Now call me a suspicious old bastard BUT..
That specification sounds just like a generic 12 Volt 100 Watt solar panel.
Here is a typical 100 Watt panel with similar ratings.
NOTE the dimensions - 47 x 21.3 x 1.4 in (1195 x 541)
Per the Tesla Solar home page the shingle is 14" X 8.65" (356 X 220)That gives a surface area of 0.08 square metres.
Standard Test Conditions (STC) for panel rating is 1000W per square metre.
I will be generous and allow Tesla to claim an efficiency of 20%.
This gives a maximum power output of (drum roll)
Fremont....we have a problem!