Only $10 ~ $20k, huh?
What has the utility company charged you for a transformer installation or upgrade on their side of the meter? How flexible/negotiable were they? I have a house in Oakland, CA. with 100A service. To support the PV install I want to do, and for more loads like electric heat (presently all gas)...
diysolarforum.com
Also look at Rosie and Sunny Island.
I have 23kW continuous, 44kW surge for my main system.
The 3-phase one would be 18kW continuous, 33kW surge. It takes in single-phase 120V from grid and makes 3-phase.
Would like to see a rotating mass to provide surge.
There are rotary phase converters to make 3-phase - wonder how they do for that?