Formula and Method
Current per charger is calculated from kW, voltage, phase, and power factor. Total planned current is multiplied by charger quantity and simultaneity.
Assumptions
- AC chargers
- Balanced three-phase loading when three-phase is selected
- Demand management is represented by simultaneity factor
Important Warnings
- Final EV charging design must check IEC 61851, local code, RCD/RCBO requirements, earthing system, and load management.
- DC fast chargers require a more detailed system study.
FAQ
What is simultaneity factor?
It estimates how much of the installed charging power is used at the same time. Use project-specific demand management data when available.
Does this choose RCD or RCBO type?
No. EV charging residual-current protection depends on charger design, DC leakage handling, local rules, and manufacturer instructions.