Inverter Generator vs Regular Generator: What's the Difference and Which Do You Need?

An inverter generator makes clean, stable power by converting its raw output to DC and then electronically rebuilding it as smooth AC, and it can change engine speed to match the load. A regular generator, also called a conventional or open-frame generator, sends power straight from an alternator spun at a fixed speed. The inverter is quieter at light loads and better for sensitive electronics. The regular generator gives you more watts for your money.

Below is how each one works, a side-by-side comparison using real specs from generators we carry, and a simple way to decide which one you need for home backup, a job site, or camping.

What is an inverter generator?

Every generator uses an engine to spin an alternator. In an inverter generator, the alternator's raw AC output is converted to DC, then an inverter circuit turns it back into AC with a tightly controlled voltage and frequency. Because the electronics set the output frequency, the engine does not have to run at one fixed speed. It can slow down when you are only running a few lights and speed up when the well pump kicks on.

The result is power with low total harmonic distortion (THD), which is what sensitive electronics like computers, TVs, and modern furnace and appliance control boards prefer. DuroMax, for example, rates its iH inverter models at under 3 percent THD.

What is a regular generator?

A regular generator connects the engine directly to the alternator, and the alternator's output goes straight to the outlets. To produce 60 Hz power, the engine has to hold a steady speed, typically about 3,600 RPM, whether you are running one lamp or a whole panel of circuits. That makes it simpler and cheaper to build, and it is why conventional generators deliver more watts per dollar.

Power quality varies by model. DuroMax rates its HX conventional generators at under 5 percent THD, which is clean enough for most household loads, but it is not as tightly regulated as an inverter's output.

Inverter generator vs regular generator: side by side

Here is a real comparison from two DuroMax dual fuel generators we carry. Both make 10,500 running watts on gasoline.

Same running output, cleaner power, quieter at light load, and a little more runtime per tank for the inverter, at nearly twice the price. That trade is the whole decision in one table. Note that manufacturers measure noise at different loads, so treat dB figures as a guide rather than an exact head-to-head.

One myth to drop: inverter generators are often described as small and light. That is true of compact camping units, but home backup inverters are not. The XP13500iH weighs about the same as the XP13000HX, and the 16,000 watt XP16000iH weighs 368 lb dry. Both types at this size roll on wheels rather than being carried.

Pros and cons

Inverter generator

• Pros: cleaner power for electronics, quieter at light and medium loads, better fuel economy when lightly loaded, and variable engine speed that reduces wear at low load.
• Cons: higher price per watt, more complex electronics, and the biggest models are just as heavy as regular generators.

Regular generator

• Pros: the most watts per dollar, simple and proven design, and wide choice of large sizes for whole-home backup.
• Cons: louder, engine runs at full speed even at light load, burns more fuel when lightly loaded, and power is less tightly regulated.

Which one do you need?

• Home backup on a budget: a regular dual or tri fuel generator gives you the most output for the money, connected through a transfer switch or generator interlock kit.
• Home backup with lots of electronics, or neighbors close by: an inverter. Cleaner power for computers, TVs, and appliance control boards, and lower noise through a long outage, especially overnight when loads are light.
• Job sites and heavy tools: a regular generator is usually the better value, since tools care more about raw watts than about THD.
• Camping and RVs: an inverter, for quiet campgrounds and clean power for electronics.
• The middle ground: an open-frame inverter, like the DuroStar DS8000iX or DS14000iX, uses inverter electronics in an open frame without the full sound-dampening enclosure, at a price much closer to a regular generator.

Not sure how many watts you need? Start with our guide on what size generator to run a house.

Inverter generators we carry

Every generator below is carried by Krato Power and in stock as of this writing. Running watts are on gasoline.

• DuroMax XP9500iH: 9,500 starting / 7,600 running watts, dual fuel, 61 dB at 25% load. $1,999.
• DuroMax XP11000iH: 11,000 / 9,000 watts, dual fuel, 61 dB at 25% load. $2,499.
• DuroMax XP13500iH: 13,500 / 10,500 watts, dual fuel. $2,699. Tri fuel version: XP13500iHT, $2,999.
• DuroMax XP16000iH: 16,000 / 13,000 watts, dual fuel, variable engine speed. $4,999. Tri fuel version: XP16000iHT, $5,299.
• DuroMax XP28000iHT: 28,000 / 22,000 watts, tri fuel, for large homes. $7,999.
• Open-frame inverters: DuroStar DS8000iX, 8,000 / 6,500 watts, $999; and DuroStar DS14000iX, 14,000 / 11,000 watts, $1,999.

See them all in our inverter generators collection.

Regular generators we carry

• DuroMax XP5500HX: 5,500 / 4,500 watts, dual fuel, for essentials and job sites. $629.
• DuroStar DS13000MXT: 13,000 / 10,500 watts, tri fuel. $999.
• DuroMax XP13000HX: 13,000 / 10,500 watts, dual fuel. $1,399. Tri fuel version: XP13000HXT, $1,499.
• DuroMax XP15500HX: 15,500 / 12,000 watts, dual fuel. $2,299.
• DuroMax XP17500HX: 17,500 / 13,750 watts, dual fuel. $2,699. Tri fuel version: XP17500HXT, $2,999.
• DuroMax XP15000HXT+: 15,000 / 12,000 watts, tri fuel with electronic fuel injection for easier cold starts. $3,499.

Browse every model in our portable generators collection, or compare fuel options in dual fuel vs tri fuel generators. Some models are not sold in California, so check the product page if you are there.

Frequently asked questions

Are inverter generators better? They are better for power quality, noise, and fuel use at light loads. Regular generators are better for raw watts per dollar. Neither is better for every job.

Can an inverter generator power a house? Yes, if it is big enough. Large inverter models like the DuroMax XP16000iH and XP28000iHT put out 120/240V and connect to your home through a transfer switch or interlock kit, the same as a regular generator. See our interlock kit vs transfer switch guide.

Do I need an inverter generator for my furnace or refrigerator? Not necessarily. Many modern furnaces and appliances have electronic control boards that work best on clean power, which is a point in the inverter's favor. If you are using a regular generator, a model with low rated THD and stable voltage is the safer choice. Check your appliance manual for any generator guidance.

Are inverter generators quieter? Usually, especially at light loads, because the engine slows down when demand is low. At full load the gap narrows, since both engines are working hard.

What is the 80% rule for generators? It is a common rule of thumb to keep your continuous load at or below about 80 percent of a generator's rated running watts. That leaves headroom for motor startup surges and reduces strain on the engine. For a 10,500 running watt generator, that is about 8,400 watts of steady load.

Can I run a generator overnight? Yes, with the right setup outdoors and away from the house. See can you run a generator overnight for the safety checklist.

Not sure which way to go? Call our team at 888-855-7286 with the appliances you need to run, and we will help you size and choose between an inverter and a regular generator.

Never run a generator indoors, in a garage, or near windows and doors. Carbon monoxide is deadly. Specs are manufacturer ratings; actual output, runtime, and noise vary with load, fuel, altitude, and conditions. Connect a generator to your home only through a transfer switch or listed interlock kit installed by a licensed electrician.

Reviewed by the Krato Power team. Questions? Reach us at 888-855-7286.