kWh delivered per charger is a performance metric that measures the total amount of electrical energy (in kilowatt-hours, kWh) dispensed by a single EV charging station over a defined time period (day, week, month, year). It is a core KPI for evaluating charger utilisation, revenue potential, energy costs, and whether a site is sized correctly for current demand.
What Does kWh Delivered per Charger Mean?
This metric sums the energy delivered by a single charger across all charging sessions in the selected period.
– If a charger delivers 12 kWh in the morning and 18 kWh in the evening, the total is 30 kWh/day
– It can be calculated per charger, per connector, or per site average
– It is often used alongside session count and uptime to understand performance quality, not just activity volume
Why kWh Delivered per Charger Matters
kWh delivered is one of the most practical indicators of charger value.
– Links directly to revenue when pricing is per kWh
– Reflects real demand and helps validate site location quality
– Supports CAPEX recovery analysis and ROI modeling
– Helps plan expansions: add bays when kWh/chg is consistently high
– Improves operational decisions by highlighting underperforming or fault-prone assets
How kWh Delivered per Charger Is Calculated
The basic calculation is:
– Total kWh delivered by charger in period ÷ 1 charger
Data sources typically include:
– Charger internal meter readings (session start and end)
– Certified meters where required (for example, MID metering)
– CPMS exports via OCPP transaction records
Common reporting views:
– Daily kWh per charger (spot patterns and anomalies)
– Monthly kWh per charger (trend and seasonality)
– kWh per connector (useful for dual-port units)
– kWh per available hour (normalizes by uptime)
What Drives kWh Delivered per Charger
kWh delivered is influenced by both technical capacity and user behavior.
– Utilisation rate (how often the charger is used)
– Average session duration and dwell time at the location
– Charger power rating (3.7 / 7.4 / 11 / 22 kW AC, or DC levels)
– Power sharing/throttling (reduces delivered kWh per hour if constrained)
– Uptime and fault rate (offline time directly reduces delivered energy)
– Vehicle mix and onboard charger capability (limits AC power uptake)
– Pricing strategy and access rules (public, workplace, fleet, restricted)
How Operators Use This KPI
kWh delivered per charger is commonly used to:
– Rank chargers by performance and identify high-demand locations
– Detect issues (sudden drops often indicate faults, blocked bays, or connectivity loss)
– Decide where to add more chargers or upgrade the power supply
– Estimate energy procurement needs and peak demand impacts
– Support reporting for sustainability metrics such as CO₂e per site (when combined with grid factors or EACs)
Key Benefits of Tracking kWh Delivered per Charger
– Simple, comparable KPI across sites and hardware models
– Strong link to commercial performance (revenue and margin)
– Helps forecast expansion needs and prioritize investments
– Enables proactive maintenance by spotting abnormal declines
– Supports better planning for load balancing and capacity limits
Limitations to Consider
– High kWh does not always mean good user experience (could indicate long dwell times and poor turnover)
– Comparing AC and DC chargers directly can be misleading due to different power levels and use cases
– Power throttling, site limits, and dual-port sharing can hide latent demand
– Data accuracy depends on metering quality and consistent session reporting
– Seasonal patterns can create false alarms without trend context
Related Glossary Terms
Charging Revenue Analytics
Charger Utilization
Charging Session
MID Metering
OCPP
Load Balancing
Energy Throttling
Charger Uptime