Best Dual Fuel Generator with Low THD

If you’re looking for a dual fuel generator to power sensitive electronics, you’ll want to consider a dual fuel generator with low THD.

What is THD? 

Total harmonic distortion (THD) is the amount that a voltage waveform or current is distorted. High THD reduces the efficiency of a portable generator. Low THD is requires for sensitive electronics, look for inverter generators to run these as they have lower THD levels.

Generator THD usually ranges from 1-2% up to 25%. Generators are considered to produce clean power under 6% THD.

Best Dual Fuel Generators with Clean Power

Dual fuel generators are multi fuel machines that use gasoline or propane as fuel to provide electricity for appliances and electronic devices.

We believe the best dual fuel generators with low THD (under 5%) to be the following models:

Champion 2000 Watt Inverter Generator

Westinghouse iGen4500DF

DuroMax XP2300iH

Champion 2000 Watt Inverter Generator

The Champion 2000 Watt Generator  stands out in that it’s the most affordable option on this list.

No lack of compromise with performance because this generator gets up to 11.5 hours of run time on gasoline at 25% load (Up to 34 hours on propane).

It’s also the lightest generator in its class at under 40 lbs. This, along with its convenient top handle makes the Champion 2000 easily portable.


  • 79 cc 4 Stoke OHV Engine
  • Includes two covered 120V 20A household outlets with clean electricity (less than 3% THD)
  • Starting Watts: 2,000/Running Watts: 1,700
  • Noise level: 53 dB
  • Demensions (in): 17.3 x 11.5 x 17.7
  • Weight: 39.5 lbs
  • Includes USB Adapter, battery charging cables, engine oil, and oil funnel.
  • CARB Compliant
  • EPA Certified


  • Lightweight and easily portable
  • Long run time
  • Affordable
  • Quiet


  • Not as quiet as others

Westinghouse iGen4500DF Inverter Generator

The Westinghouse iGen4500  Dual fuel Inverter Generator is an advanced, hybrid generator. With inverter technology, its able to provide clean, stable power for sensitive electronic devices.
This generator can run off gasoline or propane and has an inverter that provides power to your home in a stable, consistent manner.
It can provide up to 4500 watts of power and has four 120-volt outlets that are compatible with most household appliances.   For power outages at home, camp or during an emergency situation. This inverter generator can provide up to 4500 watts of AC power for 12 hours without refueling.
The iGen4500 inverter generator is designed for low noise and low emissions to maintain a more comfortable environment with the added benefit of remote start capability from up to 260 feet away.


  • Strong 4500 Peak Watts, 3700 running Watts.
  • THD-Less than 3%
  • Up to 18 hours run time at 25% load
  • If you’re within 260 feet of the generator, you can easily control the stop and start button with the remote key fob.
  • Very quiet at 52 dB
  • 104 lbs
  • 5 power outlets
  • Three years warranty from the manufacturer


  • High run time (Up to 18 hours)
  • Powerful remote start key fob, capable of function up to 260 feet away
  • Quiet


  • Expensive
  • Heavy


DuroMax XP2300iH

The DuroMax XP2300iH  is another option to consider.  It performs a solid 6.5 hour run time at 50% load. Its very quiet at only 52 dB compared to most other generators.

Although still easily portable with its top grip handle, it’s a bit heavier than others. Dual fuel options with the DuroMax XP2300iH for either gasoline or propane. However, this is one of the more expensive generators in its class.


  • 80 cc 4 Cycle Air Cooled Engine
  • Engine speed: 3600-5300 RPM
  • Starting Watts: 2,300/Running Watts: 1,800
  • Noise level: 52 dB
  • Demensions (in): 22x14x20
  • Weight: 60 lbs
  • CARB Compliant
  • EPA Certified


  • Inverter technology provides clean energy preventing power surges. Making it ideal for sensitive electronics like computers, tablets and phones
  • Quiet


  • Heavy
  • Run time not as long as others



Inverter Generators

Inverter generators convert AC (alternating current) power into DC (Direct current) power and ultimately converts it back  to AC power which results in clean, surge free electricity for appliances and electronics.

Because of this, Inverter generators typically have lower THD than conventional generators. When generator shopping for low THD models, look for inverter generators.

Also Read: 16 Things You Should Know about Dual Fuel Generators

Frequently Asked Questions (FAQs)

Can Dual Fuel Generator Run on Natural Gas?

No, dual fuel generators do not typically run on natural gas. Dual fuel generators usually run gasoline or propane. Tri-fuel generators can run on gasoline, propane, or natural gas.


Can You Convert a Dual Fuel Generator to Natural Gas?

Yes, there are tri fuel conversion kits you can use to convert a dual fuel generator into a tri fuel generator.


What Dual Fuel Generators are Made in the USA?

Here are a few dual fuel generators made in the USA.

  • Westinghouse WGEN7500DF Generator
  • DuroMax XP10000EH Portable Generator
  • Pulsar 12000 Dual Fuel Generator

What is the Quietest Dual Fuel Generator?

The DuroMax XP2300iH and Westinghouse iGen4500 are both very quiet at 52 dB.

So, Which is Best?

There is no one size fits all answer.. as each model has its own specializations in addition to your own preferences, usage needs and budget.

Below is the best option for each category

Cleanest PowerTie (Westinghouse iGen4500 and Champion 2000 both less than 3% THD)

Performance- Champion 2000

Price- Champion 2000

Portability- Champion 2000

Safety- DruoMax XP2300iH

Noise – Tie (DuroMAX 2300 and Westinghouse iGen4500 both at 52 dB)


Each of the above models are dual fuel generators with low THD and can be used to safely power sensitive electronic devices.

We believe the best overall dual fuel generator with clean power to be the Champion 2000 Watt Dual fuel Inverter generator due to its affordable price, portability, long run time and low THD level.

The Westinghosue iGen4500 is the most powerful option with up to 4500 peak Watts.

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