[Letterhead of Crosby, Heafey, Roach & May]

                                               CHRM _Crosby, Heafey, Roach & May

                                  June 6, 2002

Enova Systems, Inc.
19850 South Magellan Drive
Torrance, CA  90502

        Re: Enova Systems, Inc.
            Form S-1 Registration Statement

Ladies and Gentlemen:

We have acted as counsel to Enova Systems,  Inc., a California  corporation (the
"Company"),  in connection  with the  registration  under the  Securities Act of
1933,  as amended  (the  "Act"),  of up to Six Million  Three  Hundred  Thousand
(6,300,000)  shares of the Common Stock of the Company (the "Shares") to be sold
for the account of a selling shareholder pursuant to a Registration Statement on
Form S-1 (File No. 333-85308), filed with the Securities and Exchange Commission
(the "SEC") on April 1, 2002,  as amended  from time to time (the  "Registration
Statement").

This opinion is being furnished in accordance  with the  requirements of Item 16
of Form S-1 and Item 601(b)(5)(i) of Regulation S-K.

As such counsel,  we are familiar with the  proceedings  taken by the Company in
connection with the authorization, issuance and sale of the Shares. In addition,
we have examined originals or copies of (i) the Amended and Restated Certificate
of Incorporation of the Company,  (ii) the Bylaws of the Company;  (iii) certain
resolutions  of the Board of  Directors  of the  Company;  and (iv)  such  other
documents and records as we have deemed  necessary and relevant for the purposes
hereof.  In addition,  we have relied on certificates of



                   [Letterhead of Crosby, Heafey, Roach & May]

Enova Systems, Inc.
June 6, 2002
Page 2


officers of the  Company  and  certificates  of public  officials  as to certain
matters of fact  relating to this opinion and have made such  investigations  of
law as we have deemed necessary and relevant as a basis hereof.

We have  assumed the  enforceability  of the terms of the  settlement  agreement
entered  into at a mandatory  conference  settlement  on November 9, 2001 before
Judge Matthew Burns of the United States District Court for the Central District
of  California.  We have also assumed the  genuineness  of all  signatures,  the
authenticity  of all  documents,  certificates  and records  submitted  to us as
originals,  the conformity to authentic  original  documents,  certificates  and
records of all such documentation submitted to us as copies and the truthfulness
of all statements of facts contained therein.

Based on the  foregoing  and  subject to the  limitations  set forth  herein and
having due regard for such legal  considerations as we deem relevant,  we are of
the  opinion  that the Shares  have been  legally  issued and are fully paid and
nonassessable shares of the Common Stock of the Company.

We  consent  to  the  filing  of  this  opinion  letter  as  Exhibit  5.1 to the
Registration  Statement  and to the  reference  to this firm  under the  caption
"Legal Matters" in the prospectus which is part of the  Registration  Statement.
In giving this consent,  we do not thereby admit that we are within the category
of persons whose  consent is required  under Section 7 of the Act, the rules and
regulations of the SEC promulgated thereunder, or Item 509 of Regulation S-K.

The foregoing opinion is based on and limited to the General  Corporation Law of
the State of California and the relevant federal laws of the United States,  and
we express no opinion with respect to the laws of any other jurisdiction.



                   [Letterhead of Crosby, Heafey, Roach & May]

Enova Systems, Inc.
June 6, 2002
Page 3

Our opinion is expressly limited to the matters set forth above and we render no
opinion,  whether by implication or otherwise,  as to any other matters relating
to the Company or the Shares.

                                                    Very truly yours,


                                                    CROSBY, HEAFEY, ROACH & MAY,
                                                    PROFESSIONAL CORPORATION