So you need your serial number but can't find it? Choose your system and follow the below steps.
Tesla Powerwall Gateway(instructions below)
Locate Your Powerwall Gateway information
1. Open the door of the Backup Gateway by pressing the latch located on the right hand side of the unit (in the middle).
2. The serial number is located on the line called "TSN:" which stands for Tesla Serial Number (see the below example)
Alpha Serial Number is starting with "AL" see the below example.