SOEN Solar Enertech Corp (CE)

CUSIP No. 834156101


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

 SCHEDULE 13D

 (AMENDMENT NO. 6)

 UNDER THE SECURITIES EXCHANGE ACT OF 1934

 SOLAR ENERTECH CORP.
 (NAME OF ISSUER)

 COMMON STOCK, $0.001 PAR VALUE
 (TITLE OF CLASS OF SECURITIES)

 834156101
 (CUSIP NUMBER)

 Joseph P. Bartlett
 The Law Offices of Joseph P. Bartlett, A Professional Corporation
 17050 SUNSET BLVD., # D
 PACIFIC PALISADES, CA 90272
 (310) 584-1234

 (Name, Address and Telephone Number of Person Authorized to Receive Notices
 and Communications)

 December 22, 2009
 (Date of Event which Requires Filing of this Statement)

If the reporting person has previously filed a statement on Schedule 13G to
report the acquisition that is the subject of this Schedule 13D, and is filing
this schedule because of Sections 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g),
check the following box / /.

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Section 240.13d-7(b) for
other parties to whom copies are to be sent.

* 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
disclosures provided in a prior cover page.

The information required on 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. 834156101


(1) Name of Reporting Person
 S.S. or I.R.S. Identification No. of Above Person

 David Gelbaum, Trustee, The Quercus Trust

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
 (A) /X/
 (B) /_/

(3) SEC Use Only

(4) Source of Funds (See Instructions)

 PF

(5) Check if Disclosure of Legal Proceedings is Required Pursuant to Items
 2(d) or 2(e)
 /_/

(6) Citizenship or Place of Organization

 U.S.

 (7) Sole Voting Power
 -0-

Number of Shares (8) Shared Voting Power
Beneficially Owned 24,585,211 (1)
by Each Reporting
Person With (9) Sole Dispositive Power
 -0-

 (10) Shared Dispositive Power
 24,585,211 (1)

(11) Aggregate Amount Beneficially Owned by Each Reporting Person
 24,585,211 (1)

(12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares
 (See Instructions)
 /_/

(13) Percent of Class Represented by Amount in Row (11)
 21.3% (1)

(14) Type of Reporting Person (See Instructions)
 IN

-------------------------
(1) Calculated in accordance with Rule 13D. See Item 5(a) for a more detailed
explanation.

CUSIP No. 834156101


(1) Name of Reporting Person
 S.S. or I.R.S. Identification No. of Above Person

 Monica Chavez Gelbaum, Trustee, The Quercus Trust

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
 (A) /X/
 (B) /_/

(3) SEC Use Only

(4) Source of Funds (See Instructions)

 PF

(5) Check if Disclosure of Legal Proceedings is Required Pursuant to Items
 2(d) or 2(e)
 /_/

(6) Citizenship or Place of Organization

 U.S.

 (7) Sole Voting Power
 -0-

Number of Shares (8) Shared Voting Power
Beneficially Owned 24,585,211 (1)
by Each Reporting
Person With (9) Sole Dispositive Power
 -0-

 (10) Shared Dispositive Power
 24,585,211 (1)

(11) Aggregate Amount Beneficially Owned by Each Reporting Person
 24,585,211 (1)

(12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares
 (See Instructions)
 /_/

(13) Percent of Class Represented by Amount in Row (11)
 21.3% (1)

(14) Type of Reporting Person (See Instructions)
 IN

-------------------------
(1) Calculated in accordance with Rule 13D. See Item 5(a) for a more detailed
explanation.

CUSIP No. 834156101


(1) Name of Reporting Person
 S.S. or I.R.S. Identification No. of Above Person

 The Quercus Trust

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
 (A) /X/
 (B) /_/

(3) SEC Use Only

(4) Source of Funds (See Instructions)

 PF

(5) Check if Disclosure of Legal Proceedings is Required Pursuant to Items
 2(d) or 2(e)
 /_/

(6) Citizenship or Place of Organization

 U.S.

 (7) Sole Voting Power
 -0-

Number of Shares (8) Shared Voting Power
Beneficially Owned 24,585,211 (1)
by Each Reporting
Person With (9) Sole Dispositive Power
 -0-

 (10) Shared Dispositive Power
 24,585,211 (1)

(11) Aggregate Amount Beneficially Owned by Each Reporting Person
 24,585,211 (1)

(12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares
 (See Instructions)
 /_/

(13) Percent of Class Represented by Amount in Row (11)
 21.3% (1)

(14) Type of Reporting Person (See Instructions)
 OO

-------------------------
(1) Calculated in accordance with Rule 13D. See Item 5(a) for a more detailed
explanation.

CUSIP No. 834156101


Item 1.

 This Amendment No. 6 to Schedule 13D (this "Amendment No. 6") amends
and restates, where indicated, the statement on Schedule 13D relating to the
Common Stock of the Issuer filed by The Quercus Trust, David Gelbaum and Monica
Chavez Gelbaum (the "Reporting Persons") with the Securities and Exchange
Commission on January 28, 2008 (the "Initial Schedule 13D") and prior amendments
thereto (the "Prior Schedules"). Capitalized terms used in this Amendment No. 6
but not otherwise defined herein have the meanings given to them in the Prior
Schedules. Except as otherwise set forth herein, this Amendment No. 6 does not
modify any of the information previously reported by the Reporting Persons in
the Prior Schedules.

Item 4. Purpose of Transaction

 (i) This Amendment No. 6 is being made to disclose further discussions
with Issuer regarding the modification of the terms of the outstanding Series A
Notes and Series B Notes and Series A, Series B and Series C Warrants of the
Issuer..

 The Reporting Persons have not determined but reserve the right to
exercise and/or convert their equity securities of the Issuer, purchase
additional shares of Common Stock in the open market or in private transactions,
or take other actions to increase the Reporting Persons' economic stake and
voting influence over the Issuer. The Reporting Persons may also from time to
time determine to sell Common Stock and other securities in the open market or
in private transactions.

 The Reporting Persons expressly retain their rights to further modify
their plans with respect to the transactions described in this Amendment No. 6
or Prior Schedules and, depending upon their further investigation of the Issuer
and market conditions, to formulate different plans and proposals which could
result in the occurrence of any other actions specified in clauses (a) through
(j) of Item 4 of Schedule 13D, subject to applicable laws and regulations.

Item 5. Interest in Securities of the Issuer

 (a) The Reporting Persons hereby disclose their ownership of the Issuer
as follows:

 (i) 22,604,936 shares of Common Stock;

 (ii) Currently exercisable Warrant to purchase up to 507,247
shares of Common Stock at an exercise price of $0.69 per share;

 (iii) Currently exercisable Warrant to purchase up to 405,264
shares of Common Stock at an exercise price of $0.57 per share;

 (iv) Currently exercisable Warrant to purchase up to 1,105,264
shares of Common Stock at an exercise price of $0.57 per share (in accordance
with Rule 13D, the Reporting Persons are deemed beneficial owners of the
securities set forth in subsections (i) through (iv) hereof, accounting for
24,585,211 shares of Common Stock and 21.3% of the total outstanding shares of
Common Stock as reported by the Issuer on its Form 10-Q filed with the SEC on
5/15/09);

 (v) Series A Note in the aggregate principal amount of
$2,397,700 with a conversion price of $0.69 per share and maturity date of
3/7/2010;

 (vi) Series B Note in the aggregate principal amount of
$6,538,154 with a conversion price of $0.57 per share and maturity date of
3/7/2010;

CUSIP No. 834156101

 (vii) Series A Warrants to purchase up to 4,347,826 shares of
Common Stock at an exercise price of $1.21 per share;

 (viii) Series B Warrants to purchase up to 13,090,261 shares
of Common Stock at an exercise price of $0.90 per share; and

 (ix) Series C Warrants to purchase up to 23,151,136 shares of
Common Stock at an exercise price of $1.00 per share; (securities of the
Reporting Persons set forth in subsections (v) through (ix) hereof,
collectively, the "Limited Derivatives").

 As of the date of this Amendment No. 6, the Reporting Persons
are prohibited from converting or exercising the Limited Derivatives to the
extent that after giving effect to such conversion or exercise, the Reporting
Persons would beneficially own in excess of 9.99% (with respect to Series A and
B Warrants and Series A and B Notes) and 19.99% (with respect to Series C
Warrants) of the total shares of Common Stock outstanding immediately after
giving effect to such conversion or exercise. Consequently, in accordance with
Rule 13D, the Reporting Persons as of the date hereof do not beneficially own
the shares of Common Stock underlying the Limited Derivatives.

 (b) The Reporting Persons have shared voting and dispositive power with
respect to the securities of the Issuer described in Item 5(a) above. Each of
David Gelbaum and Monica Chavez Gelbaum, acting alone, has the power to exercise
voting and investment control over the shares of Common Stock owned by the
Trust.

 (c) There has been no change in the beneficial ownership of the
Reporting Persons during the past sixty (60) days.

 (d) Not applicable.

 (e) Not applicable.

Item 6. Contracts, Arrangements, Understandings or Relationships With
 Respect to Securities of the Issuer

 (a) Pursuant to the Power of Attorney filed as Exhibit "B" to Amendment
No. 1 to Schedule 13D filed on August 24, 2007 with respect to the issuer Emcore
Corp., David Gelbaum has been appointed as Monica Chavez Gelbaum's
Attorney-In-Fact.

 (b) Revised Summary of Terms for Proposed Modification of Securities
dated December 21, 2009

Item 7. Material to Be Filed as Exhibits

 Exhibit A: Agreement Regarding Joint Filing of Amendment No. 6 to
 Schedule 13D.

CUSIP No. 834156101



SIGNATURE

 After reasonable inquiry and to the best of its knowledge and belief,
each of the undersigned certifies that the information set forth in this
statement is true, complete and correct and agrees that this statement may be
filed jointly with the other undersigned parties.



Dated: December 31, 2009 /s/ David Gelbaum
 -----------------------------------------------
 David Gelbaum, Co-Trustee of The Quercus Trust



 /s/ David Gelbaum, As Attorney-in-fact for
 Monica Chavez Gelbaum
 -----------------------------------------------
 Monica Chavez Gelbaum, Co-Trustee of The
 Quercus Trust


 /s/ David Gelbaum
 -----------------------------------------------
 The Quercus Trust, David Gelbaum, Co-Trustee
 of The Quercus Trust

CUSIP No. 834156101



 EXHIBIT A

 AGREEMENT REGARDING JOINT FILING OF AMENDMENT NO. 6 TO SCHEDULE 13D



 The undersigned agree that the Amendment No. 6 to Schedule 13D with
respect to the Common Stock of Solar EnerTech Corp. is a joint filing being made
on their behalf.



Dated: December 31, 2009 /s/ David Gelbaum
 -----------------------------------------------
 David Gelbaum, Co-Trustee of The Quercus Trust



 /s/ David Gelbaum, As Attorney-in-fact for
 Monica Chavez Gelbaum
 -----------------------------------------------
 Monica Chavez Gelbaum, Co-Trustee of The
 Quercus Trust


 /s/ David Gelbaum
 -----------------------------------------------
 The Quercus Trust, David Gelbaum, Co-Trustee
 of The Quercus Trust