SEC 1745       Potential  persons  who  are  to  respond  to the  collection  of
(02-02)        information  contained  in this form are not  required to respond
               unless the form displays a currently valid OMB control number.

                                                            OMB APPROVAL
                                                    OMB Number: 3235-0145
                                                    Expires: February 28, 2009
                                                    Estimated average burden
                                                    hours per response. . . 10.4


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



                                  SCHEDULE 13G


                    Under the Securities Exchange Act of 1934
                              (Amendment No: 1)*



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

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

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

                                December 31, 2007
--------------------------------------------------------------------------------
             (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).



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                              1,514,275
Each Reporting                       ----------
Person With*            7.           Sole Dispositive Power

                        8.           Shared Dispositive Power
                                       1,514,275
                                      ---------

     9.   Aggregate Amount Beneficially Owned by Each Reporting Person

           1,514,275
          -----------

     10.  Check if the Aggregate  Amount in Row (9) Excludes  Certain Shares
          (See Instructions)

     11.  Percent of Class Represented by Amount in Row (9)

           8.85%
          -------

     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



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).




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: 1,514,275
                                          ---------
          (b)  Percent of class: 8.85%

               The percentage  used herein was calculated  based upon a total of
17,115,000  shares of the Company's  Common Stock isueed and  outstanding  as of
November 14, 2007, as set forth in the Company's Form 10-Q.

          (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        1,514,275
                                                                   -------------
               (iii) Sole power to dispose or to direct the
                     disposition of                                -------------

               (iv)  Shared power to dispose or to direct the
                     disposition of                                    1,514,275
                                                                   -------------

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 Global Diversified and GAM London is the
investment adviser of SJP GAM Managed - Life, SJP GAM Managed - Pension, SJPI
GAM Sterling Managed Fund and SJPI GAM US Dollar Managed Fund (collectively, the
"Funds") and therefore indirectly own the 1,514,275 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




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.

                                             January 18, 2008
                                     --------------------------------
                                                   Date

                                         /s/ Johannes de Gier
                                     --------------------------------
                                                Signature

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

                                             January 18, 2008
                                     --------------------------------
                                                   Date

                                             /s/ Raymond Baer
                                     --------------------------------
                                               Signature

                                        Raymond Baer, Vice-Chairman
                                     --------------------------------
                                                Name/Title

                                             January 18, 2008
                                     --------------------------------
                                                   Date

                                         /s/ Dieter Enkelmann
                                     --------------------------------
                                               Signature

                                        Dieter Enkelmann, Director
                                     ---------------------------------
                                              Name/Title