OK - I was told to basically go online and apply for solar and powerwalls.
After I took a stab at how many KW of panels and how many powerwall units I will need, I paid the refundable $95.
Then I went to my Tesla account and took a lot of pictures - power meter, heat pump labels, garage, fuse box, last power bill showing monthly usage over the past year or two, etc, etc., and then I uploaded them (group at a time).
This saves the cost of hiring a guy/gal to come out and take those pictures.
Now they take a look at what I requested and will suggest a system and give me an official quote.
Federal Discounts:
4 KW solar 10600 - 3180 = 7420
you can scale that up in multiples of 4 KW upto a max of 4 systems (16 KW) - discount scales too
They say each 4 KW system provides ~18 KWh daily on average (or 30 * 18 = 540 KWh per month)
Powerwall (unit costs)
1st unit: 7800 - 2340 = 5460
2nd unit: 7800-2100=5700
3rd unit: 7800-2100=5700
4th unit: 7800-2100=5700
I'm not sure why the first unit has an extra $240 discount.
State Discounts:
$1000 for buying anything offered
Doesn't scale up - $1000 and that is what you get.
Next, they will design a system and then contact me and discuss their proposed design.
Glad I didn't pay money for some person to come out and upload pictures.
I'll keep updating my progress.
I proposed 12 KW and 2 powerwalls, although they proposed to pair a powerwall with every 4 KW installed.
Perhaps I'll downsize to 8 KW, but I use between 1700 and 2300 KWh per month and want to cover as much of it as possible.
I'm also charging about 10 KWh on the model S daily, so that is a factor.