Exhibit 23.3

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Solar Power, Inc.
Roseville, CA.

We hereby consent to the use in the Prospectus, constituting a part of this Post-Effective Amendment No.1 to Registration Statement No. 333-14826 on Form S-1A of our report dated March 25, 2008 relating to the consolidated financial statements of Solar Power, Inc. (formerly International Assembly Solutions, Limited), which is contained in that Prospectus.

We also consent to the reference to us under the caption “Experts” in the Prospectus.

/s/   Macias Gini & O’Connell LLP

Sacramento, California

April 28, 2008