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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001096906-07-001752.txt : 20071227
<SEC-HEADER>0001096906-07-001752.hdr.sgml : 20071227
<ACCEPTANCE-DATETIME>20071227172613
ACCESSION NUMBER:		0001096906-07-001752
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20071224
FILED AS OF DATE:		20071227
DATE AS OF CHANGE:		20071227

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:			NYMAN TIM
		CENTRAL INDEX KEY:			0001135142

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50142
		FILM NUMBER:		071329805

	BUSINESS ADDRESS:	
		STREET 1:		C/O GRANITE BAY TECHNOLOGIES INC
		STREET 2:		599 MENLO DR. #200
		CITY:			ROCKLIN
		STATE:			CA
		ZIP:			95765
		BUSINESS PHONE:		(916) 415-0864

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

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-12-24</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001135142</rptOwnerCik>
            <rptOwnerName>NYMAN TIM</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>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2007-12-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3478</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>478478</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Option</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>3.45</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2007-12-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>6225</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2007-12-24</value>
            </exerciseDate>
            <expirationDate>
                <value>2012-12-24</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6225</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6225</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">These shares vest in twelve equal installments beginning on January 31, 2008.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Alan M. Lefko, Power of Attorney for Timothy B. Nyman</signatureName>
        <signatureDate>2007-12-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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