What cold actually does
Electric vehicles work in Edmonton winters. Thousands of them get through January here every year. But cold changes how they charge and how far they go, and knowing why helps you set up your home charging properly.
Lithium-ion batteries do not like to charge quickly when they are very cold. When you plug in a cold-soaked car, it first spends energy warming the battery, then ramps up its charging rate. On a slow Level 1 cord, a big share of the power can go into warming rather than charging, so the battery may barely gain overnight at -30 C.
Range also drops in cold weather. The battery delivers less usable energy when cold, and heating the cabin takes a lot of power. Short trips with lots of reheating are the hardest on range. A long, steady highway drive is easier.
Why Level 2 matters more in winter
In summer, a 120 V cord can be enough for a short commute. In January it often is not. A Level 2 charger has enough power to warm the battery and still put real energy into it, and to preheat the cabin before you leave without draining the battery.
If you are deciding between the two, read Level 1 vs Level 2 EV charging at home. For most fully electric cars that park outside in Edmonton, we recommend Level 2.
Do not run a charger through an extension cord or plug it into a shared block heater outlet on a post. These are not built for hours of continuous load and are a common source of melted plugs. A dedicated circuit is the safe answer.
Setting up an outdoor charger for snow and plows
Many Edmonton homes have a detached garage off the lane or a front driveway with no garage at all. An outdoor charger is perfectly workable, as long as it is set up for our conditions.
- Choose equipment rated for outdoor use and for the temperatures we actually see. Check the charger's specifications for its cold-weather rating.
- Mount it above the snow line. Think about where the windrow lands when the lane is plowed and where you pile snow when you shovel.
- Plan the cable. Cold cables get stiff. A holster and hook keep the connector out of slush and ice, and a cable long enough to reach the charge port without stretching saves a lot of frustration.
- Protect it from impact. A bollard or a careful location keeps a sliding car or a plow blade from taking it off the wall.
- Think about light. A light near the charger makes plugging in at 6 p.m. in December much easier. See outdoor and security lighting.
Underground runs to a detached garage need to be installed at the depth and with the protection the code requires, which depends on the wiring method. That is part of the design and permit work.
Winter charging habits that help
Your equipment is only half the story. A few habits make a big difference on cold days:
- Plug in every night, even if you have plenty of range. Being plugged in lets the car keep its battery in a healthier temperature range and preheat using grid power.
- Set a departure time in the car or charger app. Most EVs will then warm the battery and cabin so they are ready right when you leave.
- Schedule charging for overnight. House load is lower then, which is especially helpful if you have load management.
- Park in the garage when you can. Even an unheated attached garage is warmer than the driveway on a windy night.
- Leave a margin. On the coldest days, plan for less range than the dashboard promised in September.
Chinooks, ice and the freeze-thaw cycle
Edmonton does not get the big chinooks Calgary does, but we still get mild spells that melt snow and refreeze it overnight. Meltwater can run down a wall, drip onto connectors and freeze. A charger mounted under a roof edge with no eavestrough is a common example.
Look at where water goes on the wall before you pick a spot. Keep the charger away from downspouts and roof drip lines. If ice is building up on your roof edge too, that is a separate problem we can help with through roof and gutter de-icing.
If the connector ever freezes into the car's charge port, use the car's port-heating or defrost feature if it has one, or wait for it to thaw. Do not pry it or pour hot water on it.
Signs something needs attention
Call a licensed electrician if you notice any of these:
- The charger's breaker trips repeatedly, especially in cold weather.
- The cable jacket is cracked, split or flattened from being driven over.
- The charger shows a ground fault or error code that keeps returning.
- Any part of the plug, cable or wall unit feels hot or smells like burning.
Resetting a tripped breaker once is fine. If it trips again, leave it off and call. Our home EV charger team can check the circuit and equipment, and we answer the 24/7 line at 1 (800) 716-8955.
Common questions
Is it bad for my EV to sit outside at -30 C?
Modern EVs are designed for it, but they work best when plugged in. Being connected lets the car manage its battery temperature using grid power instead of the battery itself.
Why does my car charge so slowly on cold nights?
A cold battery has to be warmed before it will accept a full charging rate. On Level 1, most of the available power can go into warming. Level 2 and parking in a garage both help.
Can I put my charger in my unheated detached garage?
Yes, as long as the charger is rated for the temperature range and the circuit to the garage is properly sized. Detached garages often need an underground feed or a subpanel, which we design and permit.
Do I need to cover my outdoor charger in winter?
An outdoor-rated charger does not need a cover. What matters more is mounting height, cable storage and keeping it out of the way of meltwater, plows and snow piles.
Codes and permit rules change and every building is different. For work on your system, talk to a licensed electrician and your local permit authority.