-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 NEe+uInf43R/lvWKDKABUIe7DXxMGyCjz6NWJpnOQ9IHq+I44yFdP3B4/0jSsAsM
 8q2901yfKKlwfS5mEbF0pw==

<SEC-DOCUMENT>0001096906-08-001614.txt : 20080818
<SEC-HEADER>0001096906-08-001614.hdr.sgml : 20080818
<ACCEPTANCE-DATETIME>20080818185031
ACCESSION NUMBER:		0001096906-08-001614
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080818
FILED AS OF DATE:		20080818
DATE AS OF CHANGE:		20080818

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Solar Power, Inc.
		CENTRAL INDEX KEY:			0001210618
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				204956638
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1115 ORLANDO AVENUE
		CITY:			ROSEVILLE
		STATE:			CA
		ZIP:			95661
		BUSINESS PHONE:		916 745-0900

	MAIL ADDRESS:	
		STREET 1:		1115 ORLANDO AVENUE
		CITY:			ROSEVILLE
		STATE:			CA
		ZIP:			95661

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	WELUND FUND INC
		DATE OF NAME CHANGE:	20021216

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Winzeler Jeffrey G
		CENTRAL INDEX KEY:			0001312143

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50142
		FILM NUMBER:		081026089

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		(916) 746-0900

	MAIL ADDRESS:	
		STREET 1:		C/O SOLAR POWER, INC.
		STREET 2:		4080 CAVITT STALLMAN RD, #100
		CITY:			GRANITE BAY
		STATE:			CA
		ZIP:			95746-9460
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-08-18</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001210618</issuerCik>
        <issuerName>Solar Power, Inc.</issuerName>
        <issuerTradingSymbol>SOPW</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001312143</rptOwnerCik>
            <rptOwnerName>Winzeler Jeffrey G</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SOLAR POWER, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>1115 ORLANDO DR.</rptOwnerStreet2>
            <rptOwnerCity>ROSEVILLE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>95611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Finacial Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-08-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3035</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.415</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>28035</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-08-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>6965</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.42</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>35000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>/s/ Alan M. Lefko, Power of Attorney for Jeffrey G. Winzeler</signatureName>
        <signatureDate>2008-08-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----