Metering for Commercial EV Charging

What to measure

Meter the charging infrastructure on its own feed, and meter it at a resolution that matches the commercial arrangement. Allocating cost to tenants or a fleet operator requires per-port or per-group energy with timestamps; managing demand requires interval data at the site level that includes both building and charging load in the same window.

Where credits are involved, the measurement requirements are prescriptive and independent of what the charger reports over its own network.

• Dedicated electric metering on the EVSE feed, separate from building load
• Per-port or per-group energy and timestamps for allocation
• Site interval demand covering building plus charging load together
• Revenue-grade accuracy where energy is billed, credited or resold

Which hardware fits

Charger-reported energy is convenient but is often not accepted as the record for billing or credit purposes, and it disappears if you change network provider. An independent revenue-grade meter on the EVSE feed keeps the measurement under your control and portable across charging vendors.

For multi-charger installations, a pre-built metering panel with the required CTs, disconnects and communications wired and commissioned before it ships removes most of the field labour and the coordination risk with the electrical contractor.

• Revenue-grade electric meters on EVSE feeds and sub-feeds
• Current transformers sized to charger and feeder capacity
• Metering panels pre-wired for multi-charger installations
• Gateways to deliver interval data to billing, BMS or credit-reporting platforms

Compliance and cost recovery

Recent code cycles have made charging-circuit metering a requirement rather than an option in many jurisdictions, and low carbon fuel standard programmes require metered kWh delivered before credits can be claimed. Both hinge on the meter being dedicated, documented and reporting on the required interval.

The commercial case is usually demand charges. Charging load that lands on the building's existing peak can reset a demand ratchet and cost far more than the energy itself; measured together, building and charging load make load management, staggered charging or on-site storage a decision you can price rather than guess.