Why EV Station
Size feeders and transformers for EV charging stations: aggregate connected load, apply a diversity factor, and get feeder current and the next standard transformer kVA.
Mixed chargers
Combine different kW chargers with counts.
Diversity factor
Model load management honestly (0.1–1.0).
3-phase feeder
Current at 400/480 V with power factor.
Transformer ladder
Next standard kVA with sensible headroom.
Load sharing
Per-charger power under a site limit (ALM).
Design current
125% continuous factor for conductor sizing.
How it works
List chargers
kW × count for each type.
Set diversity & voltage
With or without load management.
Read results
Demand kVA, feeder amps, transformer size.
FAQ
What diversity should I use?
1.0 unless a load-management system (EVEMS) actively limits the site — then its guaranteed cap.
Which voltages are supported?
Common 3-phase service voltages, with power-factor input.
Does it size the transformer?
It suggests the next standard kVA with headroom — final selection belongs to the utility/engineer.
Who is it for?
Electrical designers, EPCs and site planners doing early-stage sizing.