While conventional cars can also develop issues during extended storage, EVs have additional considerations because the battery management system continues to operate, software can still receive updates, and the vehicle draws a small amount of power even when it appears off. A car cover can help protect the vehicle while it sits, provided it is selected and used in a way that prevents heat, moisture, and other storage-related issues.

Why EVs Need Special Attention During Storage

Before getting into covers, it helps to understand what makes long-term EV storage different. A gasoline car parked for months mainly faces a flat battery, stale fuel, and flat-spotted tires. An EV has all of that along with a high-voltage lithium-ion pack that degrades faster when stored at the wrong charge level or exposed to sustained heat.

High temperatures can speed up battery degradation, with the effect becoming more significant when a lithium-ion battery is stored at a high charge level. A cover that traps heat against the vehicle during outdoor storage actively works against battery health, not just paint condition.

Choosing the Right Cover for an EV

A good EV cover should protect the vehicle from the elements without trapping heat or moisture underneath.

Breathability Is Non-Negotiable

For any vehicle stored outdoors, a breathable cover is essential. For an EV, it’s especially important. The electronics and battery pack generate low levels of residual heat even when the car is off, and a sealed non-breathable cover traps that heat underneath rather than allowing it to dissipate.

A breathable, multi-layer cover helps release trapped moisture while reducing condensation on the vehicle’s surface and limiting the damp conditions that can contribute to mold and corrosion.

Avoid Plastic or Vinyl Covers

Cheap plastic covers trap heat and moisture together, scratch paint when wind causes movement, and attract dust through static buildup. None of that is acceptable for any car, and it’s worse for an EV that may sit for months.

Fit Matters

A properly fitted cover stays in place, doesn’t bunch up and pool water, and maintains even contact across the panels. Loose covers flap in wind, create friction against paint, and allow water entry at the edges.

Many EV manufacturers offer model-specific covers for this reason, and a custom-fit cover performs significantly better than a universal size. For example, a Tesla car cover designed for a specific Tesla model can provide a closer fit around the vehicle’s contours while helping protect the paint during extended storage. Brands such as Seal Skin Covers offer vehicle-specific options designed to provide a closer fit and dependable protection during outdoor storage.

Indoor vs Outdoor Storage

Where the car is stored shapes the cover decision.

  • Indoor storage in a climate-controlled space: A light indoor cover is appropriate here, primarily to keep dust off the paint. It doesn’t need to be waterproof, and breathability is less critical because temperature and humidity are stable. A soft microfiber or flannel-lined cover is the right choice.
  • Garage storage without climate control: Temperature can still swing significantly in an uninsulated garage, particularly in summer. A breathable cover is still useful here, mainly to manage condensation from overnight temperature drops. Avoid anything that seals the car.
  • Outdoor storage: This is the most demanding storage situation. The cover should provide UV protection, water resistance, and good breathability. For an EV that will remain outside for more than a few weeks, a durable, multi-layer cover designed for the local climate is a worthwhile investment. For pickup truck owners, a truck cap can also work well alongside a vehicle cover, adding another layer of protection for the truck bed and its contents during extended outdoor storage.

Battery and Charge Level Before Storage

The cover itself cannot make up for improper storage conditions. For extended storage, following the vehicle manufacturer’s recommended battery charge level can help maintain battery health. A full charge stored for months stresses the cells; a very low charge risks over-discharge if the battery management system continues drawing power.

It is also a good idea to disable unnecessary features, such as scheduled climate control or frequent remote access, before leaving the vehicle in storage. Some newer EVs have a dedicated storage or transport mode that reduces background power consumption significantly during storage.

Keeping the Cover in Good Condition

The cover also requires regular care, much like the car itself:

  • Clean the cover before putting it on the car. Dirt and grit trapped between the cover and the paint surface can cause fine scratches over time, particularly during any movement caused by wind.
  • Let the cover dry completely before folding and storing it. A damp cover stored in a bag develops mildew quickly, which transfers to the vehicle surface.
  • Inspect periodically underneath the cover. Monthly checks catch moisture buildup, mold, or fit issues before they cause damage.
  • Remove the cover during any charging session if the car is connected to a charger during storage. Heat generated during charging needs to escape.
  • Wash the cover after storage. Road film, bird droppings, and grime embedded in the fabric affect future performance.

Preparing the EV Before It Goes Under the Cover

A few steps before covering the car make a meaningful difference over a long storage period.

Wash and dry the car thoroughly. Leaving dirt, sap, bird droppings, and other residue on the vehicle for extended periods can lead to stubborn stains and gradually degrade the paint’s protective clear coat. Apply a wax or paint sealant before covering to add an extra barrier between the paint and moisture.

Check tire pressures and inflate to the upper end of the recommended range. Tires lose pressure gradually during storage, and starting higher reduces the risk of flat spots.

Disable any alerts or notifications that prompt the car to wake from sleep mode repeatedly. Repeated wake cycles drain the 12V auxiliary battery and draw from the high-voltage pack.

Checking on the Car During Long-Term Storage

A monthly check is worth building into the routine. Take off the cover periodically to look for moisture or mold, check the tires, and make sure the battery charge is still at an appropriate level. Check the area around the vehicle for signs of water pooling, pest activity, or debris buildup, especially after heavy rain or storms.

Keeping an EV in storage for an extended period can be fairly simple with the right preparation. The right cover, the right charge level, and periodic attention are what keep an EV in good shape until it’s ready to drive again.

Author Bio

Mark Adams is a content writer and automotive research specialist at Seal Skin Covers, specializing in vehicle and outdoor protection solutions. He focuses on helping readers safeguard their investments through practical care tips, storage advice, and product insights. With a strong interest in automobiles and vehicle maintenance, Mark enjoys exploring ways to extend the life and performance of cars, trucks, and recreational vehicles.