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Battery backup sizer

How big a home battery do you need?

Pick what has to keep running when the power goes out and how long outages last where you live. We size the battery in usable kWh and give a typical installed cost range.

Essentials to keep running

Outage length to plan for

Running hours are typical daily duty cycles: a fridge's compressor runs on and off, so it averages far below its peak draw.

Battery you need

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Typical setup
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Peak power
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Typical installed cost
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Includes a 15% allowance for inverter losses and reserve. Costs are typical Canadian installed ranges before rebates; get quotes for your home.