How do I future-proof my garage electrical for a second EV charger down the road?

The smartest move is to have your electrician install a sub-panel in your garage with enough capacity for two chargers during your first installation — adding the extra capacity now costs a fraction of what it would cost to run a second line later. Planning ahead can save you $1,500-$3,000 compared to doing two completely separate installations.

When your electrician installs your first EV charger, ask them to run a larger feeder cable to a garage sub-panel instead of a single dedicated circuit. A typical single EV charger installation uses a 50A circuit with 6-gauge wire. Instead, your electrician can run a 100A feeder with 3-gauge or 2-gauge wire to a 100A sub-panel in the garage, then feed your first charger from that sub-panel. The incremental cost for the larger wire and sub-panel is typically $800-$1,500 more than a single circuit installation — far less than running a completely new line from the house to the garage later. When you're ready for the second charger, your electrician simply adds a new breaker and short wire run within the garage from the existing sub-panel.

However, this strategy only works if your main panel has enough total capacity. Two Level 2 EV chargers drawing 40A each means 80A of additional load on your home's electrical system. Combined with your existing loads — central AC (30-40A), electric range (40-50A), dryer (30A), and general household circuits — this can easily exceed a 200A panel's capacity. Your electrician will perform a detailed load calculation following the Ontario Electrical Safety Code to determine what your panel can actually support. In many GTA homes with 200A service, two chargers are feasible with careful load management, but some homes may need to consider alternatives.

Load-sharing devices are an increasingly popular solution for two-charger households. These devices monitor your panel's total draw and dynamically split available capacity between two chargers. When one car is fully charged or not connected, the other gets full power. When both are charging simultaneously, each gets a reduced but still functional charge rate. Products like the DCC-10 or built-in load sharing in chargers like the Tesla Wall Connector can allow two chargers to share a single 60A circuit, eliminating the need for a panel upgrade entirely. Installed cost for a load-sharing setup is typically $500-$1,000 on top of the charger installations.

At minimum, even if you're not ready to install a sub-panel, ask your electrician to pull a conduit from your panel area to the garage that's large enough to accommodate a second set of wires later. Running empty conduit during the first installation — especially if it involves trenching to a detached garage — adds only $200-$400 but saves the entire trenching cost when you eventually need it.

Your electrician should also consider the placement of your first charger with the second in mind. Position the first charger so there's wall space and electrical access for a second unit beside or near it. If you have a two-car garage, putting the sub-panel centrally between both parking positions keeps both charger wire runs short and cost-effective.

All of this work requires an ESA permit, and the inspector will verify that your load calculations support the planned capacity, your wire sizing is correct for the run length, and all connections are code-compliant. Toronto Electrical Repair can match you with a licensed electrician for free who can plan your garage electrical for both current and future EV charging needs.