If you manage a fleet and are considering adding electric vehicles, there’s a question you probably haven’t thought about yet: how does vehicle monitoring change when you switch from diesel to electric?
The answer is: quite a lot. And it’s not just about fuel vs. electricity.
Different data, different decisions
A diesel vehicle and an electric vehicle generate fundamentally different data. On a traditional vehicle, telematics monitors fuel consumption, engine RPM, tank level and mechanical anomalies. These are well-established, standardized and well-understood parameters.
On an electric vehicle, entirely new metrics come into play:
- State of Charge (SoC): the battery charge level — equivalent to the fuel tank but with very different dynamics (charging isn’t as instant as filling up with diesel)
- State of Health (SoH): overall battery health, which degrades over time and affects both range and residual vehicle value
- Cell temperature: lithium batteries are sensitive to temperature. Extreme cold and intense heat can reduce real-world range by 20-30%
- Charging sessions: charge type (AC/DC), duration, energy absorbed, cost per kWh
- Energy efficiency per route: consumption in kWh/km, influenced by driving style, payload and route profile
For a fleet manager, this means that the tools used to monitor a diesel fleet are no longer sufficient. You need platforms capable of reading and interpreting these new parameters.
The OBD port problem
Most telematics devices connect via the vehicle’s OBD-II port (On-Board Diagnostics), a standard originally designed for combustion engine diagnostics. It works well on traditional vehicles: data is standardized and devices are compatible with nearly every model.
With electric vehicles, things get complicated:
- Lack of standardization: EV manufacturers aren’t bound by the same data communication standards via OBD. Each manufacturer uses different protocols.
- Missing or limited OBD ports: some electric models don’t have a traditional OBD port at all, or keep it but with reduced functionality.
- Meaningless data: many OBD-II parameters are designed for combustion engines (intake manifold pressure, O2 sensor status) and have no relevance on an EV.
This doesn’t mean tracking is impossible. It means you need a telematics system designed to handle both worlds — combustion and electric — with the flexibility to adapt to different protocols.
What to monitor on an electric fleet
If you’re adding electric vehicles to your fleet, here are the key parameters your telematics platform should track:
Battery and range
- Real-time charge level (SoC)
- Battery degradation over time (SoH)
- Estimated remaining range based on the assigned route
- Alerts when range drops below a critical threshold
Charging
- Charging session history (where, when, how much)
- Energy cost per charge and per km
- Comparison between depot charging, home charging and public charging
- Charging schedule optimization to take advantage of off-peak rates
Efficiency and driving style
- Energy consumption per route (kWh/km)
- Regenerative braking usage (EV-specific)
- Driver scoring calibrated for electric vehicles — where harsh braking has a different meaning than on a diesel vehicle
Emissions and reporting
- Calculation of avoided emissions compared to an equivalent diesel vehicle
- Data ready for ESG and sustainability reporting
The transition isn’t a switch
The reality is that most fleets won’t go fully electric overnight. For years — and probably for the rest of this decade — fleets will be mixed: diesel, hybrid and electric vehicles coexisting.
This makes it even more important to have a telematics platform that manages everything from a single point. Comparing the real costs of a diesel van against an electric van on the same route, with the same data, is the only way to make decisions based on numbers rather than opinions.
The role of telematics in the transition
Telematics isn’t just a tool for knowing where your vehicles are. It’s the decision engine behind the electric transition:
- Before purchasing: your current fleet data (daily km, urban routes, idle patterns) tells you which vehicles are worth replacing
- During the transition: parallel monitoring of ICE and EV vehicles shows the real cost comparison
- At scale: advanced battery, charging and range management becomes daily operations
Anyone managing a fleet without adequate telematics isn’t just losing efficiency today. They’re giving up the data they need to make the right decisions tomorrow.