UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No.     )*

Real Goods Solar, Inc.

(Name of Issuer)

Class A Common Stock, $0.0001 par value per share

(Title of Class of Securities)

75601N302

(CUSIP Number)

September 14, 2016

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

a. ¨ Rule 13d-1(b)

b. x Rule 13d-1(c)

c. ¨ Rule 13d-1(d)

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Page 1 of 9

Page 2 of 9

CUSIP No.    75601N302

Page 3 of 9

CUSIP No.    75601N302

Page 4 of 9

Item 1.

(a) Name of Issuer

Real Goods Solar, Inc. (the “Issuer”)

(b) Address of Issuer’s Principal Executive Offices

833 W. South Boulder Road

Louisville, Colorado 80027-2452

Item 2.

(a) Name of Person Filing

(b) Address of Principal Business Office or, if none, Residence

(c) Citizenship

This Schedule 13G is being filed on behalf of (i) Mitchell P. Kopin, an individual who is a citizen of the United States of America (“Mr. Kopin”), (ii) Daniel B. Asher, an individual who is a citizen of the United States of America (“Mr. Asher”) and (iii) Intracoastal Capital LLC, a Delaware limited liability company (“Intracoastal” and together with Mr. Kopin and Mr. Asher, collectively the “Reporting Persons”).

The Reporting Persons have entered into a Joint Filing Agreement, a copy of which is filed with this Schedule 13G as Exhibit 1, pursuant to which the Reporting Persons have agreed to file this Schedule 13G jointly in accordance with the provisions of Rule 13d-1(k) of the Securities Exchange Act of 1934, as amended.

The principal business office of Mr. Kopin and Intracoastal is 245 Palm Trail, Delray Beach, Florida 33483.

The principal business office of Mr. Asher is 111 W. Jackson Boulevard, Suite 2000, Chicago, Illinois 60604.

(d) Title of Class of Securities

Class A Common stock, $0.0001 par value per share, of the Issuer (the “Common Stock”).

(e) CUSIP Number

75601N302

Item 3. If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

Not applicable.

Item 4. Ownership.

(a) and (b):

(i) Immediately following the closing of the underwritten offering described in the 424B4 prospectus filed by the Issuer with the Securities and Exchange Commission on September 9, 2016 (the “Offering”), each of the Reporting Persons may have been deemed to have beneficial ownership of 55,368 shares of Common Stock, which consisted of (i) 27,273 shares of Common Stock issuable upon conversion of 150 shares of Series A 12.5% Mandatorily Convertible Preferred Stock (the “Preferred Stock”) issued to Intracoastal at the closing of the Offering, (ii) 27,273 shares of Common issuable upon exercise of a warrant issued to Intracoastal at the closing of the Offering (“Intracoastal Warrant 1”) and (iii) 822 shares of Common Stock issuable upon exercise of a second warrant held by Intracoastal (“Intracoastal Warrant 2”), and all such shares of Common Stock in the aggregate represented beneficial ownership of

Page 5 of 9

approximately 7.7% of the Common Stock, based on (1) 662,816 shares of Common Stock outstanding immediately following the closing of the Offering as reported by the Issuer, plus (2) 27,273 shares of Common Stock issuable upon the conversion of 150 shares of Preferred Stock issued to Intracoastal at the closing of the Offering, (3) 27,273 shares of Common Stock issuable upon exercise of Intracoastal Warrant 1 and (4) 822 shares of Common Stock issuable upon exercise of Intracoastal Warrant 2. The foregoing excludes 235 shares of Common Stock issuable upon exercise of a third warrant held by Intracoastal (“Intracoastal Warrant 3”) because Intracoastal Warrant 3 contains a blocker provision under which the holder thereof does not have the right to exercise Intracoastal Warrant 3 to the extent that such exercise would result in beneficial ownership by the holder thereof, together with any persons whose beneficial ownership of the Common Stock would or could be aggregated with such holder’s for purposes of Section 13(d) of the Securities Exchange Act of 1934, of more than 4.99% of the Common Stock. Without such blocker provision, each of the Reporting Persons may have been deemed to have beneficial ownership of 55,603 shares of Common Stock.

(ii) As of the close of business on September 22, 2016, each of the Reporting Persons may be deemed to have beneficial ownership of 31,165 shares of Common Stock, which consisted of (i) 2,835 shares of Common Stock issuable upon conversion of 4.6286 shares of Preferred Stock held by Intracoastal, (ii) 27,273 shares of Common Stock issuable upon exercise of Intracoastal Warrant 1, (iii) 822 shares of Common Stock issuable upon exercise of Intracoastal Warrant 2 and (iv) 235 shares of Common Stock issuable upon exercise of Intracoastal Warrant 3, and all such shares of Common Stock in the aggregate represent beneficial ownership of approximately 4.1% of the Common Stock, based on (1) 662,816 shares of Common Stock outstanding immediately following the closing of the Offering as reported by the Issuer, plus (2) 62,000 shares of Common Stock issued to Intracoastal upon conversion of 145.3714 shares of Preferred Stock held by Intracoastal, (3) 27,273 shares of Common Stock issuable upon exercise of Intracoastal Warrant 1, (4) 822 shares of Common Stock issuable upon exercise of Intracoastal Warrant 2, (5) 235 shares of Common Stock issuable upon exercise of Intracoastal Warrant 3 and (6) 2,835 shares of Common Stock issuable upon conversion of 4.6286 shares of Preferred Stock held by Intracoastal.

(c)

Number of shares as to which each Reporting Person has:

(1) Sole power to vote or to direct the vote: 0 .

(2) Shared power to vote or to direct the vote: 31,165.

(3) Sole power to dispose or to direct the disposition of 0 .

(4) Shared power to dispose or to direct the disposition of 31,165.

Item 5. Ownership of Five Percent or Less of a Class

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than 5 percent of the class of securities, check the following  x.

Item 6. Ownership of More than Five Percent on Behalf of Another Person.

Not applicable.

Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company

Not applicable.

Item 8. Identification and Classification of Members of the Group

Not applicable.

Item 9. Notice of Dissolution of Group

Not applicable.

Page 6 of 9

Item 10. Certification

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under §240.14a-11.

Page 7 of 9

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: September 22, 2016

Page 8 of 9

Exhibit 1

JOINT FILING AGREEMENT

The undersigned acknowledge and agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G may be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

Date: September 22, 2016

Page 9 of 9