Exhibit 24.1

                               POWER OF ATTORNEY
                              (Section 16 Filings)

    Know all by these presents, that the undersigned hereby constitutes and
appoints Donald P. Klein and Oriana Pietrangelo, the undersigned's true and
lawful attorney-in-fact to:

 1. Execute for and on behalf of the undersigned, in the undersigned's capacity
    as an officer and/or director of Power Solutions International, Inc.
    ("PSI"), Forms 3, 4 and 5 in accordance with Section 16(a) of the Securities
    Exchange Act of 1934 and the rules and regulations promulgated thereunder;

 2. Do and perform any and all acts for and on behalf of the undersigned which
    may be necessary or desirable to complete and execute any such Form 3, 4 or
    5, complete and execute any amendment or amendments thereto and timely file
    such form with the United States Securities and Exchange Commission and any
    national quotation system, national securities exchange, stock exchange or
    similar authority; and

 3. Take any other action of any type whatsoever in connection with the
    foregoing which, in the opinion of such attorney-in-fact, may be of benefit
    to, in the best interest of or legally required by the undersigned, it being
    understood that the documents executed by such attorney-in-fact on behalf of
    the undersigned pursuant to this Power of Attorney shall be in such form and
    shall contain such terms and conditions as such attorney-in-fact may approve
    in such attorney-in-fact's discretion.

    The undersigned hereby grants to such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this Power of Attorney and the rights and powers herein
granted. The undersigned acknowledges that the foregoing attorney-in-fact, in
serving in such capacity at the request of the undersigned, is not assuming, nor
is PSI assuming, any of the undersigned's responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934.

    This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of and transactions in securities issued by PSI, unless
earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorney-in-fact.

    IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 12th day of March, 2021.

                                                    /s/ Constantine Xykis
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                                                 Signature

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                                                 Constantine Xykis