Does TezLab cause Phantom Drain?
No. TezLab does not cause phantom drain.
Phantom drain is the energy (range) lost from the battery when the car is idle. Small amounts of this should be expected for all EVs. This is calculated from the time you put the car in park to the time you put it back into drive to go on your next drive. There are many variables that can result in more or less phantom drain - temperature, software updates, use of climate control/dog mode, multiple apps, and sentry mode are among the biggest factors.
We spend a lot of time carefully considering the sleep needs of Tesla vehicles to ensure that we can both reliably capture data for you, but also allow vehicles to sleep regularly in order to conserve energy.
Letting your vehicle sleep is important - a restless vehicle results in Phantom Drain, and nobody wants that. TezLab’s default sleep mode setting (Deep Sleep Assist) ensures that your vehicle is able to promptly fall asleep when idle to conserve energy. When used as designed with default settings, TezLab does not cause added phantom drain.
We have run countless tests to keep tabs on the energy use of idle vehicles while connected to TezLab and now, this can be visualized using our Pro Usage Report. In recent tests, we let a vehicle sit idle for more than 20 days, during this time, the car slept regularly while connected to TezLab, and recorded a total Idle Range Usage of 3% over 20 days, significantly less than the 1% per day that Tesla says to expect.
If you are using multiple third-party applications, please see "Multiple Third Party Applications & Sleep"
We monitor the aggregate sleep status of the TezLab fleet to ensure that vehicles are generally sleeping regularly. If you are using only TezLab with Deep Sleep Assist enabled, your car will sleep regularly when it is idle.