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The right generator size depends on the equipment you want to run and how it will operate during an outage. Floor area and electrical service rating do not provide the complete answer. A load assessment and a clear backup-power plan should come before selecting a generator.
For homes in Toronto and the GTA, or properties in Simcoe County and Muskoka, start with your priorities: what must remain powered, what can wait and what may be managed automatically.
List the essential loads
Write down the equipment you rely on during an outage. That may include heating controls, refrigeration, selected lights, internet equipment, a sump pump or a well pump. Then add comfort items you would like to retain.
Identify the actual models and electrical specifications where possible. A category such as “heating” is not enough to describe the power needs of every home. Include equipment you plan to install in the near future.
Mark which items must work automatically and which you are comfortable leaving off. This brief gives the designer a practical objective.
Starting demand matters as well as running demand
Generac’s sizing guidance distinguishes the power needed to run equipment from the higher starting demand of certain appliances and motors. A generator should be assessed against the intended combination of loads and their operating behaviour.
A simple sum of labels or a square-footage calculator is only a starting point. Ask the installer to explain the load analysis and the assumptions about what can run together.
Define what “whole-home backup” means
Ask whether the proposal supplies selected circuits or connects through an arrangement serving the broader home. Then ask which loads can operate simultaneously. A system connected to the whole home may still rely on management of large loads.
The important result is an agreed operating plan. If cooking, air conditioning, electric heating or EV charging is a priority, name it explicitly rather than assuming it is included in a general description.
| Planning choice | Question to answer |
|---|---|
| Essential circuits | Which equipment must remain available? |
| Larger loads | Which may start or run at the same time? |
| Load management | What may be delayed or disconnected automatically? |
| Future additions | What equipment is already planned? |
| Property operation | Who checks the system and responds to alerts? |
Review load management before choosing more capacity
Load management can be part of a generator design. It allows specified loads to be controlled so the system operates within its capabilities. Generac recommends a professional analysis rather than simply sizing for every appliance at full output simultaneously.
Have the proposal identify the equipment being managed and the expected priority order. Ask what happens when several requested loads compete for capacity. The explanation should be understandable without needing to interpret a wiring diagram.
A cottage needs an operating plan too
Explain whether the property is occupied year-round or left unattended for periods. Identify the equipment that matters while you are away, how alerts will reach you and who can attend if needed.
Do not assume a larger generator removes the need for maintenance or monitoring. Discuss service access and the responsibilities for checking the installed system. If the property has a well, pumps or unusual equipment, supply those details early.
Confirm fuel, location and installation scope
Generator selection needs to fit the property as well as the loads. The site review should address the proposed location, installation instructions, fuel arrangements and coordination with the appropriate trades.
Ask who handles gas work, electrical transfer equipment, any utility coordination, excavation and restoration. Identify applicable approvals and inspections in the scope. Equipment capacity alone does not describe the installed project.
Compare proposals by the result they provide
Request a named generator and transfer arrangement, a list of backed-up loads, any management equipment and the exclusions. Ask what testing, demonstration and maintenance arrangements are included.
Before the consultation, send closed-panel photos, an equipment list and your outage priorities. Electric FX can review the property and develop a proposal for the agreed backup-power functions.
Explore Electric FX backup generator services or request a home or cottage assessment.
Further reading: Generac generator sizing guidance; ESA generator safety guidance.