JOINT FILING AGREEMENT

The undersigned hereby agree that the statement on Schedule 13D with respect to the Common Stock of SatCon Technology Corporation is, and any amendment thereto signed by each of the undersigned shall be, filed on behalf of each undersigned pursuant to and in accordance with the provisions of 13d-1(k) under the Securities Exchange Act of 1934, as amended.

Dated: November 19, 2007 

RockPort Capital Partners II, L.P.
By:	RockPort Capital II, LLC
Its:	General Partner
By:	/s/ Stoddard M. Wilson
Name:	Stoddard M. Wilson
Title:	Managing Member
RockPort Capital II, LLC
By:	/s/ Stoddard M. Wilson
Name:	Stoddard M. Wilson
Title:	Managing Member
	/s/ Alexander Ellis III
Alexander Ellis III
	/s/ Janet B. James
Janet B. James
	/s/ William E. James
William E. James
	/s/ Charles J. McDermott
Charles J. McDermott
	/s/ David J. Prend
David J. Prend
	/s/ Stoddard M. Wilson
Stoddard M. Wilson