<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-08-12</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001425565</issuerCik>
        <issuerName>Real Goods Solar, Inc.</issuerName>
        <issuerTradingSymbol>RSOL</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001448634</rptOwnerCik>
            <rptOwnerName>McCalmont Darlene J.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2959 WINCHESTER BLVD, SUITE 200A</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CAMPBELL</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>95008</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
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            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001448093</rptOwnerCik>
            <rptOwnerName>McCalmont D. Thompson</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2959 WINCHESTER BLVD., SUITE 200A</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CAMPBELL</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>95008</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
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            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

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            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-08-12</value>
            </transactionDate>
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                <transactionCode>S</transactionCode>
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        <nonDerivativeTransaction>
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                <directOrIndirectOwnership>
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                <transactionShares>
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                <directOrIndirectOwnership>
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                <transactionFormType>4</transactionFormType>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
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                <sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
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            </ownershipNature>
        </nonDerivativeTransaction>
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                <transactionPricePerShare>
                    <value>3.18</value>
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                <transactionAcquiredDisposedCode>
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                <sharesOwnedFollowingTransaction>
                    <value>2154112</value>
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                <directOrIndirectOwnership>
                    <value>I</value>
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                <natureOfOwnership>
                    <value>By Trust</value>
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            </ownershipNature>
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                <value>Class A Common Stock</value>
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                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>13350</value>
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                <transactionPricePerShare>
                    <value>3.26</value>
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                    <value>D</value>
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                <sharesOwnedFollowingTransaction>
                    <value>2140762</value>
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                <directOrIndirectOwnership>
                    <value>I</value>
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                <natureOfOwnership>
                    <value>By Trust</value>
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            </ownershipNature>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>35601</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.51</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2105161</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
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                <natureOfOwnership>
                    <value>By Trust</value>
                    <footnoteId id="F1"/>
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            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-09-30</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>18716</value>
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                <transactionPricePerShare>
                    <value>3.65</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2086445</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Trust</value>
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    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">All shares were issued to either Darlene J. McCalmont, in her name alone, or to the McCalmont Living Trust dated September 3, 2004 (&quot;McCalmont Living Trust&quot;).  Darlene J. McCalmont transferred the shares held in her name to the McCalmont Living Trust on September 3, 2004.  The shares are owned directly by the McCalmont Living Trust, and indirectly by D. Thompson McCalmont and Darlene McCalmont as co-trustees and sole beneficiaries of that trust; however, D. Thompson McCalmont expressly disclaims beneficial ownership of such shares.</footnote>
    </footnotes>

    <remarks>/s/ Darlene J. McCalmont and D. Thompson McCalmont, individually and as Co-Trustees of the McCalmont Living Trust dated September 3, 2004</remarks>

    <ownerSignature>
        <signatureName>/s/ Darlene J. McCalmont</signatureName>
        <signatureDate>2010-10-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ D. Thompson McCalmont</signatureName>
        <signatureDate>2010-10-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
