Portable vs. Standby Generator: What Ontario Homeowners Should Know

After a summer storm knocks out power for a few hours, most homeowners land in one of two camps: buy a portable generator and figure out how to hook it up safely, or install an automatic standby system and stop thinking about outages altogether. Both are legitimate choices. Here's how backup power installation actually breaks down.

Portable Generator + Interlock Kit

A portable generator paired with a properly installed interlock kit (or manual transfer switch) is the lower-cost route into backup power. You keep the generator in the garage or shed, and when the power goes out, you roll it outside, plug it in, and flip the interlock to route power to selected circuits, typically your fridge, furnace, sump pump, and a few lights. The tradeoff is that someone has to be home to set it up, and it only runs what you manually plug in.

Automatic Standby Generator

A standby generator lives permanently outside your home, wired to natural gas or propane, and switches on within seconds of an outage through an automatic transfer switch, with no one needing to be there. It can be sized to run your whole home or just a set of critical circuits. It costs significantly more than a portable setup, both for the unit and the fuel line work, but it's the only option that protects you if the power goes out while you're away.

The Part That Isn't Optional: The Transfer Switch

Whichever route you choose, a generator can never be connected to your panel without a transfer switch or interlock kit. Plugging a generator into an outlet or panel without one risks backfeeding power into utility lines that hydro crews assume are dead during an outage, which is both a serious safety hazard and against code. This is the single most common mistake we see with DIY generator setups.

Sizing Is the Real Decision

The bigger question isn't portable versus standby, it's what you actually want to keep running. A generator sized only for a fridge and a few lights won't run a furnace blower or a sump pump under real load, while a whole-home unit costs more than most households need. We calculate the load for your must-have circuits first, then size the generator and switch to match, rather than defaulting to whichever unit is biggest.

Get It Wired Safely, Whichever Way You Go

We install both automatic standby systems and interlock kits for portable generators, permitted and ESA-inspected, across Toronto and the GTA. Contact us or call us directly to talk through what backup power actually makes sense for your home.