EV load management

EV energy management systems for Edmonton homes and buildings: load calculations, smart chargers and load managers that share capacity safely and avoid service upgrades.

The problem it solves

Many Edmonton homes have 100 A services, and some older ones have 60 A. Add an electric range, dryer and hot tub, and there may not be room for an EV charger at full power when everything runs together. The same is true in condo parkades and commercial buildings: there is spare capacity, but not enough for every charger at once.

Load management solves that by watching the total load and adjusting charging in real time. Most of the day and night, the house or building uses far less than its peak, and the EV can charge at full speed. When the load climbs, charging slows down or pauses until it drops again.

It is a little like a dimmer switch that watches the rest of the house. The charger gets whatever capacity is left over, up to its maximum, and never pushes the total over the limit your service can safely carry.

What the code allows

The Canadian Electrical Code recognizes EV energy management systems. When one is installed and set up properly, the load calculation can be based on the managed load rather than the charger's full rating. That is what lets a charger be added without a service upgrade in many cases.

The details matter: the equipment must be certified for the purpose, the settings must match the calculation, and the inspector will want to see that it is installed as designed. We do the load calculation, select the device, install it and document the settings for the permit.

Options for homes

• Stand-alone load manager: current sensors on your service feed a controller that switches or throttles the charger circuit.
• Smart charger with load sensing: some chargers accept sensor inputs and adjust their own current.
• Load-shedding device: pauses the charger while another large appliance, such as a dryer or range, is in use.
• Charger sharing: two chargers share one circuit and split the current between two vehicles.

Which option fits depends on your panel, the loads in the house and the charger you want. If a service upgrade is already on your list for other reasons, such as a heat pump or a renovation, it may still be the better long-term answer. We will lay out both.

We also check how the vehicle itself handles reduced current. Most modern EVs adjust smoothly, but a few older models or chargers behave better with certain settings, and we test before we leave.

Options for buildings

In multi-unit and commercial buildings, networked chargers share a set amount of power among all connected vehicles. Software decides who gets how much, often by first come, first served or equal share, with a hard limit that protects the building service. This is how parkades add dozens of chargers without a new service.

For mixed buildings, the load manager can also watch the building's main feed and reduce charging when the building load peaks, such as on a cold weekday morning.

What drives cost

Cost depends on the type of device, how far it is from the panel and charger, whether the charger supports load management natively, network subscription fees for building systems, and the number of chargers sharing capacity. Compared with a service upgrade, load management is often much less disruptive, but we will recommend whichever is right for your situation.

For buildings, also consider the ongoing network fees and how the system will be administered. A simple setup that the property manager understands is worth more than a feature-rich one nobody uses.

Questions we hear