Leaving an Electric Car Unattended for Extended Periods: What You Need to Know
If you’re considering purchasing an electric vehicle (EV) but worry about leaving it unused for months, you’re not alone. Many potential buyers face this dilemma, especially those who travel frequently or have seasonal residences. The good news is that with proper preparation and understanding of EV battery maintenance, you can safely leave your electric car unattended for a considerable time.
Understanding EV Battery Discharge Rates
When left stationary, EV batteries gradually lose their charge. Experts estimate that most EV batteries lose between 1-2% of their charge monthly. This rate can vary depending on several factors, including the vehicle’s make and model, battery health, and environmental conditions.
Best Practices for Storing Your EV
- Charge to 80%: Before leaving your EV unattended, charge the battery to about 80% capacity. This level is considered optimal for long-term storage as it minimizes stress on the battery.
- Avoid Full Charge: Storing an EV with a fully charged battery can be detrimental to its long-term health. An 80% charge strikes a balance between ensuring you have some power available when you return and minimizing battery degradation.
- Don’t Leave It on Charge Continuously: While modern EVs have safeguards against overcharging, it’s not recommended to leave your vehicle plugged into a standard three-pin socket for extended periods. These sockets aren’t designed for continuous high-power use and could pose a risk.
- Maintain the 12V Battery: To prevent parasitic drain from flattening the 12V battery (which powers ancillary systems), consider either disconnecting it or using a trickle charger to keep it topped up.
- Tyre Pressure Adjustment: Increase the tyre pressure to around 50psi to prevent flat-spotting. Remember to return the pressure to normal before driving.
What to Expect When You Return
Even after several months, an EV stored with an 80% charge should retain a significant amount of power. At a 2% monthly loss rate, it would take over three years for the battery to completely drain. Moreover, EVs are designed so that even when they show zero charge, there’s still a residual amount to prevent the battery from completely flattening, which could harm its health.
By following these guidelines, you can ensure your electric vehicle remains in good condition while it’s unattended, ready to hit the road when you are.
