Motor controller - http://www.grainger.com/Grainger/items/2LHT9
And last - 1,000 more watts of PV array.
This set up, I know beyond a doubt will work. Lets see... $390.50 + $318.25 + $5,000.00 + the copula and related electrical = YIKES! I think I am going to be sick, excuse me...