How a Home Standby Generator Works (And Why It’s Different from a Portable One)
When the power goes out unexpectedly, every minute without electricity can be stressful. From spoiled food to freezing temperatures and medical equipment failures, the risks are real. That’s why more homeowners in East Tennessee are investing in home standby generators—but many are still unsure how they work or how they compare to portable generators.
At McCay Southern Generators, we’re here to clear things up.
🔌 What Is a Home Standby Generator?
A home standby generator, also known as a whole-home generator or permanent generator, is a backup power system that’s permanently installed outside your home—similar to an AC unit. It connects directly to your home’s electrical panel and runs on a continuous fuel source such as natural gas or liquid propane.
When a power outage is detected, the system automatically turns on within seconds to restore power—no need to lift a finger.
⚙️ How It Works: Step-by-Step
Outage Detection A transfer switch monitors your utility power 24/7. As soon as an outage occurs, it signals the generator to turn on.
Automatic Activation The generator starts up automatically—typically within 10–30 seconds—delivering power to your home.
Power Distribution Depending on the size of the generator, it can power either essential circuits or your entire home, including HVAC systems, refrigerators, sump pumps, and medical equipment.
Power Restoration Once utility power is restored, the generator shuts off and the transfer switch reverts your home back to the grid.
Self-Testing Most Generac standby generators perform a weekly self-diagnostic test to ensure they’re always ready when needed.
🔄 Home Standby Generator vs. Portable Generator
Feature | Home Standby Generator | Portable Generator |
---|---|---|
Activation | Automatic | Manual |
Installation | Permanent (professionally installed) | Temporary (requires setup) |
Fuel Source | Natural gas or propane | Gasoline |
Coverage | Whole home or essential systems | Limited circuits/devices |
Limited circuits/devices | Quieter (enclosed casing) | Louder |
Convenience | Hands-off, automatic | Hands-on, requires refueling |
Safety | No cords or risk of CO poisoning | Must run outdoors, cord hazards |
🏡 Why More Homeowners Choose Standby Power
Uninterrupted Comfort – Keep your HVAC system, lights, and appliances running smoothly.
Protection for Your Home – Prevent pipes from freezing, basements from flooding, and refrigerators from spoiling.
Peace of Mind – Whether you’re home or away, your standby generator keeps everything running.
Increased Property Value – A standby generator is a long-term investment that adds resale appeal and security.
🔧 Professionally Installed by McCay Southern
As a Generac Power Pro Premier Dealer, McCay Southern Generators handles everything—from site assessment and sizing to installation and maintenance. We provide free consultations, transparent pricing, and lifetime installation guarantees. With service areas throughout East Tennessee, we’re the trusted partner when it comes to home backup power.
💬 Ready to Take Control of Power Outages?
Contact us today to learn more about installing a Generac home standby generator. Don’t wait for the next storm—be prepared, be powered.
📞 (423) 368-2100 🌐 www.mccaysouthern.com 📍 Serving homeowners throughout East Tennessee


