EV charger energy
sub-metering
kWh by charger or feeder for depots, workplaces, hotels and car parks. Charging energy is separated from the building load, allocated to the right cost centre and checked against the site supply.
THE PROBLEM
Chargers arrive faster than the metering behind them
A building owner installs a few chargers for staff or guests, then a few more for a fleet. Soon the chargers are a significant load on the building supply, but their energy is buried in the main bill and nobody can say what the charging costs.
Fleet operators need charging energy per vehicle group to compare electric and diesel running costs. Facility managers need to know how close the charging load comes to the site's capacity, especially when chargers coincide with the building peak.
Many charger brands report energy through their own back office, and mixed charger estates make the data inconsistent.
HOW WE SET IT UP
Independent energy data for every charger feeder
Sub-meters on the charger feeders
We fit a sub-meter, sized to the feeder, on each charger or charger group. The data is the same whatever charger brand is installed, which keeps mixed estates consistent.
Charging against the building peak
With the site incomer metered too, RIOD Live shows how charging adds to the building demand and alerts the facility team before the supply limit is reached.
Allocation to cost centres
Charger feeders are grouped by fleet, department or tenant. Period reports with audit trails export to PDF and Excel for internal recharging.
Transaction billing, planned properly
Selling charging to drivers per session uses metering certified for that purpose in your market. We plan the meter selection with you and carry out certification to your target standard within the project.
AT A GLANCE
EV charger sub-metering at a glance
- Measured
- kWh by feeder or charger, with interval power for capacity planning
- Hardware
- Smart energy sub-meters, designed to a Class 1 accuracy target; existing Modbus meters through our gateway
- Connectivity
- Wi-Fi or 4G, suited to car parks and depots
- Security
- MQTT over TLS 1.2 from every device
- Data goes to
- RIOD Live cloud, or the platform deployed on your own server
- Reports
- Audit trails on every report, PDF and Excel export, AI access to the data through MCP
- Billing note
- Per-session billing to drivers uses certified metering for your market, planned into the project
FAQ
Questions buyers ask us
How do you measure the energy used by EV chargers in a building?
Install a sub-meter on each charger feeder or group of feeders and read it remotely. That separates charging from the building load, gives kWh per charger or group and shows how charging adds to the site peak.
Can sub-meter data be used to bill EV drivers?
For internal recharging to departments or tenants, sub-meter reports work well. Selling energy to drivers per session usually requires metering certified under local rules, so the meter choice for public or paid charging is planned around those rules.
Will EV chargers overload our building supply?
They can if many charge during the building peak. Metering the incomer and the charger feeders together shows the combined demand, and alerts warn the facility team before the limit is reached.
Does it work with any charger brand?
Yes. The meters sit on the AC feeder, so they measure every charger the same way regardless of brand or back office.
Adding EV chargers to a site?
Tell us how many chargers, how they are fed and how you plan to allocate the cost. We will propose the metering and reporting.