🇨🇦 Canada Battery Backup Sizing Calculator
Home battery backup sizing calculator for Canadian power outages. Select the essential loads you need to power during a blackout and outage duration to find the recommended battery size in kWh for your household.
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Resultat
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Avis : Avis : Ce calculateur utilise les regles publiques en vigueur a la date indiquee. Les resultats sont a titre informatif uniquement. Verifiez aupres des sources officielles. Derniere verification: 1 avr. 2026.
Formule
Adds up the wattage of all essential appliances you select, multiplies by the outage duration in hours, then divides by the battery depth of discharge (typically 90% for lithium-ion) to recommend the minimum usable battery capacity.
Questions Frequentes
How many Tesla Powerwalls do I need for my Canadian home?
For essential backup (fridge, lights, furnace fan, internet, sump pump), one Powerwall (13.5 kWh) provides 24 to 36 hours of backup. For whole-home backup including cooking and laundry, most Canadian homes need 2 to 3 Powerwalls (27 to 40.5 kWh). If you have a heat pump as your primary heating source, add one additional Powerwall for winter outages.
How much does a home battery system cost in Canada?
A single Tesla Powerwall (13.5 kWh) costs approximately $12,000 to $14,000 installed in Canada. An Enphase IQ Battery 5P (5 kWh) costs $6,000 to $7,000. A two-Powerwall system runs $22,000 to $26,000. The Greener Homes Grant does not currently cover battery storage, but some provincial programs may offer incentives.
How long do power outages last in Canada?
The average Canadian power outage lasts 4 to 6 hours. However, major ice storms and wind events in Ontario, Quebec, and Atlantic Canada can cause outages lasting 24 to 72 hours or longer. Rural areas experience longer average outages (7 to 12 hours) than urban areas (2 to 4 hours). The 2022 Ontario derecho left some areas without power for over a week.
Can a battery backup run a furnace during a winter outage?
A gas or oil furnace requires electricity only for the fan blower and controls, typically drawing 400 to 600 watts. A single 13.5 kWh battery can run a furnace fan for 22 to 34 hours. An electric furnace or heat pump draws 3,000 to 5,000 watts and would drain the same battery in 3 to 4 hours, making a larger battery system or generator necessary for electric heating.
Should I pair batteries with solar panels in Canada?
Pairing batteries with solar provides energy independence and protection against outages. During a multi-day outage, solar panels recharge batteries during the day. A 10 kW solar system can fully recharge a 13.5 kWh Powerwall in 3 to 5 hours of good sunlight. Without solar, a battery provides only one-time backup until grid power returns.
What essential loads should I back up during an outage?
Priority loads include the refrigerator (150W average), furnace fan (500W), sump pump (800W when running), internet router (15W), LED lighting (100W total), and phone charging (20W). These essential loads total approximately 400 to 500 watts average draw, or 10 to 12 kWh per day. A single 13.5 kWh battery handles these loads for over 24 hours.
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