With the growing demand for flexible EV charging solutions, portable on-board chargers (Mode 2) have become an essential product for fleet operators, distributors, and infrastructure partners.
Among all configurations, 3.5kW and 7kW are the two most common power options — but they are designed for very different usage scenarios.

This article explains how to choose between 3.5kW and 7kW, from an electrical, operational, and deployment perspective.

Electrical Infrastructure: The First Decision Point

3.5kW (16A, Single Phase)

Compatible with standard household sockets

No need for electrical upgrades

Ideal for environments with limited power availability

7kW (32A, Single Phase)

Requires dedicated high-current outlet

Suitable for locations with stable and compliant wiring

Delivers significantly faster charging

Key takeaway:

If your target market involves temporary sites, residential parking, or emergency charging, 3.5kW is the safer universal option.
If the application supports 32A current, 7kW provides better efficiency and turnaround.

Charging Speed vs Usage Pattern

• 3.5kW prioritizes compatibility and safety

• 7kW prioritizes time efficiency

 For commercial fleets, charging time directly impacts vehicle utilization — this is where 7kW shows clear value.

 Portability and Deployment Flexibility

Both versions are:

Compact and lightweight (≤5 kg)

IP65–IP67 rated for outdoor use

Designed for vehicle trunk storage

However:

• 3.5kW is more tolerant of unknown power sources

• 7kW is better suited for fixed operational routes

Distributors and resellers often offer both:

• 3.5kW as a standard SKU

• 7kW as a performance upgrade

Safety & Power Control Considerations

Both models feature:

• Over-current protection

• Over-voltage & under-voltage protection

• Over-temperature protection

• Leakage & grounding protection

In addition, adjustable current settings allow:

• 3.5kW: 8A / 10A / 13A / 16A

• 7kW: 8A / 10A / 13A / 16A / 32A

This makes both products adaptable across different regulatory environments.

 Which One Should You Offer or Deploy?

Choose 3.5kW if:

• You target residential or mixed-use markets

• You need maximum compatibility

• You prioritize cost control and low installation risk

Choose 7kW if:

• You serve fleet, logistics, or corporate clients

• Charging efficiency is critical

• Infrastructure conditions are known and controlled

For most B2B partners, the best strategy is dual offering, covering both standard and high-performance demand.

Conclusion

3.5kW and 7kW portable EV chargers are not competitors — they are complementary tools.
Understanding the power environment, usage frequency, and operational goals is the key to making the right choice.