Uptime Metric Design

Defining Availability

Developed per-port uptime metrics based on whether charging equipment was both operational and reachable by the charging platform.

Rather than relying on a single status field, the methodology combines several operational signals to provide a more defensible representation of charger availability.

Multiple Reliability Views

Several complementary uptime metrics were implemented to account for different operating conditions and interpretations of charger availability.

This allowed reliability to be analyzed without forcing every operational scenario into a single definition.

Downtime Exclusions

The model incorporates defined reporting periods and approved downtime exclusions so that reliability can be evaluated consistently for operational, customer and reporting use cases.

The methodology was developed in the context of evolving industry and California EVSE reliability requirements while supporting a much broader charging portfolio.