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Does your building have enough electrical capacity for EV chargers?

Short answer

Often, yes, for a first phase of chargers. Many buildings have spare capacity, especially overnight when most residents charge. A licensed electrician or engineer can confirm it with a load calculation or a review of the building’s actual usage. If capacity is tight, load sharing can divide the available power across several chargers, which the National Electrical Code allows. EZ EV chargers do this dynamically through the cloud, so a costly panel or service upgrade is often avoidable.

Why capacity is the first question

Every charger draws power from the building’s electrical service. Before choosing how many chargers to install or where to put them, the board needs to know how much power is available at the panels near the parking, and how much is left over at the main service.

How capacity is checked

  • A load calculation by a licensed electrician or engineer, based on what the building’s electrical system is designed to carry.
  • Actual usage data. Utility demand data or metering can show how much power the building really uses, and when. Many buildings use far less at night, when most EV charging happens.
  • A walk of the electrical rooms and parking areas to find panels with space and practical routes to the spaces.

What load management does

Load management, also called power sharing or an energy management system, lets several chargers share a fixed amount of power. When only one car is charging, it gets full power; when several are charging, the system divides the power between them so the total never exceeds the limit that was set.

The National Electrical Code (section 625.42) allows the electrical design to be based on the limit set by the load management system rather than on every charger running at full power at once. That can make it possible to install more chargers on the same service. Your electrician and the local building department confirm what is allowed for your site.

Because most residents park for many hours overnight, shared power usually still gives each car enough charge by morning.

When an upgrade is really needed

  • The panels near the parking have no space or capacity, and there is no practical route from another panel.
  • The planned number of chargers is larger than load management can reasonably support.
  • The building’s main service is already close to its limit during the hours chargers would be used.

Upgrades involve the electric utility and can take time, so it pays to plan them early, alongside a long-term charging plan.

Plan for growth, not just the first charger

The first few chargers are rarely the last. A plan for how the building’s power will be shared as more residents switch to EVs avoids first-come, first-served use of capacity and repeated construction. It also gives the board a fair answer when owners ask to install their own chargers. See unapproved EV chargers in a condo garage.

How EZ EV dynamic load sharing works

EZ EV chargers talk to each other through the cloud and balance power across the group in real time:

  1. A maximum is set. We set a maximum current for the group of chargers based on what the panel can supply.
  2. Chargers run at full power until the limit is reached. With only a few cars plugged in, each charges at its full rating.
  3. Power is shared when demand rises. When another car plugs in, the active chargers throttle down in proportion to their ratings so the total never exceeds the maximum.

Example: a 100-amp supply serves four chargers. Chargers A and B are rated at 30 amps and C and D at 40 amps. With A, B and C charging, they use 30 + 30 + 40 = 100 amps. When a car plugs into D, A and B drop to 21 amps and C and D run at 29 amps: still 100 amps in total, with every car charging.

Our software can also set limits by station group, schedule charging for cheaper off-peak hours, and show real-time energy use by location and station. Because most residents park overnight, shared power still gives each car a useful charge by morning.

How EZ EV Energy helps

Our free site assessment looks at your parking, the electrical service and existing panels, and your goals. We set up load sharing so you can add chargers without overloading the building, and we plan how incoming power is shared so access stays fair as more residents switch to EVs. All EZ EV programs use Level 2 charging, which suits residents who park overnight.

Related: how much it costs to install EV chargers.

Get a free site assessment

We review your parking, electrical capacity and goals, then send a written proposal: equipment options plus EZ EV software and billing terms to share with your board.

Request a free assessment or call (561) 299-1166

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Updated November 2026.