Can a 100 Amp Markham Home Add an EV Charger Without a Panel Upgrade?
Often, yes. A 100A service does not automatically mean a panel upgrade. Whether you need one depends on how much electricity your home actually uses, not just the size of the main breaker.
Why quotes jump to a panel upgrade
A Level 2 charger is a continuous load, so the breaker is sized at 125% of its current (a 32A charger needs a 40A breaker). Add that to central air, an electric oven and a dryer using the code's default calculation and a 100A panel can look overloaded. Some contractors then quote a full 200A upgrade by default.
Three alternatives to check first
- Measured-demand calculation. In some circumstances the Ontario Electrical Safety Code lets a licensed contractor rely on measured maximum-demand data for the home instead of the conservative default. Homes with gas heat and gas appliances often have plenty of headroom. The contractor decides if it applies, and the ESA inspection still has to pass.
- EVEMS load management. A device at the panel monitors total household draw and pauses the charger when the home needs the power, then resumes. It is a code-recognized way to avoid overloading the service.
- A smaller charger circuit. A 32A charger on a 40A circuit adds enough range overnight for most commutes and can fit where a 48A unit cannot.
When you should just upgrade
If you plan to add a heat pump, a basement suite or a second EV, a 200A service may be the cheaper long-term answer. In most of Markham the utility is Alectra, and a service upgrade involves them as well as the ESA.
The full cost comparison is on our panel upgrade vs EVEMS page.
Not sure what your panel can handle? Request your free quote or call 1-647-547-4338.
Until your home charger is in, find public stations on the Markham EV charger map, filtered by network and charging speed.
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