In benign weather and very ordinary circumstances, a parked and unused Model 3 will loose about 30% of its charge in a month. This is often called vampire drain or phantom drain and has been talked about extensively over that last few years, mostly from the point of view of complaining about it. In my view it is manageable. You can park at an airport for a month without being plugged in, for example, park at 75% state of charge (SoC) and return a month later at 45% or 40% SoC.
I don’t think this is self discharge; the self discharge rate of modern LiMnNCo battery is a couple of orders of magnitude lower than this rate I believe. Also, when you leave a car for a few weeks or a month I think that transient effects such as cabin overheat protection become negligible. The point of this post is to try to understand the origin and nature of power usage in a long-term parked Tesla.
I would be really interested if any of the experts out there know what this power is used for. What I am wondering is how a model 3 is using about 800 Watt-hours per day? What systems are involved? How often do they run and for how long? How much power do they draw? Does the battery management system (BMS) play a major role? Does the complex nature of a Tesla battery, which involves over 400 individual cells, imply the need for a particularly active battery management system which requires a significant amount of power each day? Any insights and ideas would be much appreciated.
I don’t think this is self discharge; the self discharge rate of modern LiMnNCo battery is a couple of orders of magnitude lower than this rate I believe. Also, when you leave a car for a few weeks or a month I think that transient effects such as cabin overheat protection become negligible. The point of this post is to try to understand the origin and nature of power usage in a long-term parked Tesla.
I would be really interested if any of the experts out there know what this power is used for. What I am wondering is how a model 3 is using about 800 Watt-hours per day? What systems are involved? How often do they run and for how long? How much power do they draw? Does the battery management system (BMS) play a major role? Does the complex nature of a Tesla battery, which involves over 400 individual cells, imply the need for a particularly active battery management system which requires a significant amount of power each day? Any insights and ideas would be much appreciated.