A home battery stores electricity so you can use it later, either to keep essential circuits running during a power outage or to shift your electricity use away from expensive times of day. In Canada, most homeowners buy one primarily for backup, with bill savings as a bonus where time-of-use pricing makes it worthwhile. This guide covers how home batteries work, what they cost, where they make sense and what to ask before you buy.
Key takeaways
- A home battery has two key numbers: energy (kWh, how much it stores) and power (kW, how much it can deliver at once).
- Installed costs in Canada typically run roughly $12,000 to $20,000 for a single battery of about 10 to 15 kWh (approximate).
- Batteries pair well with solar but don't require it; many charge from the grid.
- Backup is the most common reason Canadians buy one; savings depend heavily on your province's rate structure.
- Lithium iron phosphate (LFP) chemistry now dominates home batteries thanks to its long life and safety profile.
How a home battery works
A home battery system includes battery modules, an inverter (or a connection to a hybrid solar inverter) that converts stored DC power to the AC your home uses, and a controller or gateway that decides when to charge, discharge and island your home from the grid during an outage.
There are two main ways batteries connect:
- AC-coupled: the battery has its own inverter and connects to your electrical panel. Easy to add to an existing solar system or a home without solar.
- DC-coupled: the battery shares a hybrid inverter with solar panels. Slightly more efficient for solar-charged energy and often chosen for new solar-plus-storage installs.
During a grid outage, a properly configured system disconnects from the grid automatically (a safety requirement that protects utility line workers) and keeps powering your backed-up circuits.
The numbers that matter
| Spec | What it means | Typical home range |
|---|---|---|
| Usable capacity (kWh) | How much energy you can actually draw | ~5–15 kWh per unit, stackable |
| Continuous power (kW) | How much it can supply at once | ~3–11 kW |
| Peak/surge power (kW) | Short bursts for motor starts | Higher than continuous for seconds |
| Round-trip efficiency | Energy out ÷ energy in | ~85–90% |
| Warranty | Years and/or throughput | Often 10 years |
Capacity tells you how long you can run things; power tells you how many things you can run at the same time. A big-capacity battery with low power output may struggle to start a well pump or central air conditioner. See our guide on how to size a home battery for a step-by-step method.
Why Canadians buy home batteries
Backup power
Ice storms, windstorms and summer thunderstorms knock out power across Canada every year, and outages in rural areas can last days. A battery keeps your fridge, furnace blower, sump pump, internet and lights running without fumes or noise. Pair it with solar and you can recharge during the day for extended outages; our article on solar plus battery backup explains how that works.
Shifting to cheaper electricity
Where electricity prices vary by time of day, a battery can charge when power is cheap and discharge when it's expensive. Ontario's ultra-low overnight plan is the clearest Canadian example. Whether the math works for you is covered in Is a home battery worth it?.
Using more of your own solar
In provinces where net metering credits exported solar at full retail value, a battery adds little financial benefit. Where export credits are lower than what you pay for grid power, storing your midday surplus for evening use becomes more valuable.
Helping the grid
Some utilities are piloting programs that pay battery owners to discharge during peak demand. These virtual power plants are still early in Canada but growing.
What does a home battery cost in Canada?
Approximate installed ranges:
- Single battery, ~10–15 kWh: $12,000 to $20,000
- Two stacked units, ~20–30 kWh: $22,000 to $35,000
- Electrical upgrades (panel replacement, critical-loads subpanel): roughly $1,500 to $5,000 extra if needed
Costs vary with brand, installer, how many circuits you back up, and whether you're adding solar at the same time. Incentives exist in some provinces and utilities, often tied to pairing with solar or to specific programs; amounts change, so check our rebate finder by address.
Choosing a battery: what to compare
- Chemistry: LFP batteries offer long cycle life and a strong safety record; some older or compact designs use NMC. We compare the two in a separate article.
- Whole-home vs. partial backup: Some systems can back up an entire 200-amp panel; others serve a dedicated critical-loads panel.
- Cold-weather rating: Lithium batteries shouldn't charge below about 0°C without internal heating. If the unit goes in a garage or outside, confirm its operating range and whether it has a built-in heater.
- Expandability: Can you add modules later?
- Warranty terms: Look at both years and energy throughput, and at the capacity guaranteed at the end of the warranty (often around 60 to 70 percent).
- Certification: Systems should be certified to recognized standards such as UL 9540 and installed under permit. Your installer should handle permits and inspection.
Where should the battery go?
Garages, utility rooms and exterior walls are common locations. Electrical codes restrict batteries from bedrooms and limit how much capacity can sit in certain rooms. Think about:
- Temperature extremes (unheated garages in a Prairie winter can be hard on batteries)
- Flood risk in basements
- Clearance from doors, windows and vehicle paths
- Proximity to your main panel to keep wiring costs down
Frequently asked questions
Do I need solar panels to get a home battery?
No. A battery can charge from the grid and provide backup or time-of-use savings on its own. Adding solar lets you recharge during long outages and use more of your own clean power.
How long will a home battery power my house?
It depends on what you run. A 13 kWh battery might keep a fridge, furnace fan, lights, internet and a sump pump going for roughly a day or more, but electric heating or central air would drain it in hours.
How long do home batteries last?
Most modern home batteries carry warranties of around 10 years, and LFP batteries in particular can often handle several thousand charge cycles. Real lifespan depends on how hard you cycle it and the temperatures it lives in.
The bottom line
Home batteries have become a practical option for Canadians who want quiet, clean backup power and, in some provinces, lower bills. Start by deciding what you need it to do (backup, bill savings or both), size it to your essential loads, choose a certified system suited to your climate and confirm local incentives before you sign. For how a battery fits with other upgrades, see our whole-home upgrade sequence.
Sundamentals is an independent, non-profit education platform. Program details and prices change often — check current programs for your address in our rebate finder.