Total Harmonic Distortion (THD) and DuroMax Generators

DuroMax portable generators produce industry-standard Total Harmonic Distortion (THD) levels suitable for most household devices and appliances.

Under normal operating conditions, DuroMax portable generators typically produce:

• About 5% THD or less under standard loads

• Up to approximately 20% THD during heavy or surge loads

What Type of Power Wave Does the Generator Produce?

DuroMax generators produce a true sine wave, not a modified sine wave or square wave.

This means they are capable of powering most common household electronics, including:

• Laptop computers

• Cell phones and chargers

• Televisions

• Small kitchen appliances

• Power tools

• Most household electronics

What Is Total Harmonic Distortion (THD)?

Total Harmonic Distortion (THD) is a measurement that shows how much an electrical waveform deviates from a perfectly smooth sine wave.

All electrical power sources contain some level of THD, including electricity supplied by utility companies.

A lower THD percentage generally indicates cleaner and more stable power.

Devices That May Require Lower THD

Some sensitive electronics may require very low THD levels (typically below 5%) to operate properly.

Examples include:

• UPS (battery backup systems)

• Pellet stoves

• High-efficiency furnace control boards

• Certain medical equipment

• Some advanced electronic devices

For these types of applications, we recommend using a DuroMax inverter generator, which is designed to produce cleaner power with THD levels below 5%.

How to Verify THD Requirements for Your Device

If you are unsure whether your appliance requires low THD power, we recommend contacting the manufacturer of the appliance to confirm its electrical requirements.

They can provide guidance on whether the device requires low THD power (less than 5%).

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✅ Support Tip:
Most household appliances and electronics operate normally with standard generator THD levels, but highly sensitive equipment such as UPS systems and furnace control boards may require inverter generators with lower THD output.