Inteset Level 2 EV Charger Extension Cord (Made in USA) Review
The Inteset Level 2 EV Charger Extension Cord is a high-quality, durable, and efficient solution for extending the reach of an SAE J1772-compatible Level 2 EV charger. Available in 40-amp and 48-amp versions with 12, 21, and 30-foot length options, it features weather resistance, a flexible design, and UL-certified safety, making it a reliable choice for both home and public level 2 EV charging.
The Inteset Level 2 EV Charger Extension Cord is a top-tier, USA-made solution for safely extending the reach of your SAE J1772-compatible Level 2 EV charger. It supports Level 1 EV charging and Level 2 EV charging.
We also highly recommend this extension cord for EV owners who use public EV chargers in commercial and industrial settings with three-phase electrical power or split-phase systems which are common in the United States. In these cases, you are limited to an SAE J1772 female-to-male extension cord, such as the Inteset Level 2 EV Charger Extension Cord, since alternative options like NEMA extension cords are not compatible. This extension cord provides the extra reach needed to connect to a charger when your parking spot isn’t directly adjacent.
How It Works
Designed as a reliable extension solution, the Inteset Level 2 EV Charger Extension Cord seamlessly extends the reach of your SAE J1772 Level 2 EV charger. It features a female SAE J1772-compatible receptacle that securely connects to your charger’s J1772 connector. At the other end, a male J1772 connector plugs directly into your EV’s charging port, ensuring full Level 2 charging performance without loss of efficiency or safety.
⚠ Important Connection Sequence:
For the extension cord to function correctly, you must first plug the extension cable into the charger connector before plugging it into the EV. The extension cable must receive power first; otherwise, it will not send the required signal to the charger to initiate charging.
Connection Process (as shown in the diagram above):
- Power Source to EV Charger – The charging station is connected to its power source.
- EV Charger to Extension Cord – The charger’s J1772 connector plugs into the extension cord’s female inlet.
- Extension Cord to Vehicle – The extension cord’s J1772 connector plugs into the EV’s charging inlet.
Compatibility
The Inteset Level 2 EV Charger Extension Cord is fully compatible with all SAE J1772 Level 1 and Level 2 EV chargers, as well as electric vehicles that comply with SAE J1772 standards.
The Society of Automotive Engineers (SAE) defines the physical, electrical, communication, and performance requirements for vehicle inlets and connectors, ensuring seamless interoperability across J1772-compliant chargers and EVs. This guarantees a reliable, high-performance charging experience for a wide range of electric vehicles.
The Inteset Level 2 EV Charger Extension Cord is designed for seamless compatibility with both plug-in (portable EV chargers) and hardwired Level 2 EV chargers featuring an SAE J1772 connector.
- 40-Amp Inteset Level 2 EV Charger Extension Cord: We recommend the 40-amp version for use with Level 2 chargers rated up to 9.6 kW, such as those for the Jeep, Hyundai IONIQ, Ford F-150 Lightning, Honda Prologue, Chevrolet Equinox EV, Cadillac Lyriq, and Rivian R1S.
- 48-Amp Inteset Level 2 EV Charger Extension Cord: If you have a Level 2 EV charger with a maximum output of 11.5 kW—such as the Emporia EV Charger, Wallbox Pulsar Plus, Lectron V-Box, or Grizzl-E Ultimate—opt for the 48-amp J1772 EV extension cord to ensure safe and efficient power delivery.
The Inteset Level 2 EV Charger Extension Cord is marketed as compatible with Level 1 EV chargers, but using it exclusively for Level 1 EV charging will be overkill—unless you want to future-proof your EV charger installation or have a dual-voltage Level 1 & Level 2 EV charger such as the Webasto Go Dual Voltage Portable EV Charger.
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For Dual-Voltage Chargers: If your EV charger supports both Level 1 (120V) and Level 2 (240V) charging, we recommend a high-current extension cord like the Inteset Level 2 EV Charger Extension Cord to handle the increased power capacity safely.
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For Dedicated Level 1 Charger: If you own a Lectron Level 1, Jeep, Tesla Mobile Charger, Nissan Leaf, Kia, or other OEM Level 1 charger, a budget-friendly alternative is the EP Level 1 EV Charger Extension Cord, which supports 15 amps and is optimized for Level 1 charging needs.
Choosing the right extension cord guarantees seamless compatibility, optimal safety, and cost-effective performance for your EV charging setup.
Key Features
The Inteset Level 2 EV Charger Extension Cord is a reliable EV charging accessory that extends the reach of an SAE J1772 Level 2 EV charger, making it easier to charge vehicles when a charging station is out of reach. It is compatible with all Level 1 and Level 2 J1772 chargers and electric vehicles using the J1772 standard, its key features include:
High Power Handling
The Inteset Level 2 EV Charger Extension Cord features a heavy-duty 8 AWG all-copper cable. However, 8 AWG wiring has limitations when used with higher amperage Level 2 chargers. While it is well-suited for 32A Level 2 chargers, which typically run on circuits with 8 AWG wiring, it is not optimal for 40A and 48A chargers.
For more details, refer to our guide on selecting the right EV charger wire gauge for your charging setup.
- A 40A charger operates on a 50A circuit with 6 AWG wiring.
- A 48A charger requires a 60A circuit with 4 AWG wiring.
This gauge mismatch can lead to:
- Voltage Drops – Reduced efficiency and slower charging speeds.
- Heat Buildup – Increased risk of overheating, especially under continuous high-load charging.
- Higher Electrical Resistance – Potential strain on the EV branch circuit, shortening the lifespan of the setup.
For quick top-ups or occasional use, the Inteset Level 2 EV Charger Extension Cord is a practical solution. However, for extended charging sessions or permanent setups, especially with large-capacity EV batteries, this extension cord may increase circuit stress, reduce charging efficiency, and accelerate wear on the charging infrastructure, potentially shortening the lifespan of the setup.
Durable and Weather-Resistant
Designed for indoor and outdoor use, the extension cord has an IP65 rating, protecting it from dust and low-pressure water jets. While it is weather-resistant, it should not be submerged in water. This durability makes it ideal for use in both outdoor and indoor EV charging in home garages, driveways, and public charging stations.
Portable and Easy to Handle
The lightweight and flexible design allows for easy handling and storage. It includes a carrying bag for portability, making it convenient for travel. The ultra-flexible cable remains pliable in cold weather, preventing stiffness and making coiling effortless.
Universal Compatibility
This extension cord works with all SAE J1772-compatible vehicles, including Tesla models when using a J1772 adapter. It is compatible with Level 1 and Level 2 chargers but does not work with Tesla Wall Connector chargers.
Secure and Efficient Connections
All pins in the J1772 connectors are machine-crimped for improved conductivity and strength. This design reduces electrical resistance, preventing overheating and ensuring a reliable circuit connection between the charger and the vehicle.
UL Recognized for Safety
Built with UL-listed components, the Inteset Level 2 EV Charger Extension Cord meets stringent safety standards, minimizing the risk of electrical hazards. Its UL-recognized parts—including the connector (cRUus E364477), receptacle (cRUus E364477), and cable (UL 62)—ensure reliability. The UL 62-rated cable supports safe operation at temperatures up to 105°C (221°F) in dry conditions and 60°C (140°F) in wet environments.
Most Level 2 EV chargers we have tested typically operate within an ambient temperature range of -30°C to +50°C (-22°F to +122°F) and a storage range of -40°C to +50°C (-40°F to +122°F), with humidity tolerance up to 85% (operating) and 95% (non-operating) at 50°C (122°F). The extension cord’s thermal rating aligns with these industry standards, providing reliable performance without overheating or compromising efficiency under normal operating conditions.
Multiple Length Options
The extension cord is available in 12, 21, and 30-foot lengths, with 48-amp versions available in 20 and 30 feet. These options provide flexibility for different charging setups, whether at home or in public locations. Although the Inteset Level 2 EV Charger Extension Cord is available in various lengths, the gauge of the wire used poses a threat when coupled with higher amperage 40A and 48A Level 2 EV chargers, the longer the cable length the higher the chances of voltage drops, heat build-up, and high electrical resistance, we recommend picking the shortest length that fits your needs.
Assembled and Supported in the USA
Manufactured near Boston, Massachusetts, the extension cord undergoes rigorous quality control and testing before distribution, ensuring quality assurance (QA) and quality control (QC). Unlike cheaper EV charger extension alternatives, Inteset Technologies provides reliable support and repair services, guaranteeing long-term performance.
Two-Year Warranty
The product includes a two-year warranty, covering manufacturing defects and ensuring customer satisfaction. If the cable is damaged, Inteset offers repair or replacement services to maintain charging reliability.
Compatible Level 2 EV Chargers
We tested multiple SAE J1772-compatible Level 2 EV chargers, including 40A and 48A models, with the Inteset Level 2 EV Charger Extension Cord to assess performance. The results confirmed the reliable operation of 240V x 40amps (kW) on the 40 amps version, and 240 volts x 48amps (11.5kW) on the 48 amps version without significant voltage drops or cable overheating. However, due to the limitations of its 8 AWG wiring, we recommend using this extension cord with Level 2 EV chargers rated up to 240V @ 32A (7.7kW), such as:
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