40 Amp vs 48 Amp EV Charger

Verdict: 40 amps is enough for most GTA homes; 48 amps wins only when the panel and vehicle support it

A 40 amp EV charger is the practical sweet spot for many Toronto and GTA homes because it charges quickly, fits common Level 2 equipment, and usually has an easier path through a load calculation. A 48 amp charger is faster, but it needs a larger circuit, must be hardwired, and should not be promised until an electrician confirms panel capacity.

The difference is real but not dramatic. At 240 volts, a 40 amp charger delivers about 9.6 kW. A 48 amp charger delivers about 11.5 kW. That is roughly 20% more charging power, if your vehicle can accept it.

That last part matters. The charger does not force power into the car. The car’s onboard charger decides the maximum AC charging rate. If your EV only accepts 32 amps or 40 amps on Level 2, installing a 48 amp wall connector will not make it charge faster.

For most drivers plugging in overnight, 40 amps easily replaces a normal day of driving. For high-mileage drivers, two-EV households, larger battery packs, and vehicles with an 11.5 kW onboard charger, 48 amps can be worth the extra capacity planning.

City Power installs permitted Level 2 EV chargers in Toronto and the GTA, including the load calculation, ESA notification where required, wiring, breaker, charger mounting, and inspection coordination.

The side-by-side answer: 40A is simpler; 48A needs a 60A circuit and more panel headroom

The homeowner-friendly way to compare them is not just charger size. Compare output amps, circuit size, wiring route, charger type, vehicle limit, and panel capacity together.

The most important line in that table is the circuit size. EV charging is a long-duration load. Under the Ontario Electrical Safety Code approach to continuous loads, the circuit must be sized so the EV charging output is not using the full breaker rating for hours at a time.

In plain language: you do not put a 40 amp continuous EV load on a 40 amp breaker. You typically put it on a 50 amp circuit. You do not put a 48 amp continuous EV load on a 50 amp breaker. You typically need a 60 amp circuit.

That is why “40 amp vs 48 amp EV charger” is really “50 amp circuit vs 60 amp circuit.” The charger setting, breaker, conductor size, installation manual, and panel calculation all have to agree.

If you are also comparing connection types, read hardwired vs plug-in EV charger and NEMA 14-50 vs hardwired charger. Those choices affect whether 48A is even on the table.

Charging speed: 48A is faster, but your car may be the limit

A 48 amp charger is faster only when the vehicle’s onboard AC charger can accept 48 amps. Many EVs and plug-in hybrids have lower AC acceptance rates. In those cases, the car will simply draw less than the wall unit can provide.

The basic math is:

• 40A × 240V = about 9.6 kW
• 48A × 240V = about 11.5 kW
• 48A is about 20% more charging power than 40A

That extra power helps most when the car arrives home with a low battery and needs to be ready again the next morning. It is less important if you usually plug in at 7 p.m., leave at 7 a.m., and only need to replace a normal commute.

Vehicle acceptance rate is the first thing to check before paying for a larger circuit. Look at the EV manual, charger app, vehicle settings, or manufacturer specifications for maximum AC charging. Some cars can use 48A. Some top out at 40A, 32A, or lower.

The onboard setting matters too. Many EV chargers allow the installer to set the maximum current. That setting must match the circuit. For example, a charger capable of 48A may be commissioned at 40A, 32A, or another approved setting if the circuit or panel cannot support the maximum.

This is also why a bigger wall unit is not automatically wasteful. You may buy a charger capable of 48A and set it lower today, then increase it later if the panel is upgraded and the wiring is sized correctly. But that must be planned at installation, not guessed after the wall is closed.

For a broader charger-type comparison, see Tesla Wall Connector vs Universal Charger.

Panel capacity: a 48A charger should never be promised before a load calculation

A 48 amp charger should be approved only after a proper load calculation confirms the home has capacity for a 60 amp EV circuit. This is the step that protects you from nuisance tripping, overloaded service equipment, and a failed ESA inspection.

A load calculation looks at the electrical service size and the major loads in the home. In a GTA house, the important items are usually:

• Existing service size, often 100A or 200A
• Electric range, dryer, oven, cooktop, or hot tub
• Air conditioning, heat pump, electric heat, or sauna
• Basement apartment loads, second kitchen, or added laundry
• Existing subpanels and garage circuits
• Space in the panel is not the same as capacity

That last point is where many homeowners get caught. A panel may have an open breaker space, but the service may still be too loaded for a 60A EV circuit. The breaker physically fitting in the panel does not prove the service can carry the load.

On a lightly loaded 200A service, 48A may be straightforward. On a 100A service with electric cooking, dryer, air conditioning, and other large loads, it may not be. Sometimes the right answer is a 40A charger. Sometimes it is a lower setting. Sometimes it is a load-management device. Sometimes it is a service upgrade.

If you are starting with a 100A panel, read can I run an EV charger on a 100 amp panel?. If the load calculation points toward a larger service, see should I upgrade from 100-amp to 200-amp service?.

Published pricing from City Power’s price sheet: a straightforward Level 2 installation in the GTA — panel nearby, capacity available — runs $800–$1,500 for labour, materials, and the ESA permit. For a 40 amp or 48 amp EV charger, longer cable runs or finished-wall routing can raise installation to $1,500–$3,500, plus $500–$1,200 for the charger. Most 40 amp or 48 amp EV charger projects end up around $1,500 to $3,000 total. When panel capacity is limited, load management can often make a 40 amp or 48 amp charger work without an upgrade; if not, a 200A upgrade ($3,200–$4,500) can be completed with the installation.

When each option wins: choose 40A for practicality, 48A for faster recovery with confirmed capacity

A 40 amp charger wins when you want reliable overnight charging without forcing a larger electrical project. It is often the right choice when the panel is already busy, the vehicle does not accept more than 40A, or the wire route is long and finished.

Choose 40A when:

• Your EV’s Level 2 acceptance rate is 40A or lower
• You mostly charge overnight
• You drive a normal daily distance and start each morning full enough
• Your 100A or 200A service has limited spare capacity
• A load-management device or lower charger setting makes more sense than a service upgrade
• You want the most practical balance of speed, cost, and approval path

A 48 amp charger wins when the whole system supports it. That means the EV can accept 48A, the charger is rated and configured for 48A, the circuit is sized correctly, and the load calculation leaves enough room.

Choose 48A when:

• Your vehicle accepts 48A AC charging
• You regularly arrive home with a deeply depleted battery
• You have long daily mileage or unpredictable driving schedules
• Two EVs share the home and one needs fast overnight recovery
• Your panel has confirmed capacity for a 60A EV circuit
• You are already planning a panel upgrade or major electrical work

The mistake is choosing 48A just because it is the largest common residential setting. Bigger is not always better if it triggers service work you do not need, or if the car cannot use the extra current.

The other mistake is undersizing because of a guess. If the garage is far from the panel, the route crosses finished basement ceilings, or the service is near its limit, the installation should be quoted in writing after a site visit. That is when we verify the panel, grounding, breaker compatibility, wire route, charger manual, and ESA requirements.

What we recommend for a GTA home: install the largest charger your car can use and your panel can safely support

For most GTA homes, we recommend starting with the vehicle’s maximum AC charging rate, then confirming the home’s electrical capacity. If the car maxes out at 40A or less, a 48A circuit usually does not help. If the car can use 48A and the panel calculation supports it, a hardwired 48A charger is a strong long-term choice.

Our practical recommendation is:

• If the home easily supports a 50A circuit, 40A charging is an excellent default.
• If the home easily supports a 60A circuit and the EV accepts 48A, choose 48A.
• If capacity is tight, consider a lower charger setting or load management before jumping to a panel upgrade.
• If the service is old, crowded, damaged, or undersized, solve that first.

An EV charger installation in Ontario is not just mounting a box on the wall. The work may require an ESA notification, correct breaker type, correct conductor size, outdoor-rated equipment where applicable, proper support and protection for the cable, torqueing terminations to manufacturer specs, commissioning the charger at the right amperage, and inspection where required.

City Power Electrical Services installs 40 amp and 48 amp EV chargers as a licensed electrical contractor, ECRA/ESA #7015314. We provide free written estimates, install EV circuits with ESA permits where required, and clean up when the work is done. We serve Toronto, North York, Scarborough, Etobicoke, Mississauga, Brampton, Markham, Vaughan, Richmond Hill, Oakville, Burlington, Pickering, Ajax, Whitby, Oshawa, and the GTA.

If you are deciding between 40A and 48A, the safest next step is a site assessment. We check the panel, calculate the load, confirm the charger and vehicle limits, and quote the correct installation in writing. You can also review EV charger install day: what to expect before booking.