FindSolar.caAn electric car turns your driveway into your fuel station, and your roof can be the refinery. The math connecting them is friendlier than most owners expect: a typical Canadian driving year adds a modest, predictable load that a few extra panels cover. The nuance worth understanding is not how many panels, but how the timing of charging interacts with what your province pays for solar.
From kilometres to kilowatts
Most EVs consume roughly 15 to 22 kWh per 100 km in Canadian conditions once winter and charging losses are counted, on planning figures. Drive 15,000 km a year and you are adding roughly 2,500 to 3,300 kWh; drive 25,000 and it approaches 5,000. Divide by your region's production of roughly 950 to 1,300 kWh per installed kW and the answer lands near 2 to 4 kW of extra array for a typical driver: about five to eight additional panels. Our calculator lets you fold that into your bill before quoting.
The overnight-charging question
Most charging happens at night, when panels produce nothing, and newcomers worry this breaks the case. Under net metering it does not: your daytime exports earn credits that pay for the overnight charge, and the grid plays battery. The arithmetic only changes where exports earn well below retail; there, a smart charger that shifts charging into the solar window, or midday workplace-free charging habits, keeps more of your solar at full value. Some tariffs even make overnight the cheap window regardless, which is a bill question, not a solar question.
Outages, batteries and the honest limits
A home battery can keep essentials running for days, but an EV is a hungry passenger: even modest Level 2 charging draws more than most home batteries sustain for long. During an outage, treat the car as transport with its own large battery, not as a load to serve. Vehicle-to-home hardware that reverses the relationship is emerging in Canada, and worth asking about as equipment matures, but should not anchor today's purchase.
Sequencing the driveway and the roof
If the EV is confirmed, size solar for it now: panel space is cheapest while the crew is already on the roof, and the sizing guide covers how concrete plans, not vague ones, earn panels. If the EV is a someday, run conduit for the charger, leave inverter headroom, and add rows when the car is real. Either way, tell the designer about the driveway; the roof should know what the garage is planning.
Questions homeowners ask
How many solar panels does it take to charge an electric car?
A typical 15,000 km Canadian driving year consumes roughly 2,500 to 3,300 kWh including winter and charging losses, on planning figures. That is about 2 to 3 kW of extra array in most regions, or five to eight modern panels. Heavy drivers scale up proportionally.
Can I charge my EV directly from my solar panels?
Functionally yes, in the sense that midday charging consumes your solar as it is produced. Electrically, the house, array and grid share one connection and electrons are not labelled. Smart chargers can prioritize the solar window, which matters most where export credits pay below retail.
Should I add extra solar now if I plan to buy an EV later?
If the car is decided, yes: add its expected kWh to your usage and size once. If it is a maybe, pre-wire the charger circuit, keep inverter headroom, and expand later. Concrete plans earn panels now; vague plans earn conduit.
Does charging at night cancel out the benefit of solar?
Not under net metering: daytime exports bank credits that pay for the overnight charge, so the timing mismatch costs you little. Where exports earn well below retail, shifting charging into daylight with a smart charger preserves more value. Check your province's crediting rules to know which case is yours.
Can a home battery charge my EV during a power outage?
Technically, briefly, and mostly inadvisably: EV charging draws more than most home batteries can sustain while also running your house. In an outage, the car is best treated as transport with its own big battery. Keep the home battery for the fridge, heat circulation and lights.
Is solar cheaper than charging my EV from the grid?
Over the system's life, solar's cost per kWh on planning figures commonly lands below residential retail rates, which is the comparison that matters for home charging. The exact answer depends on your tariff and province. Either way it beats gasoline by a distance, which is the comparison your wallet already made.