger-level vs vehicle-level integration — know the difference before quoting
Not every combination works the same way, and misquoting this is the most common error. A charger with its own tariff integration (several Ohme models, for example) configures entirely through the charger's app. A tariff that instead manages charging at the vehicle level needs either a compatible connected-car API (so the tariff provider talks directly to the car, regardless of which charger brand is fitted) or an OBD dongle where no API exists. Confirm which model applies to the specific charger and vehicle before quoting a fixed price — vehicle-level setups can take longer if dongle fitting is involved.
Smart meter problems are the most common blocker
A smart meter that isn't actually sending data (common with older SMETS1 meters, or meters in poor-signal locations) will silently block tariff eligibility — the customer may be told simply "application unsuccessful" with no detail. Checking meter communication status before promising a customer a smart-tariff setup avoids an abortive visit; this is worth a short diagnostic step even on a bundled new-install job.
When it's a billing/supplier issue, not an installer's job
Account creation, billing disputes, and tariff eligibility decisions sit with the energy supplier, not the installer — be clear with customers about where the boundary is. The installer's job is the technical link between charger/vehicle and tariff, plus troubleshooting that link; it is not resolving a supplier account or billing problem.
Frequently Asked Questions
Does every smart tariff need an OBD dongle?
No — many setups use either the charger's own app-level tariff integration or a connected-car API that needs no extra hardware. A dongle is only needed where neither of those options is available for the specific vehicle/tariff combination.
Can I set this up without a smart meter?
Generally no. Time-of-use smart tariffs rely on half-hourly consumption data from a smart meter to bill the off-peak rate correctly; without one, the supplier typically won't onboard the customer onto the tariff at all.
Why did scheduled charging stop working after switching energy supplier?
The charger or vehicle's tariff integration is usually linked to a specific supplier account; switching supplier breaks that link until it's re-established in the charger/vehicle app with the new account details. This is the most common "fault" call-out on smart-tariff-enabled chargers.
Is this a chargeable job on its own, or should it always be free with an install?
Both models exist in the market — some installers fold basic setup into the install price as a value-add, while others charge it separately, particularly for standalone visits on chargers they didn't originally fit. Pricing it explicitly avoids under-charging for what can be a 30-60 minute task with real troubleshooting value.
Regulations & Standards
Electric Vehicles (Smart Charge Points) Regulations 2021 — sets the baseline default off-peak smart charging behaviour that all domestic chargers must support, independent of any specific tariff.
Smart Metering Implementation Programme (SMETS2) — the technical standard underpinning smart meter data used by suppliers to bill time-of-use tariffs.
BS 7671:2018+A2:2022, Section 722 — unaffected by tariff setup, but remains the governing standard for the underlying charger installation.
Ofgem — Smart Meters — smart meter eligibility and half-hourly settlement background.
GOV.UK — Electric Vehicles (Smart Charge Points) Regulations 2021 — default smart charging requirements.
Ohme Support and Pod Point Support — manufacturer guidance on tariff integration setup.
ev charger pricing guide — core EV charger installation pricing.
ev charger smart charging regulations 2022 — the regulatory baseline for smart charging default behaviour.
ev charger fault codes ohme — diagnosing tariff/scheduling issues on Ohme chargers.
ev charger fault codes pod point — diagnosing connectivity/scheduling issues on Pod Point chargers.