Why You Should Unreel and Straighten Your EV or PHEV Charger Cord

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Why You Should Unreel and Straighten Your EV or PHEV Charger Cord

Electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs) are at the forefront of revolutionizing our driving experience, offering a greener, cleaner alternative to traditional gasoline-powered cars. As more people make the switch, understanding the best practices for charging your vehicle is crucial. One often overlooked aspect is the importance of fully unreeling and laying out the charger cord in a straight line when charging. But why is this necessary? Let’s dive in.

1. Prevents Overheating

When an EV or PHEV charging cord is left coiled, it can lead to the generation of heat. This phenomenon, known as inductive heating, occurs because the coil can act like an inductor, generating its own magnetic field as electricity flows through it. When the cord is coiled up, this magnetic field is concentrated, and the resistance within the cord can cause it to heat up. By straightening out the cord, you minimize the risk of inductive heating, ensuring a safer charging environment and preserving the integrity of the cord.

2. Reduces Fire Risk

The accumulation of heat from a coiled cord not only poses a threat to the cord itself but also increases the risk of fire. Electrical fires can occur when the insulation around wires melts or when an overheated cord comes into contact with flammable materials. By laying out the cord in a straight line, you ensure that any heat generated is dissipated more efficiently, significantly reducing the likelihood of fire.

3. Ensures Efficient Charging

Efficient energy transfer is key to charging your EV or PHEV effectively. A coiled cord can experience a drop in voltage due to the resistance and inductive heating mentioned earlier. This drop means your vehicle might not charge as efficiently or as quickly as it could if the cord were laid out straight. In essence, a straightened cord ensures that you’re getting the most out of your charging session, saving you time and energy.

4. Extends Cord Life

Regularly charging your vehicle with the cord coiled can lead to premature wear and tear. The heat generated can degrade the materials over time, leading to cracks in the insulation or damage to the wires inside. Furthermore, the physical strain of being kept in a coiled position can weaken the cord. By fully extending the cord, you reduce these risks, ensuring that your charger lasts longer and performs better.

5. Safety First

Beyond the technical reasons, safety is paramount. A straightened cord is less likely to become a tripping hazard or get caught in doors, windows, or other moving parts. Ensuring the cord is visible and out of the way minimizes accidents, protecting you and others around you.

Frequently Asked Questions (FAQs) About EV and PHEV Charging

1. Can I charge my EV/PHEV in the rain?

Yes, you can charge your electric vehicle (EV) or plug-in hybrid electric vehicle (PHEV) in the rain. Charging equipment and connectors are designed to be waterproof and are subjected to rigorous testing to ensure they can safely operate in various weather conditions, including rain. However, it’s important to always use the charging equipment as directed and ensure that all connections are secure to maintain safety.

2. How long does it take to fully charge an EV or PHEV?

The time it takes to fully charge an EV or PHEV depends on several factors, including the vehicle’s battery size, the charging station’s power output, and the type of charger being used (Level 1 AC, Level 2 AC, or DC Fast Charger). Generally, Level 1 charging (using a standard household outlet) can take anywhere from 8 to 20 hours for a full charge, Level 2 charging can reduce this time to about 4 to 6 hours, and DC Fast Charging can provide up to 80% charge in as little as 20 to 30 minutes for compatible vehicles.

3. Is it bad to leave my EV/PHEV plugged in overnight?

No, it’s not bad to leave your EV or PHEV plugged in overnight. In fact, overnight charging is convenient and allows you to take advantage of off-peak electricity rates where available. Most EVs and PHEVs are equipped with smart charging technology that stops the charging process once the battery reaches full capacity, preventing overcharging. However, it’s a good practice to consult your vehicle’s user manual for specific recommendations and to ensure you’re following the best practices for battery health and longevity.

4. Do EV and PHEV batteries degrade over time?

Yes, like all lithium-ion batteries, the batteries in EVs and PHEVs will degrade over time, leading to a gradual decrease in the maximum range of the vehicle. The rate of degradation depends on various factors, including charging habits, climate, and usage. Most manufacturers offer warranties for EV and PHEV batteries, typically guaranteeing a certain level of battery capacity (e.g., 70-80%) for a set number of years or miles. To maximize battery life, it’s recommended to avoid extreme temperatures, regularly maintain your vehicle, and follow best charging practices, such as avoiding consistent charging to 100% and not letting the battery deplete entirely.


While it might seem like a minor detail, fully unreeling and straightening your EV or PHEV charger cord is a simple step that can have significant benefits. From preventing overheating and reducing the risk of fire to ensuring efficient charging and extending the life of your charging equipment, the reasons are compelling. Next time you plug in your vehicle, remember to take a moment to straighten out that cord. It’s a small action that supports the safe, efficient, and long-lasting use of your electric vehicle’s charging system. Happy and safe charging!

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