Home EV Charger Charger Utilization Calculator

1. Enter monthly sessions
Count completed charging sessions across the ports being evaluated.

2. Enter average session duration
Use connected or actively occupied hours consistently for every session.

3. Set available hours
Enter the hours each port is available during the month, excluding planned closures if appropriate.

4. Enter the number of ports
Count independent ports that can charge vehicles at the same time.

5. Review utilization
Compare occupied port-hours with total available port-hours and remaining capacity.

Occupied port-hours = Sessions × Average hours per session Available port-hours = Available hours per port × Number of ports Utilization (%) = Occupied port-hours ÷ Available port-hours × 100

The calculation assumes the average session duration is representative and that sessions do not occupy more ports simultaneously than are available.

What the result means

Utilization is the percentage of available port time occupied during the measurement period.

High connection-time utilization may overstate active charging if vehicles remain plugged in after reaching their target charge.

Given: 20 sessions per month, 5 hours per session, 720 available hours per port, and 1 port.

Calculation: Occupied hours = 20 × 5 = 100 port-hours. Available hours = 720 × 1 = 720 port-hours. Utilization = 100 ÷ 720 × 100 = 13.89%.

Result: Charger utilization is approximately 13.89%.