Energy monitoring is the continuous measurement and tracking of electricity usage and power demand to understand performance, detect issues, and support optimization. In EV charging, energy monitoring connects charger data and site metering to provide visibility into kWh delivered, peak kW, load profiles, utilization, and cost/carbon impacts across chargers and locations.
What Is Energy Monitoring?
Energy monitoring collects real-time or near-real-time data from electrical and charging assets.
– Energy (kWh): how much electricity is consumed or delivered over time
– Power (kW): instantaneous demand and peak loads
– Electrical parameters: voltage, current, power factor, frequency (where measured)
– Charger operational signals: status, session start/stop, faults, throttling events
– Optional: PV generation, battery charge/discharge, and import/export flows
Energy monitoring can be done at the charger level, circuit level, or whole-site level, depending on objectives.
Why Energy Monitoring Matters for EV Charging
EV charging is a significant and dynamic load, and monitoring is essential for safe and economical operation.
– Prevents overloads by showing when demand approaches site limits
– Supports load management and dynamic power sharing across chargers
– Identifies abnormal behavior such as low power delivery, repeated session failures, or excessive idle time
– Improves billing confidence by validating delivered kWh against metering sources
– Enables energy cost control and demand charge reduction
– Provides the data foundation for sustainability reporting using emission factors
What Can Be Monitored in EV Charging Sites
– Individual charger energy delivery per connector and per session
– Site-level aggregate energy use and power peaks
– Distribution board or feeder loads supplying charger groups
– Charging profiles over time (hourly/daily/weekly)
– Charger utilization patterns and bay occupancy vs energy delivered
– DER interactions: solar self-consumption and battery dispatch supporting charging
– Alerts: offline chargers, abnormal peaks, protection trips, or repeated faults
How Energy Monitoring Works
Energy monitoring typically combines multiple data sources.
– Charger telemetry via OCPP to a CPMS
– Meter values from integrated meters (MID where required for billing)
– External submeters at distribution boards for upstream validation
– Facility meters for building load context and peak monitoring
– Optional EMS integration to coordinate control actions based on measured values
Data is aggregated into dashboards and alerts so operators can act quickly.
Common Use Cases
– Workplace charging: track adoption, fairness, and expansion needs
– Fleet depots: ensure vehicles receive the required energy before dispatch
– Public sites: monitor availability, utilization, and revenue-impacting faults
– Capacity planning: decide when to uprate feeders or add more chargers
– Peak management: reduce demand charges and avoid breaker trips
– Sustainability reporting: calculate CO₂e per site or per session
Best Practices for Effective Energy Monitoring
– Monitor both delivered energy (charger) and upstream energy (site meter) for reconciliation
– Use consistent time zones and data granularity across sites
– Set alerts for peak thresholds, offline states, and repeated fault codes
– Keep circuit labeling and asset IDs consistent from design to operation
– Validate meter configuration during electrical commissioning
– Control access and protect privacy when monitoring employee or driver-linked usage
Limitations to Consider
– Charger-reported kWh and upstream metered kWh can differ due to losses and auxiliary loads
– Data gaps can occur during connectivity outages without buffering/backfill
– Poor installation (CT wiring, phase mapping) can create misleading measurements
– Carbon monitoring depends on correct emission factors and reporting boundaries
– Too much data without clear KPIs can overwhelm teams—dashboards should be role-based
Related Glossary Terms
Energy Analytics
Energy Dashboards
Energy Consumption Analytics
Charge Point Management System (CPMS)
OCPP
MID Metering
Load Management
Emission Factors