In Cold Weather, Tesla Model S Vampire Drain Is Higher Than Tesla’s Claimed 1% Per Day
Our friends over at TESLARATI created a small guide, which includes a few tips for parking your Model S (unplugged) long-term.
The report mentions information on “vampire drain”, where the Model S’ battery pack will discharge 1% per day.
Per the Tesla Model S owner’s manual:
“Even when Model S is not being driven, its Battery discharges very slowly to power the onboard electronics. On average, the Battery discharges at a rate of 1% per day. Situations can arise in which you must leave Model S unplugged for an extended period of time (for example, at an airport when traveling). In these situations, keep the 1% in mind to ensure that you leave the Battery with a sufficient charge level. For example, over a two week period (14 days), the Battery discharges by approximately 14%.”
Rob M from TESLARATI parked his Model S for approximately 2.6 days, and noticed he had lost 14 miles of range; 2.3% per day:
“when I parked and I had 186 miles of rated range left (71%). When I returned my Model S reported 172 miles of rated range left (65%). I lost 14 rated miles over the 2.6 days at an average temperature of 16 degrees fahrenheit.”
Obviously, this is a little more than 1% per day.
A note that we would like to add for those who may not be aware: When the Model S is unplugged in cold weather conditions such as this, the battery pack will use some of its own charge (more than this 1% number) to keep itself at an optimum temperature, so the battery does not get damaged.
A few tips from TESLARATI would be to turn “Energy Saving” mode on when you have your Model S parked for multiple days, especially in these cold weather conditions.
Per Rob M at TESLARATI:
“Be smart and plan out your Model S long term parking strategy, especially if there isn’t going to be a charger on site or nearby. Be sure to have enough battery range upon return so that you can get to your destination or to the nearest charging location.”
“Tesla suggests a 1% battery discharge loss per day but you may want to consider a more conservative 3% number to ensure you have plenty of range left upon returning.”