I currently have a residential solar photo voltaic system rated at 4.293 kW CEC-AC.
And that has worked well to offset my electric usage. The system was designed to replace 100% of my usage. (3 yr old system).

I now want to expand my system to include enough capacity to charge a plug-in electric car. Can anyone provide a minimum and maximum estimate? I will buy the plug-in est. 2012, but I want to upgrade my residential solar now to take advantage of State and Federal credits.

The solar contractors have not been much help in this area.

Any comments will be appreciated.