Can my EV charger keep working during a Toronto power outage if I have a generator?

Your EV charger can work during a power outage if you have a properly sized standby generator or portable generator with a transfer switch, but the generator must be large enough to handle the charger's substantial power draw — and most portable generators are not. After the 2013 Toronto ice storm left hundreds of thousands without power for days, many GTA homeowners have invested in backup power, and EV charging during outages is an increasingly common consideration.

A standard Level 2 EV charger draws 7.2 to 9.6 kW continuously. To run your charger from a generator, you need a unit rated for at least that output plus your home's essential loads (refrigerator, furnace blower, sump pump, lighting). In practical terms, this means a whole-home standby generator rated at 16-22 kW is the minimum to comfortably support EV charging alongside essential household circuits during an outage. These natural gas or propane-powered generators start automatically when the power goes out and connect through an automatic transfer switch (ATS) that isolates your home from the grid. A complete standby generator installation in the GTA runs $8,000-$15,000, including the generator, concrete pad, automatic transfer switch, gas line (TSSA permit required), electrical connection (ESA permit required), and all inspections.

A portable generator is generally not practical for EV charging. Most portable generators produce 3,000-7,500 watts — not enough to run a Level 2 charger while also powering essential loads. You could theoretically charge at Level 1 (standard 120V outlet, drawing about 1.4 kW) from a portable generator, but Level 1 adds only 6-8 km of range per hour, making it impractical for anything more than emergency top-ups. If you do use a portable generator with a manual transfer panel, your electrician can set up the transfer panel so the EV charger circuit is one of the selectable circuits — but you'd need to shed other loads to free up enough capacity.

Generator sizing for EV charging requires careful calculation. Your electrician will perform a load calculation that accounts for the EV charger plus all essential loads you want powered during an outage. A realistic breakdown for a GTA home might look like: furnace blower and controls (500-800W), refrigerator (200-400W), sump pump (800-1,200W), essential lighting and outlets (500-1,000W), and EV charger at reduced rate (3,600-7,200W). This totals 5,600-10,600W minimum, pointing to a 12-16 kW generator as the practical floor for EV charging capability during outages.

Some homeowners take a different approach entirely and ask about using their EV as a backup power source for their home — known as vehicle-to-home (V2H) technology. Some newer EVs, including the Ford F-150 Lightning and certain Hyundai/Kia models, can export power from the vehicle's battery back to the home through a bidirectional charger. This technology is still emerging in Canada and requires specific bidirectional charging equipment, but it's a growing area of interest in the GTA market, especially after ice storm experiences.

Both generator installation and EV charger circuits require separate ESA permits and inspections. If you're installing both simultaneously, your electrician can coordinate the permits and design the system holistically — ensuring the transfer switch, generator, and charger all work together seamlessly. The TSSA gas permit for the generator's fuel connection is a separate requirement handled by a licensed gas fitter, often coordinated by your electrical contractor.

If you're considering backup power that includes EV charging capability, Toronto Electrical Repair can match you with a licensed electrician for free who can design an integrated system for your home.