Extension Cord for Electric Car Charger

The electric vehicle (EV) revolution is gaining momentum across the United States. While public charging infrastructure is expanding, there might be times when you need to charge your EV at home and your designated charging station isn’t quite within reach. This is where extension cords come in. But hold on – not just any extension cord will do! This blog post delves into the world of EV charging extension cords, exploring the best options, safety considerations, and crucial factors to consider when making your choice.

1. Best NEMA 14-50 Extension Cords For EV Charging

NEMA 14-50 extension cords are ideal for Level 2 EV charging, offering significantly faster charging speeds compared to a standard household outlet. Here are some top contenders:

• Lectron 14-50 Extension Cord: This heavy-duty cord boasts a 50-amp rating and comes in various lengths to meet your needs. It features weatherproof construction and a lighted plug for added convenience.
• GE Heavy Duty Power Cord: This NEMA 14-50 cord offers a reliable option from a trusted brand. It’s constructed with durable materials and is UL-listed for safety.
• Sunbeam Powercord: This offering provides a budget-friendly option for NEMA 14-50 extension cords. It’s a good choice for occasional use but might not be as robust as some other options.

Important Note: Always ensure the NEMA 14-50 extension cord is plugged directly into a dedicated 240-volt outlet on a separate breaker. Never use an adapter to connect it to a standard 120-volt outlet.

2. Best NEMA 5-15 10-Gauge Extension Cords For EV Charging

While not ideal for everyday charging due to slower speeds, NEMA 5-15 10-gauge extension cords can be a temporary solution for Level 1 charging in a pinch. Here are a few options to consider:

• Woods 10-Gauge Power Cord: This 10-gauge extension cord offers a reliable choice for occasional Level 1 charging. It’s constructed with durable materials and comes in various lengths.
• AmazonBasics Heavy Duty Extension Cord: This option provides a budget-friendly 10-gauge cord suitable for temporary Level 1 charging needs.
• SurgeGuard Extension Cord: While not all Level 1 charging situations require surge protection, some cords offer this feature for additional peace of mind.

Crucial Safety Reminder: Never overload a circuit by plugging a high-amp appliance or another extension cord into the same outlet while using a NEMA 5-15 extension cord for EV charging.

1. Considering Cost: Coleman / Southwire Extension Cords

• Both Coleman and Southwire offer readily available 10-gauge extension cords with a NEMA 5-15 plug on one end, allowing connection to a standard household outlet. These cords can be a budget-friendly option for occasional Level 1 charging.
• Pros: Affordable and easy to find at most hardware stores.
• Cons: Limited length options might restrict where you can reach an outlet. May not be as durable as some other extension cords.

2. Prioritizing Flexibility: Flexzilla Pro 10-Gauge Extension Cord

• Flexzilla offers a 10-gauge extension cord that prioritizes flexibility and durability. This can be a good choice if you need a cord that can handle some maneuvering without kinking or tangling.
• Pros: More flexible design compared to standard cords. Lighted plug option available for better visibility at night.
• Cons: Might be slightly more expensive than basic 10-gauge cords.

3. Best J1772 Extension Cords For EV-Specific Charging

J1772 extension cords are specifically designed for EV charging and come equipped with a J1772 connector on one end to plug into your car and a standard outlet plug (NEMA 5-15 or L14-30) on the other end. These cords offer a convenient option for Level 1 or Level 2 charging depending on the outlet type they connect to. Here are a few examples:

• Tesla Mobile Connector with J1772 Adapter: For Tesla owners, this official adapter allows you to connect your Tesla mobile connector to a J1772 charging station or a J1772 extension cord plugged into a compatible outlet.
• Lectron J1772 Extension Cord: This option offers a versatile solution with a J1772 connector on one end and a choice of NEMA 5-15 or L14-30 plug on the other end for Level 1 or Level 2 charging based on the outlet.
• MUSTEK Level 1 & 2 EV Charging Extension Cord: This J1772 extension cord offers a budget-friendly option for Level 1 or Level 2 charging depending on the outlet it connects to.

Remember: Always check your EV’s owner’s manual to ensure compatibility with any J1772 extension cord before purchasing.

3.1. Lectron J1772 40ft Extension Cord:

• This offering from Lectron provides impressive reach with a generous 40-foot length. It features a J1772 connector on one end and allows you to choose between a NEMA 5-15 plug for Level 1 charging on a standard outlet or an L14-30 plug for Level 2 charging on a compatible dryer outlet.
• Pros: Excellent length for reaching distant outlets, versatility for both Level 1 and Level 2 charging depending on the outlet.

3.2. Lefanev J1772 20ft Extension Cord:

• Lefanev offers a more compact 20-foot J1772 extension cord, ideal for situations where a shorter length is sufficient. It also features a J1772 connector on one end and comes with a NEMA 5-15 plug for Level 1 charging on a standard outlet.
• Pros: Compact size for easier storage, suitable for reaching moderately distant outlets.

3.3. Mustart 20ft J1772 20ft 40A Extension Cord:

• This Mustart extension cord boasts a 20-foot length and a 40-amp rating, making it suitable for Level 2 charging on a compatible outlet with sufficient amperage. It features a J1772 connector on one end and an L14-30 plug for Level 2 charging.
• Pros: 40-amp rating enables Level 2 charging for faster charging speeds (compared to Level 1).

4. Why Would You Need An Extension Cord For EV Charging?

There are several reasons why an EV owner might consider using an extension cord for charging:

• Reaching a distant outlet: If your designated charging station at home is out of reach of a standard outlet, an extension cord can bridge the gap.
• Temporary charging solution: When visiting a friend’s place or staying at a location without a dedicated EV charger, an extension cord can offer a temporary charging option.
• Emergency charging (Continued): In a pinch, an extension cord can provide a lifeline if your EV runs low on battery and there’s no charging station readily available.

Important Safety Reminders:

• Extension cords are for temporary use only: Never rely solely on an extension cord as your primary charging solution. The repeated coiling and uncoiling can damage the cord and increase the risk of overheating.
• Inspect the cord before each use: Look for any signs of damage to the cord insulation or plugs. A damaged cord poses a serious fire hazard and should not be used.
• Avoid overloading circuits: Ensure the circuit you’re plugging the extension cord into can handle the additional load of your EV charging. Never overload a circuit by plugging in other high-power appliances while using the extension cord.
• Uncoil the cord fully: A coiled extension cord can trap heat and increase the risk of overheating. Always fully uncoil the cord before use to allow for proper heat dissipation.
• Use the right gauge cord: Never use a cord with a lower amperage rating than your EV charger requires. This can lead to overheating and potential fire hazards.
• Keep the cord dry: Never use an extension cord outdoors in wet conditions or near puddles. Water exposure can lead to electrical shock hazards.

5. What Are The Charger Levels For EVs?

Understanding the different EV charger levels is crucial when choosing the right extension cord:

• Level 1 Charging (Standard Outlet): This is the slowest charging option, typically using a standard 120-volt household outlet (NEMA 5-15) and requiring several hours for a full charge. While a 10-gauge extension cord can be used for occasional Level 1 charging in a pinch, it’s not recommended for regular use due to slow charging speeds and potential safety concerns.
• Level 2 Charging (240-volt Outlet): This significantly faster charging option utilizes a dedicated 240-volt outlet (NEMA 14-50) and can fully charge most EVs in several hours. NEMA 14-50 extension cords are specifically designed for Level 2 charging and offer a safe and reliable solution for temporary charging needs.
• Level 3 DC Fast Charging (DC Fast Charging Stations): These public charging stations offer the fastest charging speeds, capable of adding significant range in a matter of minutes. Extension cords are not applicable for DC Fast Charging.

Always consult your EV’s owner’s manual for recommended charging levels and compatibility information.

6. Not All EV Charging Extension Cords Are Equal

Here’s why choosing the right extension cord for EV charging is critical:

• Safety: A poorly made or improperly used extension cord can pose serious fire hazards. Ensure the cord is rated for the amperage required by your EV charger and features safety certifications like UL (Underwriters Laboratories) listing.
• Durability: EV charging puts a strain on extension cords. Choose a cord constructed with high-quality materials that can withstand repeated use and potential environmental factors.
• Length: Select a cord with sufficient length to reach the desired outlet without excessive tension. Avoid using multiple cords connected together, as this can create safety hazards.
• Weatherproofing (if applicable): If you plan to use the extension cord outdoors for temporary charging, ensure it has a weatherproof rating to protect against moisture and other environmental elements.

Read this article: Portable Generators For Electric Car Charging

7. J1772 Or NEMA 14-50 For EV Charging?

The choice between a J1772 and NEMA 14-50 extension cord depends on your specific needs:

• J1772 Extension Cords: These offer a convenient option with a J1772 connector on one end to plug into your car. They come with either a NEMA 5-15 plug for Level 1 charging on a standard outlet or an L14-30 plug for Level 2 charging on a dryer outlet. J1772 cords are a versatile choice for temporary charging at various locations.
• NEMA 14-50 Extension Cords: These are specifically designed for Level 2 charging using a dedicated 240-volt outlet. They offer faster charging speeds compared to J1772 cords with a NEMA 5-15 plug and are ideal for situations where you have a compatible outlet available.

Consider your charging needs, outlet compatibility, and desired charging speed when making your choice.

8. What Makes A Good NEMA 14-50 Extension Cord For EV Charging?

When selecting a NEMA 14-50 extension cord for Level 2 EV charging, several key factors come into play:

1. Technical specs (wire gauge / current rating):

• Wire Gauge: Choose a cord with a minimum wire gauge rating of 6. A lower gauge number indicates a thicker wire capable of handling higher amperage (current). For Level 2 charging, a 6-gauge cord is typically sufficient for most EVs with a maximum charging current of around 40 amps.
• Current Rating: Ensure the cord’s current rating matches or exceeds the amperage requirement of your EV charger. Check your EV charger’s specifications or consult your owner’s manual to determine the required amperage.

2. Certification:

Look for a NEMA 14-50 extension cord that is UL (Underwriters Laboratories) listed. This signifies that the cord has undergone rigorous safety testing and meets industry standards.

3. Length:

Select a cord with enough length to comfortably reach the desired outlet without excessive pulling or strain. Avoid using multiple cords connected together, as this can create safety hazards and overheating issues.

4. IP Rating (if applicable):

If you plan to use the extension cord outdoors for temporary charging, consider an option with an IP rating. The IP rating indicates the level of protection against dust and water ingress. For occasional outdoor use, an IP rating of IP44 (protection against splashing water) might suffice. However, for more frequent outdoor use, a higher IP rating like IP54 (protection against dust and water sprays from any direction) would be more suitable.

5. Handle comfort:

A comfortable grip on the plug handles can make a difference, especially if you need to frequently connect and disconnect the cord.

6. Cable stiffness:

A balance between flexibility and durability is ideal. While a very stiff cable might be difficult to maneuver, an overly flexible cord could create kinks or tangles that could affect performance or safety.

7. Brand reputation:

Opt for a reputable brand known for producing high-quality electrical products. Reading online reviews and researching brand reputations can provide valuable insights before making your purchase.

Here are some additional tips for using NEMA 14-50 extension cords safely:

• Never overload the circuit: Ensure the circuit you’re plugging the extension cord into is rated for the amperage of your EV charger. It’s crucial to avoid overloading the circuit by plugging in other high-power appliances while using the extension cord.
• Store the cord properly: When not in use, store the cord in a cool, dry place away from direct sunlight. Avoid coiling the cord too tightly, as this can damage the internal wires.

Read this article: Is it safe to charge an electric car in the garage? 2024

FAQs about Extension Cord for Electric Car Charger