Is it Harmful to Leave Your EV Plugged In All the Time?

Leaving your electric vehicle (EV) plugged in all the time is generally not harmful, but there are some considerations to keep in mind. This article will explore the benefits and drawbacks, discuss battery management systems, and provide best practices to ensure your EV remains in top condition.

Benefits and Drawbacks

While there is very little risk in leaving your EV plugged in, it remains a very bad idea in certain scenarios. Some EVs will remain in a higher state of readiness, which means a greater drain on the 12-volt battery. This battery is recharged by the traction battery, but an algorithm often does not take into account the high level of usage, leading to frequent issues where the car won't start, and you may need the 12-volt battery boosted.

Battery Management Systems

Most modern EVs are equipped with sophisticated battery management systems that regulate charging. These systems typically stop charging once the battery reaches full capacity and can maintain the battery at an optimal level. However, keeping the battery at 100% charge for extended periods can lead to gradual degradation over time. It's often recommended to keep the battery charge level between 20% and 80% for optimal longevity.

Temperature Effects

Extreme temperatures, both hot and cold, can affect battery health. When an EV is left plugged in in very hot conditions, the battery management system may activate cooling mechanisms, which can help but are not a substitute for monitoring temperature conditions.

Trickle Charging

Some EVs have a trickle charge feature that allows them to stay plugged in without continuously drawing power. This feature helps maintain the battery without overcharging. This is an effective way to keep your EV charged with minimal impact on the battery.

Convenience vs. Longevity

For many users, the convenience of always having a fully charged vehicle outweighs potential long-term degradation. If you drive regularly and keep your vehicle charged, the occasional full charge is unlikely to cause significant harm. However, it’s important to practice good charging habits to ensure the long-term health of your EV.

Best Practices for Charging

Avoid Keeping the Battery at 100% Charge for Long Periods: When possible, keep the battery charge level between 20% and 80% to optimize longevity. Use Charging Timers: Limit charging to times when it is necessary to avoid unnecessary power usage. Charging timers can be programmed to start charging only when it’s beneficial. Monitor Battery Health: Regularly check your battery health through your EV's app or dashboard. Early detection of issues can help prevent significant problems.

In summary, while it’s not harmful to leave your EV plugged in all the time, practicing good charging habits can help extend the life of your battery. By managing your charging schedule and monitoring your battery's health, you can ensure your electric vehicle remains reliable and efficient over the long term.