620 vs 820 Water Pump Inverter: Which One Should You Choose?

AUSENIST 620 and 820 series are intelligent variable frequency drives designed for water pump applications.

Both series support constant-pressure water supply, multi-pump control, IP54 protection, permanent magnet synchronous motors and induction motors.

However, they are designed for slightly different requirements.

The main differences are power range and RS485 communication configuration.

620 Series Power Range

The AUSENIST 620 series covers:

0.75kW to 7.5kW

It is mainly designed for intelligent pump systems where communication, multi-pump control and system redundancy are important.

One of its key advantages is that dual RS485 interfaces are available throughout the complete power range, including low-power models.

This makes the 620 series suitable for systems where multiple inverters need to communicate with each other.

820 Series Power Range

The AUSENIST 820 series covers:

0.75kW to 22kW

Its wider power range makes it suitable for customers who need larger pump capacities.

For 220V models at 0.75kW and 2.2kW, the 820 series uses a single RS485 interface.

For the 380V range, the 820 series uses dual RS485 communication similar to the 620 series.

What Functions Do 620 and 820 Share?

Both inverter platforms support important pump-specific functions.

They use an IP54 protected design and can be mounted directly on compatible motor junction boxes using a backpack-style installation.

Both series also support:

• Permanent magnet synchronous motors
• Asynchronous induction motors
• Multi-pump control
• Automatic restart
• Water-shortage protection
• Pipe-burst automatic shutdown
• Anti-freeze protection
• Anti-rust protection

This means both products are designed as intelligent pump controllers rather than only standard motor-frequency converters.

Which One Is Better for Multi-Pump Systems?

If communication capability is a major requirement, the 620 series has an advantage in the low-power range because it uses dual RS485 throughout the series.

The 620 platform can support a dual-master architecture with up to four auxiliary pumps.

If the active master fails because of a communication, sensor or hardware problem, the backup master can automatically take over system control.

The system can also skip a failed auxiliary pump and start the next available pump.

Timed pump rotation helps distribute operating hours across multiple pumps.

Which One Is Better for Higher Power?

If your pump application requires power above 7.5kW, the 820 series provides the wider range, extending up to 22kW.

This can make it more suitable for larger booster pumps, industrial water supply and other higher-power pump applications.

Which One Is More Cost-Effective?

According to the product positioning in our internal sales material, the 820 series is the more economical choice when customers do not require dual RS485 on low-power 220V models.

The 620 series is recommended when stronger communication capability and multi-pump connectivity are more important.

620 Series Is Recommended When

Choose 620 when your project needs strong multi-pump communication, dual RS485 across the complete range, system redundancy or intelligent constant-pressure water supply.

820 Series Is Recommended When

Choose 820 when you need a wider power range up to 22kW or want a more cost-effective pump inverter solution where a single RS485 interface is sufficient on lower-power 220V models.

Frequently Asked Questions

What is the power range of the 620 series?

The 620 series covers 0.75kW to 7.5kW.

What is the power range of the 820 series?

The 820 series covers 0.75kW to 22kW.

Does the 620 series have dual RS485?

Yes. Dual RS485 is available throughout the 620 power range.

Does the 820 series have dual RS485?

The 220V 0.75kW and 2.2kW versions use single RS485. The 380V range uses dual RS485.

Do both series support PMSM motors?

Yes. Both platforms support PMSM and asynchronous induction motors.

Are both series IP54?

Yes. Both platforms use an IP54 protected pump-oriented design.

Need Help Choosing 620 or 820?

Send AUSENIST your pump power, motor voltage, motor type, application and required communication configuration.

Our team can recommend the appropriate water pump inverter for your project.

Website: www.ausenist.com