Charging Electric Vehicles Using Public Outdoor Electric Chargers. Modern Electric Cars in Use. Future of Transportation.

Can electric cars lose charge when parked? Is it OK to leave your EV plugged in overnight?

Can electric cars lose charge when parked? Is it OK to leave your EV plugged in overnight? We have you covered!

Electric cars are becoming super popular, thanks to lots of good reasons like helping the environment, saving money, and the government’s plan to replace regular cars with electric ones. It totally makes sense why everyone is getting excited about them!

But, here’s the thing – electric cars don’t have the familiar fuel gauge like regular cars. So, it’s a bit like learning a new skill to figure out how your cool electric car keeps its charge and how far you can go on a single charge.

Normally, a fully charged electric car can take you around 400 km, which is pretty awesome. But, what happens when it’s just chilling in the parking lot? Do you lose some charge? How much it lose the charge? Or Can you sleep in the EV cars while the AC is turned on?

That’s the mystery we’re going to uncover!

Can electric cars lose charge when parked?

Electric cars can lose charge when parked, but the rate at which this happens depends on several factors. Unlike traditional cars that use internal combustion engines, electric cars rely on batteries to store and provide energy for propulsion. Here are some key points to consider:

Young mother with child charging electro car at the electric gas station.
  1. Vampire Drain: One common reason for electric cars losing charge when parked is a phenomenon known as “vampire drain.” This occurs when the car’s systems, such as the computer, sensors, and even some safety features, continue to consume small amounts of energy even when the vehicle is not in use. While these energy losses are usually minimal, they can add up over time, especially if the car is parked for an extended period.
  2. Battery Chemistry: The type of battery used in an electric car plays a crucial role in how much charge is lost when parked. Different electric cars use various battery chemistries, and some may have higher or lower self-discharge rates. Newer battery technologies tend to have lower self-discharge rates, helping to minimize the loss of charge during idle periods.
  3. Temperature Effects: Temperature also influences the rate of charge loss. Extreme temperatures, whether hot or cold, can affect battery performance. In very cold conditions, the battery may lose some of its charge capacity temporarily. On the other hand, high temperatures can accelerate the natural degradation of the battery over time, reducing its overall lifespan.
  4. Software Updates and Connectivity: Some electric cars receive software updates and may connect to the internet for various purposes. These updates and constant connectivity can contribute to energy consumption even when the car is parked. However, automakers are working to optimize software and improve energy efficiency to minimize such losses.
  5. Parasitic Loads: Besides the essential systems like computers and sensors, there can be other “parasitic loads” such as interior lights, entertainment systems, and connected devices that draw power from the battery when the car is parked. Ensuring that all systems are turned off or in an energy-saving mode can help reduce these losses.
  6. Parked Duration: The duration for which an electric car is parked matters. If a car is left parked for an extended period without being plugged in, the cumulative effect of vampire drain and other factors can lead to a noticeable decrease in charge. Regularly using and charging the car helps mitigate this issue.

How much does your electric car lose charge while parked?

It depends on factors like vampire drain and how your car is affected. If only essential systems are active, the charge loss is minimal.

Typically, an electric car may lose about 2-3% of its charge per month when parked and not driven. For instance, if your EV has a 200-mile range, you might expect a loss of around 4 to 6 miles over a month.

However, it’s important to note that using external apps that keep the car ‘awake’ when not in use can lead to a higher charge loss, according to current understanding of electric car batteries.

Man Plugging In Electric Car Outside Office In Car Park Charging.

Is it OK to leave your EV plugged in overnight?

Leaving your electric vehicle (EV) plugged in overnight is generally okay and, in fact, is a common practice among EV owners. Charging an EV overnight offers several benefits and considerations:

  1. Convenience and Readiness: Plugging in your EV overnight is convenient because it ensures that your vehicle is ready to go in the morning with a full or nearly full charge. This can be especially advantageous for daily commutes or any unexpected trips that may arise during the day.
  2. Charging Infrastructure: Most modern electric vehicles and charging stations are designed with safety features that prevent overcharging. Once the battery reaches its full capacity, the charging process usually stops automatically. This safeguards the battery and ensures that it doesn’t get damaged due to overcharging.
  3. Scheduled Charging: Many EVs come equipped with features that allow you to schedule charging times. This enables you to take advantage of lower electricity rates during off-peak hours, potentially saving you money while charging overnight. It also contributes to grid efficiency by distributing the demand for electricity more evenly.
  4. Battery Management Systems: Electric vehicles are equipped with sophisticated Battery Management Systems (BMS) that monitor and manage the charging process. These systems ensure that the battery operates within its optimal temperature and voltage ranges, enhancing its overall lifespan.
  5. Home Charging Safety: Home EV chargers are designed with safety features to protect against electrical faults. It’s essential to use a reputable and certified charging station, follow manufacturer guidelines, and ensure your home electrical system is properly installed and maintained.
  6. Battery Health Considerations: While leaving an EV plugged in overnight is generally safe, there are considerations for long-term battery health. Charging to 100% frequently and keeping the battery at high states of charge for extended periods can contribute to faster battery degradation. Many EV manufacturers recommend keeping the battery level between 20-80% for daily use to optimize longevity.
  7. Environmental Considerations: Charging an electric vehicle overnight often aligns with times when electricity demand is lower, contributing to a more efficient and environmentally friendly use of resources. This helps to balance the load on the electrical grid and may rely on renewable energy sources during off-peak periods.

Leaving your electric vehicle plugged in overnight is a practical and generally safe practice. It not only ensures that your EV is ready for use but also takes advantage of features like scheduled charging and the safety mechanisms built into the charging infrastructure.

However, it’s essential to follow manufacturer guidelines, use certified charging equipment, and consider long-term battery health by avoiding frequent charging to 100% capacity. Overall, overnight charging contributes to the convenience and efficiency of owning an electric vehicle.

Danger of sleeping in car: adult casual female driver tired of waiting on parking or having long road down napping on front seat on parking stop. Frustrated woman asleep riding vehicle for long time (Danger of sleeping in car: adult casual female driv

Can you sleep in an electric car with the AC on?

Unlike the common practice that you shouldn’t sleep in the car with the AC on, doing the same thing in the electric car is possible, but there are important considerations to ensure safety, comfort, and efficiency:

  1. Ventilation and Safety: Electric cars often come equipped with advanced climate control systems, including air conditioning (AC). Using the AC while sleeping can provide ventilation and maintain a comfortable temperature inside the car. However, it’s crucial to ensure proper ventilation to prevent the accumulation of carbon dioxide. Crack a window or slightly open a sunroof to allow fresh air circulation.
  2. Battery Management: Running the AC in an electric car while parked can impact the battery’s charge. Most electric vehicles have a feature called “camping mode” or a similar setting designed for such scenarios. This mode allows you to maintain a comfortable temperature without depleting the battery significantly. It’s advisable to check your car’s manual or settings to understand its capabilities and limitations.
  3. Battery Level Monitoring: Before settling in for the night, check the battery level of your electric car. Ensure it has sufficient charge to run the AC without draining the battery to a critically low level. Modern electric vehicles often have systems that automatically manage the battery and may turn off the AC if the battery level becomes too low.
  4. Noise Considerations: Electric vehicles are known for their quiet operation, which can be an advantage for sleeping. However, running the AC may produce some noise. Consider the noise level of your car’s climate control system and whether it might affect your ability to sleep peacefully.
  5. Climate Control Settings: Familiarize yourself with the specific climate control settings of your electric car. Some models allow you to set a timer or specify a duration for running the AC, helping you conserve energy while maintaining a comfortable sleeping environment.
  6. Comfort and Insulation: Sleeping in a car, electric or otherwise, can be more comfortable with proper insulation. Consider using shades or curtains to block out light and regulate the temperature inside. Additionally, bring suitable bedding and clothing to ensure a good night’s sleep.
  7. Safety Precautions: Always prioritize safety when sleeping in a vehicle. Choose well-lit and safe parking locations, and be aware of local regulations regarding overnight parking. Ensure your car is securely parked, and be mindful of security concerns.
  8. Legal Considerations: Some areas may have regulations or laws regarding overnight stays in vehicles. It’s essential to be aware of local ordinances and follow any restrictions in place.

Familiarizing yourself with your electric car’s specific capabilities and settings will enhance your experience when using it as a temporary sleeping space.


Electric cars bring us cool possibilities, from easy overnight charging to creating a cosy spot for a quick nap. Charging overnight is handy, ensuring your car is good to go every morning. But, it’s like taking care of a plant – do it right, and your car’s battery stays happy for a long time. And how about those catnaps with the AC on? It’s like having a comfy corner wherever you go. By making smart choices, like understanding your car’s battery needs and enjoying its cosy corners, you’re not just driving, you’re embracing a whole new electric lifestyle!

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