Everything You Need to Know About Generac Generators: How They Work, Sizing, and Lifespan

When the power goes out, life can come to a sudden stop. Whether it’s keeping your lights on, your refrigerator running, or your home office powered, having a Generac generator ensures your comfort and safety are never compromised. At Generator Supercenter of Greater Orange County, we specialize in providing homeowners with reliable, automatic backup power systems designed to fit their unique needs.

If you’re wondering how does a Generac generator work, what size Generac do I need, or even how long can a Generac generator run, this guide breaks it all down for you.

⚡ How Does a Generac Generator Work?

A Generac generator is a fully automatic backup power system that provides electricity to your home during an outage. It’s permanently installed outside your home, much like an air conditioning unit, and connected directly to your home’s electrical system.

Here’s a simple breakdown of how does a Generac generator work:

1. Automatic Power Detection: The system constantly monitors your utility power. When an outage occurs, it automatically detects the loss of electricity.
2. Instant Activation: Within seconds, your generator turns on automatically—no manual startup required.
3. Power Transfer: An automatic transfer switch (ATS) safely disconnects your home from the utility lines and transfers power generation duties to the generator.
4. Continuous Operation: Your generator will continue supplying power to your home until your main utility power is restored.
5. Automatic Shutdown: Once power returns, the generator shuts off and returns to standby mode, ready for the next outage.

Generac’s innovative True Power™ Technology ensures clean, stable energy that’s safe for sensitive electronics and home appliances. It’s power you can rely on, seamlessly delivered.

⚙️ What Do Generac Generators Run On?

Many homeowners ask, what do Generac generators run on — and that’s one of the best parts of owning one. Generac generators typically run on natural gas or liquid propane (LP), both of which are clean-burning and efficient fuels.

• Natural Gas (NG): If your home already has a natural gas line, this is often the most convenient option. You’ll never have to refuel your generator manually, as it draws directly from your home’s gas supply.
• Liquid Propane (LP): For homes without natural gas access, propane tanks are an excellent alternative. They provide the same reliability and efficiency, with long storage life and consistent performance.

These fuel options ensure your backup power supply is always ready, with no need for messy refueling or long waits during storms.

🏡 What Size Generac Do I Need?

Choosing the right size generator is one of the most important decisions you’ll make. A unit that’s too small won’t handle your electrical load, while one that’s too large could be more costly than necessary. So, what size Generac do I need?

That depends on:

1. Home Size – Larger homes naturally require higher wattage.
2. Essential Circuits – Identify which appliances and systems are non-negotiable (HVAC, refrigerator, lighting, sump pump, etc.).
3. Total Load Calculation – Add up the total running wattage and starting wattage of your essentials.
4. Future Growth – If you plan to add an EV charger or expand your home, choose a slightly higher capacity for flexibility.

At Generator Supercenter of Greater Orange County, our experts will perform a load assessment to ensure your system is sized perfectly.

For example:

• Small to medium homes typically need 18kW to 22kW units.
• Larger homes or properties with multiple air conditioners may require 27kW to 48kW units.
• Estates or heavy-load homes might benefit from 60kW+ models for total coverage.

⏱ How Long Can a Generac Generator Run?

A common question we hear is how long can a Generac generator run. The answer depends on your fuel type and capacity.

• On Natural Gas: As long as your gas line supplies fuel, the generator can run indefinitely during an outage. It’s the most convenient setup for long-term reliability.
• On Propane: The runtime is limited by your tank size. For example, a 500-gallon tank can power a generator for roughly 7 to 10 days, depending on load.

Most modern Generac generators are designed for continuous operation—they can safely run for days or even weeks if properly maintained and monitored. This makes them ideal for areas prone to frequent or prolonged outages.

⏳ How Long Does a Generac Generator Last?

Durability is one of the main reasons homeowners trust Generac. So, how long does a Generac generator last?

With proper installation, regular maintenance, and annual servicing, a Generac standby generator can last 20 to 30 years or more. That’s approximately 3,000 to 5,000 operating hours, depending on usage and care.

Routine maintenance includes oil changes, filter replacements, and system checks—services we conveniently provide at Generator Supercenter. Investing in professional maintenance ensures your system performs at peak efficiency for decades.

⭐ Are Generac Generators Good?

Absolutely. Many homeowners and businesses ask, are Generac generators good, and the answer is a resounding yes. Generac has been the leading name in standby power solutions for over six decades and continues to be the #1 brand in home backup generators in the U.S.

Here’s why:

• Automatic & Hands-Free Operation – You don’t have to do anything during an outage; it starts and stops automatically.
• Reliable Engineering – Generac’s G-Force engines are purpose-built for long-term standby use, not modified from automotive designs.
• Smart Technology – Many models include Mobile Link™ monitoring, allowing you to check generator status from your smartphone.
• Quiet Operation – Advanced sound-reducing enclosures make Generac one of the quietest in its class.
• Comprehensive Support – With local installation, maintenance, and warranty service through Generator Supercenter, you’ll never be left without help.

In short, Generac generators are efficient, durable, and built for real-world performance.

💬 Why Homeowners in Orange County Trust Generator Supercenter

At Generator Supercenter of Greater Orange County, we don’t just sell generators—we deliver turnkey power solutions. Our process includes everything from consultation and sizing to installation, permitting, and maintenance. We’re a full-service Generac dealer that ensures your system works flawlessly from day one.

Whether you’re trying to decide what size Generac do I need, wondering how does a Generac generator work, or looking to understand how long can a Generac generator run, our team will guide you every step of the way.

⚡ Final Thoughts

A Generac generator is more than just a backup—it’s peace of mind, safety, and independence. Whether you want to power your entire home or just the essentials, the experts at Generator Supercenter of Greater Orange County are here to help you choose the perfect system.

From explaining what do Generac generators run on to ensuring your system lasts for decades, we’re committed to helping you find the perfect fit for your home and lifestyle.

Contact us today to schedule your free consultation and discover why Generac generators are the smart choice for reliable, automatic home backup power.