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Calculator · E-503

EV parkade capacity calculator

How many chargers a building’s spare capacity supports at full power, how many it supports under load management, and the energy each stall gets overnight.

EV parkade capacity · E-503Metric · SI
kW
From a qualified load study. Do not enter kVA as kW without accounting for power factor.
kW
A 32 A charger at 208 V is about 6.66 kW.
stalls
kW
Your design choice: the floor the system never goes below.
h
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Get this scope priced →

Planning estimate only. The code-compliant load calculation and design are done by a qualified person.

CCT 01How it works

Without an energy management system, every charger counts at its full rating; in apartment-type buildings EV supply equipment is taken at 100% when calculating suite feeders1. So chargers supported = spare kW ÷ charger kW.

With load management, the simultaneous charger count = spare kW ÷ the minimum active charging power. Energy per requested stall overnight = spare kW × hours ÷ stalls (capped at what one charger can deliver). When the requested stall count exceeds the simultaneous count, the energy estimate assumes a compatible system can rotate charging among stalls through the full window; it is not a promise that every stall charges continuously.

CCT 02Assumptions and limits

  • Loads are treated as simultaneous. In practice not every car charges every night, which is exactly what load management exploits.
  • A charger whose current setting a user can change without an electrician must be counted at its maximum2.
  • Billing each stall for energy by the kWh brings in Measurement Canada requirements; see condo board EV charging.

Questions people ask

How many EV chargers can our condo parkade support?

It depends on spare capacity, not stall count. Put the spare kW from a load study above: without load management it is spare kW ÷ charger kW; with it, many more chargers share the same capacity. Read EV charging for condos.

Is 1.4 kW per car enough?

Over a 10-hour night that is 14 kWh, which covers many daily commutes. The calculator shows kWh per stall for your inputs; Calgary winters raise consumption.

Do we need an engineer?

For a building-wide installation, a load study and design are usually the first step, and larger services need drawings. See engineer vs contractor.

Sources

  1. STANDATA bulletin 24-ECB-008 Circuit loading and demand factorsAlberta Municipal Affairs · April 2025
  2. STANDATA interpretation 24-ECI-086 Electric vehicle charging systemsAlberta Municipal Affairs · April 2025