What EV charger amperage should I choose for a Calgary home — 40 amp or 60 amp?

For most Calgary homeowners, a 48-amp charger on a 60-amp circuit is the best long-term investment, but a 40-amp charger on a 50-amp circuit works perfectly well for daily driving and costs less if panel capacity is tight. The right choice depends on your panel capacity, your vehicle, your daily driving distance, and whether you might add a second EV in the future.

Let's start with the numbers. A 40-amp charger on a 50-amp circuit delivers approximately 9.6 kW of power, adding roughly 40 to 48 kilometres of range per hour of charging. Over a 10-hour overnight window (10 PM to 8 AM), that is 400 to 480 kilometres of range replenished — more than enough for any daily commute in the Calgary area, even accounting for the 30% to 50% winter range reduction from cold weather. A 48-amp charger on a 60-amp circuit delivers approximately 11.5 kW, adding roughly 48 to 58 kilometres per hour. Over the same 10-hour window, that is 480 to 580 kilometres of replenished range.

The practical difference for daily driving is minimal. If you drive 60 kilometres per day (a typical Calgary commute from, say, Cranston to downtown and back), the 40-amp charger replaces that energy in about 90 minutes, while the 48-amp charger does it in about 75 minutes. Both finish well within an overnight charging window. The 48-amp advantage becomes more meaningful if you drive 150 or more kilometres per day, if you need to top up quickly between trips, or if you frequently arrive home with a very depleted battery.

Panel capacity is often the deciding factor in Calgary. A 60-amp circuit requires a 60-amp double-pole breaker and 4-gauge copper NMD90 wire (or 6-gauge TECK cable for outdoor/exposed runs). A 50-amp circuit requires a 50-amp breaker and 6-gauge wire. The wire cost difference is noticeable — 4-gauge copper wire costs roughly $3.50 to $4.50 per metre, while 6-gauge costs $2.00 to $3.00 per metre. On a 15-metre run, that is a difference of approximately $25 to $45 in wire alone. More importantly, the 60-amp breaker occupies 60 amps of panel capacity versus 50 amps for the smaller circuit. In homes with 200-amp panels in newer communities like Mahogany, Seton, or Auburn Bay, this 10-amp difference is usually insignificant. But in older Calgary communities with 100-amp panels — or even 200-amp panels that are heavily loaded with central AC, a hot tub, electric range, and dryer — those 10 amps of headroom can make the difference between a simple installation and a costly panel upgrade.

Future-proofing favours the 60-amp circuit. If you might add a second EV in the future, a 60-amp circuit with a charger that supports power sharing (like the Tesla Wall Connector) can split power between two vehicles overnight. EV battery sizes are also growing — newer EVs with 80 to 100+ kWh batteries benefit more from the faster 48-amp charging speed. And most importantly, the incremental cost of running 4-gauge wire instead of 6-gauge during initial installation is far less than pulling new wire later.

My recommendation for Calgary homeowners: If your panel has capacity and you are installing fresh wiring, go with the 60-amp circuit. The additional cost is $100 to $300 compared to a 50-amp circuit, and you get maximum flexibility for current and future vehicles. If your panel capacity is limited and a 60-amp circuit would trigger a panel upgrade, a 40-amp charger on a 50-amp circuit is perfectly adequate for daily driving — save the panel upgrade money for when it becomes truly necessary. A licensed electrician performing a load calculation will tell you exactly which option your panel supports. Calgary Electrical Services can match you with electricians who specialize in EV installations through the Calgary Construction Network.