Hi Larry,
I am not aware of a phone number or email for Tesla Energy that is for providing interested persons with Powerwall information. My impression is that currently Tesla Energy is not at the point where anyone who wants to buy a Powerwall can just contact them, make payment, and get a Powerwall delivered. Powerwall production is definitely happening right now at the Gigafactory but I have been told that there are well over 100,000 Powerwall reservations just in the US!
There are some very basic Powerwall specs here
Press Kit | Tesla
Do you just need to know the dimensions of the Powerwall so you can plan a space for it, or is there something else you need to know? You can see from my photos in the thread I started that you need to leave a lot of space for all the other components.
Barry Brisco