Fleet managers track charging costs per vehicle by binding every session to a vehicle. The charger records the energy; a credential — an RFID card or an app account — names the vehicle or driver; the energy is priced at that place’s tariff; and the sessions are rolled up per vehicle. It stands or falls on attribution: energy that cannot be tied to a vehicle cannot be costed to one.
Key Takeaways
- Per-vehicle tracking is an attribution chain: session to credential, credential to vehicle, energy to the local tariff, sessions to one report.
- Depot, home and public sessions carry three different price sources; the per-vehicle view exists only when all three land together.
- Unattributed sessions are the leak — and the fixes are procedural: one credential per vehicle and a monthly exception review.
- EVDANCE hardware states the RFID and OCPP lines attribution hangs on; the tracking itself is the platform and the fleet’s register.
The Attribution Chain
Four links connect a plug-in to a line in a cost report:
| Link | How it is made |
|---|---|
| Session → credential | The session is started with something issued to a vehicle or driver: an RFID card, an app account, or — the manual method — a fixed plug assignment in the depot’s routine |
| Credential → vehicle | The fleet’s register: card number against vehicle registration, kept current |
| Energy → money | The tariff of the place the session happened: the depot’s supply price, the driver’s home price, or the public network’s invoice |
| Sessions → report | The period’s sessions summed per vehicle, wherever recorded — one ledger, not three |
The credential link is the one hardware decides. Our guide to RFID and user management for shared chargers covers how per-user records work, and the protocol carrying records to a platform is explained in our OCPP explainer.
Three Streams, Three Price Sources
A vehicle’s month is rarely one stream. Depot sessions are priced from the operator’s own supply (U.S. average commercial price: 14.53 cents per kWh). Home sessions arrive as reimbursement records, priced at the driver’s own tariff (U.S. residential average: 18.31 cents per kWh). Public sessions arrive as network invoices, priced at what the session actually cost.
A total that quietly omits one stream understates exactly the vehicles that use it most — take-home vehicles from the home stream, long-route vehicles from the public one. Sizing the depot is covered in our guide to sizing AC chargers for a fleet depot.
What the Per-Vehicle Number Is For
- Cost per vehicle per period — the basic report: energy and money per vehicle per month, comparable across the fleet.
- Cost per mile — when mileage records join the same report, energy per mile per vehicle; a vehicle whose figure climbs against its peers is a maintenance conversation, not a driver accusation.
- Replacement decisions — per-vehicle energy costs feed the total-cost-of-ownership comparison at renewal, on evidence rather than impression.
- Exception spotting — sessions at odd hours, on the wrong site, or far above a vehicle’s pattern surface in the roll-up — if they carry an identity at all.
And the honest limit: the gaps are procedural, not technical. A card shared between drivers, a home charger with no identity on its sessions, a public session paid out of pocket and never claimed — each is energy the system cannot place. The fixes are discipline: one credential per vehicle, a monthly exception review, and a rule that unclaimed public charging is still reported.
The Hardware Half of Attribution
EVDANCE hardware contributes exactly what its listings state — no tracking feature is claimed, because tracking is the platform and the register, not the post. The EV-AC03201T dual-connector AC station — two Type 2 connectors, up to 43 kW shared (22 kW per connector), IP54 — states RFID access and OCPP 1.6J: the credential at the plug and the protocol that carries the record onward. The EV-ACT3204PE 22 kW wallbox states RFID and app access. Those stated lines are what a platform or spreadsheet works with; the range is on our commercial charging page, and record assembly is covered in how commercial charging stations work.
Frequently Asked Questions
Can I track per-vehicle costs without fleet software?
Yes, at small scale. Session exports plus a spreadsheet register run the identical method — credential, register, tariff, roll-up — with manual labour instead of a platform. Only the labour changes when the fleet outgrows the spreadsheet.
Does home charging belong in the same per-vehicle report?
It should. The reimbursement records are the home stream. A per-vehicle cost that omits home energy understates take-home vehicles against depot vehicles, and the comparison is worthless.
What prices a public charging session?
The network’s invoice for that session — the bill, not an average. Averages are for scale and budgeting; attribution uses what each session really cost.
Related Reading
- RFID and User Management for Shared EV Chargers
- OCPP Explained: What Charge Point Operators Need From EV Charger Hardware
- Fleet Depot Charging: How to Size AC Chargers for Vans and Light Commercial Vehicles
- How Do Commercial EV Charging Stations Work?
