Battery or generator?
Start with your needs.

Two ways to supply backup power.

A home battery stores electricity. A standby generator produces electricity from fuel, commonly natural gas or propane. Both need a properly designed electrical arrangement to supply supported household circuits during an outage. Automatic operation depends on the complete equipment and controls.

This guide compares permanently installed standby systems. Portable generators have different operating arrangements and are not treated as equivalent installations.

Compare the practical tradeoffs.

Outage duration

A battery’s runtime is limited by available stored energy and demand unless an approved charging source is available. A generator can be useful for longer outages while suitable fuel remains available and the equipment can operate within its service requirements. Neither option guarantees uninterrupted operation.

Starting and running loads

Both must be sized for simultaneous demand and motor starts. Battery energy in kWh does not establish inverter output in kW. A generator’s output rating does not tell you how much fuel it will use at your actual load.

Everyday use

A suitably configured battery may shift grid energy on an appropriate time-of-use plan. A standby generator is principally an outage option; do not assume running it for routine rate shifting will save money. Compare fuel, servicing and operating restrictions.

Fuel, sound and siting

A battery does not burn fuel while supplying electricity, but can have fans and equipment noise. A combustion generator needs fuel and an outdoor location that meets its exhaust, clearance and noise requirements. Check actual model data and local siting requirements for either choice.

Ownership and upkeep

Ask for equipment-specific maintenance, inspection, warranty and expected replacement requirements. Compare a complete installed proposal and ongoing costs; no universal installed price or payback applies to every home.

Which deserves a closer look?

A battery may suit a household prioritising selected-load backup and possible daily energy shifting, with a plan for what happens when stored energy runs low. A standby generator may deserve closer evaluation where long outages and sustained loads are the main concern and suitable fuel supply and siting are practical.

Some engineered systems can combine a battery and compatible generator. Compatibility, controls and recharging behaviour must be confirmed in writing; do not assume any generator can connect to any battery.

Ask the same questions of both proposals.

• Which circuits are supported, and which loads must remain off?
• What running and motor-starting demand has been allowed for?
• What happens during a long outage, low battery or interrupted fuel supply?
• What installation work, permits, inspections and ongoing service are included?
• What are the model-specific placement, noise and temperature limits?
• Who provides service locally, and what does the applicable warranty cover?

Have qualified professionals confirm grid isolation and transfer arrangements. Public Safety Canada recommends a qualified electrician for an approved transfer panel when connecting a generator to a home, and carbon-monoxide precautions for fuel-burning equipment. Follow the specific manufacturer instructions and applicable local requirements.