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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                  SCHEDULE 13G


                    Under the Securities Exchange Act of 1934
                             (Amendment No: ______)*



                               Enova Systems, Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    29355M200
--------------------------------------------------------------------------------
                                 (CUSIP Number)

                                  June 15, 2006
--------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

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

[ ] Rule 13d-1(b)
[X] Rule 13d-1(c)
[ ] Rule 13d-1(d)

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures  provided  in a prior cover page.

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


CUSIP No. 29355M200

--------------------------------------------------------------------------------
     1.   Names of Reporting Persons.
          I.R.S. Identification Nos. of above persons (entities only).

          GAM Holding AG
--------------------------------------------------------------------------------
     2.   Check the Appropriate Box if a Member of a Group (See Instructions)
          (a)  .................................................................
          (b)  .................................................................
--------------------------------------------------------------------------------
     3.   SEC Use Only

--------------------------------------------------------------------------------
     4.   Citizenship or Place of Organization

          Switzerland
--------------------------------------------------------------------------------
Number of               5.     Sole Voting Power
Shares                  --------------------------------------------------------
Beneficially            6.     Shared Voting Power
Owned by                       789,000
Each Reporting          --------------------------------------------------------
Person With*            7.     Sole Dispositive Power
                        --------------------------------------------------------
                        8.     Shared Dispositive Power
                               789,000
--------------------------------------------------------------------------------
     9.   Aggregate Amount Beneficially Owned by Each Reporting Person

          789,000
--------------------------------------------------------------------------------
     10.  Check if the Aggregate  Amount in Row (9) Excludes  Certain Shares
          (See Instructions)
--------------------------------------------------------------------------------
     11.  Percent of Class Represented by Amount in Row (9)

          5.33%
--------------------------------------------------------------------------------
     12.  Type of Reporting Person (See Instructions)  HC
--------------------------------------------------------------------------------

*GAM Holding AG disclaims beneficial ownership of such securities.

Item 1.
        (a) Name of Issuer   Enova Systems, Inc.
--------------------------------------------------------------------------------
        (b) Address of Issuer's Principal Executive Offices
            19850 South Magellan Drive, Torrance, California 90502
--------------------------------------------------------------------------------


                                     Page 2


Item 2.
        (a) Name of Person Filing
            GAM Holding AG
--------------------------------------------------------------------------------
            Address of Principal Business Office or, if none, Residence
        (b) Klaustrasse 10, 8008 Zurich, Switzerland
--------------------------------------------------------------------------------
        (c) Citizenship
            Switzerland
--------------------------------------------------------------------------------
        (d) Title of Class of Securities
            Common Stock
--------------------------------------------------------------------------------
        (e) CUSIP Number
            29355M200
--------------------------------------------------------------------------------

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

     [ ] (a) Broker or dealer  registered  under  section  15 of the Act (15
             U.S.C. 78o).

     [ ] (b) Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

     [ ] (c) Insurance  company as defined in section 3(a)(19) of the Act (15
             U.S.C. 78c).

     [ ] (d) Investment  company registered under section 8 of the Investment
             Company Act of 1940 (15 U.S.C 80a-8).

     [ ] (e) An investment adviser in accordance
             withss.240.13d-1(b)(1)(ii)(E);

     [ ] (f) An  employee  benefit  plan  or  endowment  fund  in  accordance
             withss.240.13d-1(b)(1)(ii)(F);

     [ ] (g) A  parent  holding  company  or  control  person  in  accordance
             withss.240.13d-1(b)(1)(ii)(G);

     [ ] (h) A savings associations as defined in Section 3(b) of the Federal
             Deposit Insurance Act (12 U.S.C. 1813);

     [ ] (i) A church plan that is excluded from the definition of an
             investment company under section 3(c)(14) of the Investment Company
             Act of 1940 (15 U.S.C. 80a-3);

     [ ] (j) Group, in accordance withss.240.13d-1(b)(1)(ii)(J).


                                     Page 3


Item 4.  Ownership.

Provide the following  information regarding the aggregate number and percentage
of the class of securities of the issuer identified in Item 1.

--------------------------------------------------------------------------------
         (a) Amount beneficially owned: 789,000
--------------------------------------------------------------------------------
         (b) Percent of class: 5.33%

The percentage used herein was calculated based upon a total of 14,792,000
shares of the Company's Common Stock isueed and outstanding as of May 10, 2006,
as set forth in the Company's Form 10-K for the quarterly period ended March 31,
2006.
--------------------------------------------------------------------------------
         (c) Number of shares as to which the person has:

             (i)    Sole power to vote or to direct the vote
--------------------------------------------------------------------------------
             (ii)   Shared power to vote or to direct the vote           789,000
--------------------------------------------------------------------------------
             (iii)  Sole power to dispose or to direct the disposition of
--------------------------------------------------------------------------------
             (iv)   Shared power to dispose or to direct the
                    disposition of                                       789,000
--------------------------------------------------------------------------------

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 five
percent of the class of securities, check the following [ ].

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 or Control Person.

GAM International Management Limited
GAM London Ltd.

This report is filed by GAM Holding AG, a holding company registered in
Switzerland. GAM International Management Limited ("GIML") and GAM London
Limited ("GAM London") are wholly-owned subsidiaries of GAM Holding AG. GIML is
the investment adviser of GAM UK Diversified and GAM London is the investment
adviser of GAM Exempt Trust and St. James's Place Recovery Unit Trust
(collectively, the "Funds") and therefore indirectly own the 789,000 shares of
Common Stock in Enova Systems, Inc. of which the Funds hold.

Item 8.  Identification and Classification of Members of the Group

Not Applicable

Item 9.  Notice of Dissolution of Group

Not Applicable


                                     Page 4


Item 10. Certification

         The following certification shall be included if the statement is filed
         pursuant to ss.240.13d-1(c): 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.

                                    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.

                                     08/02/07
                       -----------------------------------
                                      Date

                                /s/ Hans De Gier
                       -----------------------------------
                                    Signature

                       Hans De Gier, Chairman of the Board
                       -----------------------------------
                                   Name/Title

                                     07/13/07
                       -----------------------------------
                                      Date

                                 /s/ David Solo
                       -----------------------------------
                                    Signature

                              David Solo, Director
                       -----------------------------------
                                   Name/Title

                                     08/02/07
                       -----------------------------------
                                      Date

                               /s/ Bernard Hodler
                       -----------------------------------
                                    Signature

                            Bernard Hodler, Director
                       -----------------------------------
                                   Name/Title


                                     Page 5