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How Does a Home Generator Work?

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Power outages seem more frequent than ever before. Between major storms knocking down power lines and aging infrastructure leading to grid failures, most of us have experienced the frustration of losing power right when we need it most. But there is a solution - installing a home generator.

Home generators are becoming necessary for reliable backup power during outages. They provide peace of mind knowing that you'll have electricity to keep your home livable if the grid goes down. With wild weather and unreliable power grids, home generators are a smart investment for any homeowner.

Home Generator Work

This article will explore how home generators work and key considerations before buying one for your home. Whether you experience frequent short outages or live in an area prone to major grid failures, having a backup generator helps ensure your household keeps running. Let's take a closer look at how these systems operate and what to think about when choosing the right home generator.

How Do Home Generators Work?

When the lights go out, a home generator kicks in to keep the power flowing. It's like having a mini power plant right in your own backyard!

The magic starts when the generator detects that the utility power has gone off. This can happen automatically or you can start it manually with the flip of a switch.

Once activated, the generator's engine starts up and begins driving an alternator, similar to a car engine. The alternator starts spinning rapidly to produce alternating current (AC) electricity.

This AC power is then distributed through your home's electrical system just like the electricity that normally comes from the utility lines. It flows through your electrical panels and outlets to power lights, appliances, and other devices.

The fuel that runs the engine and allows the alternator to generate electricity can vary. Common options are natural gas, diesel, propane, or gas. Some generators even convert sunlight into electricity using solar panels.

So in a nutshell, home generators work by converting fuel into rotational energy to drive an alternator and produce the AC electricity we rely on in our homes. Pretty cool! When the grid fails, generators automatically kick in to keep your most important systems running.

Why Do You Need a Home Generator?

It seems like power outages always happen at the worst possible moment. You're cooking dinner and the power goes out, leaving you unable to finish cooking. Or you're working from home and suddenly your internet cuts out right before an important video call. These disruptions can quickly throw your day into chaos.

A home generator gives you the power to prevent outages from ruining your plans. With a generator, you can keep your appliances, devices, and home office running even if the grid goes down. The generator automatically detects a power loss and seamlessly switches on to restore electricity within seconds. This continuity of power keeps your household operating smoothly despite outside conditions.

Home Generator power home devices

Home generators are especially critical for households in regions prone to disasters like hurricanes, tornadoes, or winter storms. When weather threatens the electrical infrastructure, you can feel confident knowing your generator will keep essentials like lights, refrigeration, and medical devices online. Growatt's portable power station line provides a sustainable solar solution so you can maintain power indefinitely, without relying on finite fuel supplies.

Rather than remaining helpless in the face of inevitable outages, take control with a home generator. Don't allow your family's comfort and productivity to be at the mercy of an unreliable grid. Invest in the peace of mind of a backup power source you can depend on.

Benefits of Home Generators

When the power goes out, life at home can come to a standstill. Suddenly you're left without light, heat, internet, refrigeration, and more. It's incredibly disruptive, uncomfortable, and downright dangerous during extreme weather. A home generator changes all that by providing continuous power flow so your household stays up and running.

The key benefits of having a home generator include:

  • Provide continuous power during outages - Rather than going dark when the utility power fails, your home seamlessly transitions over to backup generator power. With the flip of a switch, your lights stay on, appliances keep humming, and your family stays comfortable.

  • Allow household to stay comfortable - When a blackout hits during a cold winter storm or scorching summer heat wave, a home generator lets you continue running the heating, A/C, fans, and anything else needed to maintain safe temperatures indoors. This prevents the health risks and sheer misery of weathering extreme conditions without climate control.

  • Growatt models offer whole-home backup - Growatt power stations provides a complete home power solution. Their high-capacity batteries coupled with smart Growatt software allow Growatt power stations to deliver backup electricity for an entire household for extended durations. 

  • Integrate solar for eco-friendly usage - In addition to utility and generator power, Growatt's power station systems seamlessly integrate solar energy. By pairing your generator with rooftop solar panels and the Growatt Home Panel, you benefit from a clean energy source while reducing overall fuel consumption and emissions. This allows for more sustainable, eco-friendly usage compared to traditional generators.

Having uninterrupted access to electricity during grid failures provides tremendous peace of mind. You can ride out power outages in comfort and safety, avoiding spoiled food, disrupted work, and dangerous indoor temperatures. With whole-home backup capability, advanced software, and solar integration, Growatt's solar generators deliver the ultimate in resilient, eco-friendly home power.

What is a Transfer Switch and Why You Need One?

A transfer switch is a critical component of any home generator system. This device facilitates the safe transition of electrical load between your utility power and your backup generator power. Having a proper transfer switch setup prevents dangerous backfeed of electricity into utility lines, which could electrocute workers trying to restore grid power.

Most areas legally require transfer switches to meet electrical codes for home generators. Without one, you risk serious fines. Transfer switches allow your home to automatically switch over to generator power when an outage occurs. This means you don't have to manually connect extension cords or reset breakers.

transfer switch - Growatt

Strategically installed transfer switches also enable you to be selective about which circuits receive backup power. This allows you to allocate generator wattage only to the most essential appliances and devices during an extended outage. Proper transfer switch installation ensures seamless, uninterrupted functionality for items like your refrigerator, heating system, home office, and medical devices.

Investing in a quality transfer switch appropriate for your generator's wattage allows safe, automatic backup power with legal compliance and strategic load management. Don't cut corners here - a good transfer switch is crucial to realizing the full benefits of your home generator.

What to Consider Before Buying a Home Generator?

Deciding on the right generator for your home is an important process that requires careful consideration. The first step is to take a close look at your household's power requirements. Make a list of essential appliances and devices you want to run during an outage. Add up their wattages to determine the minimum generator capacity needed. Remember to account for starting watt surges which can be 2-3 times an appliance's rated wattage.

The next key factor is fuel type. Compare the pros and cons of natural gas, diesel, propane, and solar generators. Consider fuel availability in your area, storage requirements, and generator noise levels. Natural gas generators are convenient but require professional installation of gas lines. Diesel offers long run times but requires fuel storage and transport. Propane is portable yet you'll need ample tanks. Solar harnesses renewable energy but has battery dependence.

Also factor in the costs of professional generator installation and ongoing maintenance expenses. These can really add up over time. Be sure to check your local regulations on noise limits, permitting requirements, and emissions standards. Some areas have strict rules.

Finally, choose a reputable, durable generator brand known for reliability. Read reviews and make sure the warranty, rated lifespan, and customer service meet your needs. Opting for a quality model means your generator will perform when you need it most. Making informed decisions now will ensure your generator provides critical backup power for years to come.

Choosing the Right Size

Choosing the right size generator for your home's needs is critical. The most important factor is calculating your home's total starting wattage requirements. This involves adding up the startup power demands of essential appliances and devices you want to run during an outage. For example, a refrigerator may need 700-1400 watts for startup, while a furnace fan needs around 1000 watts.

It's important not to just add up the running watts of appliances, since starting wattages are often double or more. You should also consider potential future needs, like a new AC unit or electric vehicle charger. Having some extra capacity in your generator allows you to power additional devices if needed.

Growatt offers a range of generator sizes to meet different power requirements. The Growatt INFINITY 2000 is with a 2048WH capacity, it can provide 2200W of continuous power and 4400W peak power. Choosing the right size upfront ensures your generator won't be overloaded but also won't be overkill for your needs. Investing in a properly sized generator from a reputable brand like Growatt will provide reliable backup power when you need it most.

Growatt INFINITY 2000 home generator

Fuel Type Comparison

When shopping for a home generator, one of the most important considerations is which fuel type to choose. There are several common options, each with their own pros and cons.


Gasoline generators are very common and inexpensive to purchase. The fuel is easy to obtain and portable. However, gasoline has a relatively short run time, requiring frequent refueling. These generators must be manually started and shut off.


Propane provides a long run time, often double that of gasoline. Large external tanks can supply propane for days. But you'll need space for the bulk tank. Propane generators start and stop automatically.


Diesel generators are known for their high fuel efficiency and long run times. But they require more maintenance like oil changes. Diesel fuel has a long shelf life. Diesel engines also last many years.

Natural Gas

For a home, natural gas delivers an abundant fuel source. Hookups allow unlimited run time. But generators must be fixed in place with professional installation. Reliability depends on natural gas infrastructure.


Solar generators convert sun to electricity for a clean, renewable fuel source. Battery banks provide power day and night. But solar depends on sunny weather and sized battery capacity. Solar generators complement conventional fuel types.

Key Generator Features

When selecting a home generator, there are several key features to look for that can enhance performance, convenience and ease of use:

Electric Start

Having an electric start function allows the generator to be switched on with the simple press of a button, without needing to manually pull-start the engine. This makes the generator much easier to operate, especially for those who lack the physical strength or stamina for manual starts. Just press and go for instant power.

Fuel Gauge

An integrated fuel gauge lets you monitor the fuel level at a glance, eliminating guesswork. This allows you to conveniently track when it's time to refill the tank. Running out of fuel during an outage can leave you powerless, so a fuel gauge is essential.

Remote Monitoring

Remote monitoring capabilities enable you to check the generator's status and operating conditions from your smartphone or computer. This allows you to ensure proper functioning and receive alerts if issues arise, even while away from home.

Quiet Operation

Look for generators marketed as "quiet" or "super quiet". Noise level is a key consideration, especially if the unit is located near living spaces. Quiet operation maintains comfort during prolonged outages when you may rely on the generator for days.

WiFi Connectivity

WiFi connectivity enables smart control and monitoring. You can adjust settings, track performance, receive status updates, and start or stop the generator using a mobile app. This allows you to control your generator remotely for added convenience.

Installation and Maintenance

Professional installation is highly recommended for home generators to ensure proper setup and compliance with local codes. Though do-it-yourself installation is possible for smaller, portable generators, larger standby generators are complex systems that are best left to the experts. Licensed electricians and technicians have the tools, expertise, and experience to size, place, and hook up your generator safely and efficiently. This provides peace of mind that your generator will function as intended when you need it most.

Routine maintenance is essential to keep your home generator running smoothly for years to come. Follow the manufacturer's guidelines for maintenance tasks and timelines. This typically involves changing the oil and oil filter, replacing air filters, inspecting battery and connections, and testing generator functionality. Well-maintained generators have a significantly longer lifespan.

It's critical to regularly test your generator by running it under load. Once a month is ideal, with biweekly tests for whole-home standby systems. This ensures it starts up properly and is providing clean, stable power. Testing also keeps engine parts lubricated and prevents fuel varnishing. Make generator testing part of your emergency preparedness routine.

Always keep your generator's fuel tank full and the fuel stabilized for long-term storage when not in use. Rotating fuel with fuel stabilizer prevents oxidation and moisture buildup. Topping off the tank helps prevent condensation and lets you safely operate the generator for extended run times.

Properly storing your generator is also key for longevity. Keep it covered in a clean, dry space protected from weather and pests when not in use. Let the engine cool before storing and disconnect the battery. Following prudent installation, maintenance, and storage best practices gives you a reliable backup power system when you need it most.

Generator Safety Tips

Operating a generator safely is critical, as improper use can lead to carbon monoxide poisoning, electric shock, and fire hazards. Here are some key safety tips when using your home generator:

  • Keep the generator at least 20 feet away from doors, windows, and vents. Exhaust contains poisonous carbon monoxide that can accumulate indoors.

  • Never run a generator inside your home or garage, even if the doors are open. Always operate it outdoors in a well-ventilated area.

  • Plug appliances directly into the generator using heavy-duty extension cords. Do not connect the generator to your home's electrical panel without a transfer switch.

  • Have a qualified electrician install a transfer switch to safely connect the generator to your home wiring. Attempting to wire it yourself could electrocute utility workers.

  • Keep children and pets away from the generator when it is running. The equipment gets extremely hot and has rapidly moving parts.

  • Avoid getting the generator wet or operating it with wet hands. The risk of electrocution is severe. Keep it on a dry surface under an open, canopy-like structure.

  • Refuel the generator only when it is stopped and has had time to cool down. Spilled gas on hot components could ignite.

Following basic safety precautions will help ensure safe, reliable power from your home backup generator during outages.

Top Home Generator Brand

When investing in a home generator, it's important to choose a reliable brand with a proven track record. Here is your top options to consider:


For a modern, eco-friendly alternative, Growatt offers innovative portable solar generators. Their power station line combines lithium batteries and solar charging to provide sustainable backup power. Smart features like app control and modular add-on batteries set Growatt apart.

Cost of Home Generators

The cost of a home generator can vary greatly depending on the type, size, and features. Here's a breakdown of typical generator costs:

Portable Models

Portable generators are the most affordable option, ranging from about $500 for a small 3,000-watt model up to $2,000 or more for a high-capacity 7,500+ watt unit. These can provide backup power for limited essentials.

Standby Generators

For whole-home backup power, standby generators start around $2,000 for a basic 7,000-watt unit. Higher-end standby models up to 20kW or more cost $5,000 to $10,000+. Professional installation is required, adding $500 to $1,500+.

Installation Costs

You'll need to factor in installation costs if you opt for a permanently installed standby generator. This involves electrical work to integrate the generator with your home's electrical panel and systems. Expect to pay $500 to $1,500 or more for professional generator installation.

Maintenance Costs

All generators require periodic maintenance like oil and filter changes, which usually adds up to around $100 to $300 per year. Standby generators need annual inspections to ensure safe operation.

Fuel Costs

Fuel costs depend on your generator's run time and fuel type. Gasoline generators average about $0.75 per hour of operation based on today's gas prices. Propane costs around $1.50-$2 per hour. Natural gas is most affordable at $0.45-$0.75 per hour.


When the lights go out, home generators provide a critical lifeline to keep your household running. Rather than sitting in the dark, generators allow key appliances like refrigerators, freezers, and medical devices to continue operating. They ensure your home remains safe, comfortable, and functional until utility power returns.

In recent years, advances in solar energy and battery storage have enabled sustainable, eco-friendly home generators. Growatt solar generators can harness energy from the sun for clean, renewable backup electricity. Their integrated batteries offer weeks of stored power, recharged by solar panels or the grid.

Choosing the right home generator is a big decision. Take time to carefully evaluate your family's needs in terms of power requirements, fuel availability, noise levels, and costs. Consult with a reputable dealer who can assess your home and recommend the ideal generator model. With the right preparation and product selection, a home generator can provide lasting peace of mind that your essential needs will be met, even in the darkest storms.

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