Quelle puissance de génératrice choisir pour une maison

What size generator should I choose for a house?

How to choose the right generator power for a home

Choosing the right generator power is the most common mistake made by individuals. Too small, it stalls or gets damaged. Too large, it costs more to buy and operate with no real benefit.

This guide helps you choose the right generator power for a home, according to your actual needs, appliances, and how you use it.

Why power is so important

A generator must be able to start AND run your essential appliances at the same time. Incorrectly estimated power can lead to:

  • tripping circuit breakers

  • the generator straining unnecessarily

  • premature wear

  • failures during an emergency

Essential appliances to consider

Start by listing what you absolutely want to power:

  • Refrigerator / freezer

  • Furnace (blower)

  • Water pump or sump pump

  • Basic lighting

  • Internet router

  • Television or computer

Each appliance consumes continuous watts and, for some, much more power at startup.

Recommended power based on house type

Basic home (essentials only)

  • Refrigerator

  • Lighting

  • Telecommunications

👉 2000 to 3500 watts

Average home

  • Refrigerator

  • Freezer

  • Furnace

  • Water pump

👉 3500 to 6500 watts

Full house or residential construction site

  • Several large appliances

  • Tools

  • Heating

👉 7500 watts and up

Don't forget starting watts

Some appliances require 2 to 3 times more power at startup for a few seconds.
This is why you should always plan for a safety margin.

To fully understand this difference, read this article:
👉 [Starting Watts vs. Running Watts: Understanding the Difference](LINK TO ADD)

Concrete example

A generator advertised at:

  • 3500 running watts

  • 4500 starting watts

Can power several appliances, but only if the sum of the running watts remains under 3500.

Common mistake to avoid

Plugging in too many motor-driven appliances at once can cause:

  • a voltage drop

  • the generator to shut down

  • long-term damage

Recommended generator models based on your needs

Conclusion

The right generator power depends on your actual needs, not marketing.
When in doubt, it's better to choose slightly more powerful than just enough.

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