Document:

Offer Letter by and between Enphase Energy, Inc. and Paul B. Nahi

 Exhibit 10.5 
 January 1, 2007 
 Mr. Paul B. Nahi 

Dear Paul: 
 PVI Solutions,
Inc. (the “Company”) is pleased to offer you employment on the following terms: 
 1. Position.
Your title will be President and Chief Executive Officer, and you will report to the Company’s Board of Directors. This is a full-time position. While you render services to the Company, you will not engage in any other employment, consulting
or other business activity (whether full-time or part-time) that would create a conflict of interest with your duties to the Company. So long as you remain the Chief Executive Officer of the Company, you will be appointed to the Board of Directors
of the Company promptly (but in no event more than 30 days) following the date of this letter agreement, and thereafter recommended by the Board of Directors for reelection in connection with subsequent elections of directors. By signing this letter
agreement, you confirm to the Company that you have no contractual commitments or other legal obligations that would prohibit you from performing your duties for the Company. 
 2. Cash Compensation. The Company will pay you a starting salary at the rate of sixty thousand dollars ($60,000.00) per year, payable in accordance with the Company’s standard payroll
schedule. Your salary will be increased to one hundred and ninety thousand dollars ($190,000.00) per year upon the receipt of minimum aggregate gross proceeds to the Company of $4 Million in connection with a Series B Preferred Stock offering (the
“Financing”). Your salary, together with the other benefits provided for herein, will be subject to review by the Board of Directors of the Company annually or more often, with the first such review to occur on or before
January 1, 2008 (the “First Review”). Within 30 days following the date of this letter agreement you and the Board of Directors shall agree on a set of performance criteria (the “Performance
Criteria”) to be evaluated at the First Review. 
 3. Employee Benefits. As a regular employee of the
Company, you will be eligible to participate in regular health insurance, profit sharing, bonus, and other employee benefit plans if and as established by the Company for its employees from time to time at levels applicable to the Company’s
senior management. The Company will make an annual matching contribution on your behalf to the Company’s 401(k) Plan of three percent (3%) of your gross salary for the preceding 12-month period based on the salary amounts as set forth in
Section 2 above. The Company may change or cease to make these contributions at any time for any reason with or without notice, provided, however, to the extent the Company reduces its contributions from this three percent (3%) level, your
salary will be increased by an equivalent 

 Mr. Paul B. Nahi 
 January 1, 2007 
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amount. In addition, you will be entitled to paid vacation at levels applicable to the Company’s senior management in accordance with the Company’s vacation policy, as in effect from
time to time. 
 4. Expenses. You will be reimbursed for reasonable legitimate business expenses incurred in the
performance of your duties. 
 5. Stock Grants. Promptly following execution of this letter agreement, you will be
granted nine hundred and fifty-two thousand (952,000) shares of Common Stock of the Company (“Initial Shares”) under the Company’s 2006 Equity Incentive Plan, as amended to permit the full issuance of such shares
(the “Plan”) at a purchase price per share equal to $0.0001 per share (which amount is equal to the par value per share of such shares). All shares of Common Stock you receive or purchase from the Company under this Agreement
will be subject to repurchase at such price and will be subject to the other terms and conditions applicable to shares granted under the Plan, as described in the Plan and the applicable stock purchase agreement. Subject to your continued employment
and the terms and conditions of the Plan, twenty-five percent (25%) of the shares will vest and no longer be subject to the Company’s repurchase right on the date that is twelve (12) months following January 1, 2007, and the
balance will vest in equal monthly installments over the next thirty-six (36) months of continuous service, as described in the applicable stock purchase agreement. 
 Upon the final closing of the Financing (the “Closing”), you will be granted an additional number of shares of Common Stock that results in your holding, in addition to the Initial
Shares, a number of shares of Common Stock equal to (a) six and one-half percent (6.5%) of the number of fully-diluted shares of Common Stock then outstanding (including: all outstanding shares of Common Stock, all outstanding shares of
Preferred Stock issued through the Closing on an as-converted to Common Stock basis, the full number of shares of Common Stock issuable upon exercise of all outstanding warrants and upon conversion all Preferred Stock issuable upon exercise of all
outstanding warrants, and the full number of shares of Common Stock issuable under all other options, warrants and equity plans of the Company in effect as of the Closing, the “Fully Diluted Shares”), less (b) the
Initial Shares (such resulting number, the “Closing Shares”), at a purchase price per share equal to $0.0001 per share. 
 If the Board of Directors at the First Review determines, in the exercise of its reasonable discretion, that you have met the Performance Criteria in all material respects, you will be granted the
opportunity to purchase an additional number of shares of Common Stock that results in your holding, in addition to the Initial Shares and the Closing Shares, a number of shares of Common Stock equal to (a) seven percent (7%) of the number
of Fully Diluted Shares, less (b) the Initial Shares plus the Closing Shares, at a purchase price per share equal to the then-current fair market value per share of the Company’s Common Stock as determined in good faith by the Board.

 You will be responsible for making an election pursuant to Section 83(b) of the Internal Revenue Code with respect to
all such shares within thirty (30) days following each issuance of such shares. 

 Mr. Paul B. Nahi 
 January 1, 2007 
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 6. Severance Benefits. 

(A) In the event that the Company terminates your employment without Cause (as defined below) or you voluntarily resign from your
employment with Good Reason (as defined below): (i) the Company shall pay to you promptly (but in no event more than 5 days following such termination or resignation), a lump sum equal to (a) your base salary accrued through the date of
termination or resignation, (b) all accrued vacation pay and accrued bonuses, if any, to the date of termination or resignation, and (c) an amount equal to three (3) months of your base salary at the higher of (I) the rate in
effect on the date of notice of termination or resignation and (II) the rate in effect six months prior to the date of notice of termination or resignation, (ii) the Company shall provide, at the Company’s expense, continuation coverage to
you and your dependents under any health plan(s) of the Company adopted after the date of this letter agreement in which you participated on the date of termination or resignation, or in the event any such health plan is not continued or you are not
eligible for coverage thereunder due to your termination or resignation, the Company shall pay for the premiums for equivalent coverage, in any event, for a period of three (3) months after the date of termination or resignation, and
(iii) notwithstanding anything to the contrary contained herein or in any agreement with respect hereto; (a) twenty-five percent (25%) of each restricted equity grants, equity options and similar rights originally granted to you with
respect to securities of the Company, including twenty-five percent (25%) of the stock described in Section 5 above, shall automatically become fully vested and, to the extent of any unexercised right, shall become immediately exercisable;
and (b) if such termination or resignation occurs in connection with or following a Change of Control, upon such termination or resignation, all of such restricted equity grants, equity options and similar rights held by you with
respect to securities of the Company, including the stock grants described in Section 5 above, shall automatically become fully vested and, to the extent of any unexercised right, shall become immediately exercisable. Each unexercised right
shall remain exercisable for a period of twelve (12) months following such termination or resignation, provided that you understand that any option that is an Incentive Stock Option under Section 422 of the Internal Revenue Code will
become a nonqualified option if the option is not exercised within 90 days following such termination or resignation. 
 (B) For
purposes of this letter agreement. “Cause” means (i)you have intentionally engaged in unfair competition with the Company, intentionally induced a significant customer of the Company to breach any contract with the Company,
intentionally made an unauthorized disclosure of material confidential information of the Company or otherwise intentionally breached a contract between you and the Company (including this Agreement and the Employee Invention Assignment and
Confidentiality Agreement attached hereto as Exhibit A), committed an act of embezzlement, fraud or theft with respect to the property of the Company, or deliberately disregarded the rules of the Company, in any such event in such a manner as
to cause material loss, damage or injury to, or otherwise materially to endanger or damage the business, property, reputation or employees of, the Company, (ii) you have repeatedly abused alcohol or drugs on the job or in a manner affecting his
job performance, 

 Mr. Paul B. Nahi 
 January 1, 2007 
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or (iii) you have been found guilty of or have plead nolo contendere to the commission of a felony offense. 

(C) For purposes of this letter agreement, “Change of Control” means: (i) any “person” (as such
term is used in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended) is or becomes the “beneficial owner” (as defined in Rule 13d-3 under said Act), directly or indirectly, of securities of the Company representing
a majority of the total voting power represented by the Company’s then outstanding voting securities (except for bona fide financings of the Company); or (ii)the date of the consummation of a merger or consolidation of the Company with any
other corporation that has been approved by the stockholders of the Company, other than a merger or consolidation which would result in the voting securities of the Company outstanding immediately prior thereto continuing to represent (either by
remaining outstanding or by being converted into voting securities of the surviving entity) a majority of the total voting power represented by the voting securities of the Company or such surviving entity outstanding immediately after such merger
or consolidation, or the stockholders of the Company approve a plan of complete liquidation of the Company; or (iii) the date of the consummation of the sale or disposition by the Company of all or substantially all the Company’s assets.

 (D) For purposes of this letter agreement, “Good Reason” means: (i) without your written
consent, the assignment of you to any duties materially inconsistent with, or any adverse change in, your positions, duties, responsibilities or status as President and Chief Executive Officer of the Company, or the removal of you from, or failure
to reelect you to, any of such positions, (ii) a reduction by the Company in your base salary other than a proportionate reduction in the base salaries of all executive officers of the Company, (iii) the Company requiring you to be based
in excess of 50 miles from the Company’s present executive offices, (iv) the failure of the Company to continue in effect for you any material benefit now or hereafter made available to the Company’s senior management, or
(vi) any material breach by the Company of this letter agreement which is not cured within ten (10) days of notice thereof by you to the Company, or the material breach by the Company of this letter agreement three or more times (whether
or not the breaches are the same and whether or not the breaches are subsequently cured) in any twelve month period. 
 7.
Indemnification. As an employee, officer and agent of the Company, you shall be fully indemnified by the Company to the fullest extent permitted by California law. To implement this provision, Company shall execute and deliver to you its
standard form of indemnification agreement for officers and directors, and you shall thereafter be entitled to the benefits of any subsequent amendments thereto made for any management executives. 

8. No Termination. This letter agreement shall not be terminated by any voluntary or involuntary dissolution of the Company or by
the transfer of all or substantially all the assets of the Company or the merger of the Company with or into another entity. 

 Mr. Paul B. Nahi 
 January 1, 2007 
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 9. Confidentiality. As an employee of the Company, you will have access to
certain confidential information of the Company and you may, during the course of your employment, develop certain information or inventions that will be the property of the Company. To protect the interests of the Company, you will need to sign the
Company’s standard “Employee Invention Assignment and Confidentiality Agreement” attached hereto as Exhibit A as a condition of your employment. We wish to impress upon you that we do not want you to, and we hereby direct you
not to, bring with you any confidential or proprietary material of any former employer or to violate any other obligations you may have to any former employer. During the period that you render services to the Company, you agree to not engage in any
employment, business or activity that is in any way competitive with the business or proposed business of the Company. You will disclose to the Company in writing any other gainful employment, business or activity that you are currently associated
with or participate in that competes with the Company. You will not assist any other person or organization in competing with the Company or in preparing to engage in competition with the business or proposed business of the Company. You represent
that your signing of this offer letter, agreement(s) concerning stock granted to you, if any, under the Plan and the Company’s Employee Invention Assignment and Confidentiality Agreement and your commencement of employment with the Company will
not violate any agreement currently in place between yourself and current or past employers. 
 10. Employment
Relationship. Employment with the Company is for no specific period of time. Your employment with the Company will be “at will,” meaning that either you or the Company may terminate your employment at any time and for any reason, with
or without cause. Any contrary representations that may have been made to you are superseded by this letter agreement. This is the full and complete agreement between you and the Company on this term. Although your job duties, title, compensation
and benefits, as well as the Company’s personnel policies and procedures, may change from time to time subject to the terms of this letter agreement (including Section 6 hereof), the “at will” nature of your employment may only
be changed in an express written agreement signed by you and a duly authorized officer of the Company (other than you). 
 11.
Withholding Taxes. All forms of compensation referred to in this letter agreement are subject to reduction to reflect applicable withholding and payroll taxes and other deductions required by law. 

12. Interpretation, Amendment and Enforcement. This letter agreement and Exhibit A constitute the complete agreement
between you and the Company, contain all of the terms of your employment with the Company and supersede any prior agreements, representations or understandings (whether written, oral or implied) between you and the Company. This letter agreement may
not be amended or modified, except by an express written agreement signed by both you and a duly authorized officer of the Company. The terms of this letter agreement and the resolution of any disputes as to the meaning, effect, performance or
validity of this letter agreement or arising out of, related to, or in any way connected with, this letter agreement, your employment with the Company or any other relationship between you and the Company (the “Disputes”)
will be governed by California law, excluding laws relating to 

 Mr. Paul B. Nahi 
 January 1, 2007 
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conflicts or choice of law. You and the Company submit to the exclusive personal jurisdiction of the federal and state courts located in San Francisco and Sonoma County in connection with any
Dispute or any claim related to any Dispute. In the event of litigation under this letter agreement (including enforcing judgments and appeals), the prevailing party shall be entitled to reimbursement of its reasonable attorneys’ fees and costs
of suit in addition to such other relief as may be granted. 
 * * * * * 

 Mr. Paul B. Nahi 
 January 1, 2007 
  Page
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 We hope that you will accept our offer to join the Company on the terms of this letter.
You may indicate your agreement with these terms and accept this offer by signing and dating both the enclosed duplicate original of this letter agreement and the enclosed Proprietary Information and Inventions Agreement and returning them to me.
This offer, if not accepted, will expire at the close of business on January 24, 2007. As required by law, your employment with the Company is contingent upon your providing legal proof of your identity and authorization to work in the United
States. 
  

			
	Very truly yours,
	
	PVI SOLUTIONS, INC.
		
	By:	 	 /s/ Raghuveer R. Belur

		 	Raghuveer R. Belur
		
	Title:	 	 Member of the Board

 I have read and accept this employment offer: 
  

			
	 /s/ Paul Nahi

	Signature of Paul Nahi
		
	 Dated:
	 	 1/1/07

 ENPHASE ENERGY, INC. 

AMENDMENT NO. 1 TO LETTER AGREEMENT 
 This Amendment No. 1 (this “Amendment”) to the Letter Agreement dated as of January 1, 2007 (the “Agreement”) between Enphase Energy, Inc., formerly know as PVI
Solutions, Inc. a Delaware corporation with its principal offices located at 201 1st Street, Suite 111, Petaluma, California 94952 (the “Company”), and Paul B. Nahi, a resident of California (the “Employee”) is entered into as of December 21, 2008.

 WHEREAS, the Company and the Employee have agreed to amend the Agreement to clarify certain existing provisions in light of
final regulations issued under Section 409A of the Internal Revenue Code of 1986, as amended. 
 NOW, THEREFORE, the
parties agree as follows: 
 1. Section 4 of the Agreement is hereby amended and restated as follows: 

“4. Expenses. You will be reimbursed for reasonable legitimate business expenses incurred in the performance
of your duties, provided that such expenses are in accordance with applicable policy set by the Board from time to time and are properly documented and accounted for in accordance with the policy of the Company and with the requirements of the
Internal Revenue Service. To the extent that any expense reimbursements are subject to the provisions of Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”), such reimbursements will be paid no
later than December 31 of the year following the year in which the reimbursable expenses are incurred, the amount of expenses reimbursed in one year will not affect the amount eligible for reimbursement in any subsequent year, and the right to
reimbursement will not be subject to liquidation or exchange for another benefit.” 
 2. Section 6(A) of the Agreement
is hereby amended and restated as follows: 
 “(A) In the event that the Company terminates your employment
without Cause (as defined below) or you voluntarily resign from your employment with Good Reason (as defined below) and such termination or resignation constitutes a “separation from service” (as defined in Section 409A of the Code):
(i) the Company shall pay to you promptly (but in no event more than five (5) days following such termination or resignation), a lump sum equal to (a) your base salary accrued through the date of termination or resignation,
(b) all accrued vacation pay and accrued bonuses, if any, to the date of termination or resignation, and (c) an amount equal to three (3) months of your base salary at the higher of (I) the rate in effect on the date of notice of
termination or resignation and (II) the rate in effect six months prior to the date of notice of termination or resignation, (ii) the Company shall provide, at the Company’s expense, continuation of coverage to you and your dependents
under any health plan(s) of the Company adopted after the date of this letter agreement in which you participated on the date of termination or resignation, subject to your timely election of COBRA coverage,

 
or in the event any such health plan is not continued or you are not eligible for coverage thereunder due to your termination or resignation, the Company shall pay for the premiums for equivalent
coverage, in any event, for a period of three (3) months after the date of termination or resignation, and (in) notwithstanding anything to the contrary contained herein or in any agreement with respect hereto: (a) twenty-five percent
(25%) of each restricted equity grant, equity option and similar right originally granted to you with respect to securities of the Company, including twenty-five percent (25%) of the stock described in Section 5 above, shall
automatically become fully vested and, to the extent of any unexercised right, shall become immediately exercisable; and (b) if such termination or resignation occurs in connection with or following a Change of Control, upon such termination or
resignation, all of such restricted equity grants, equity options and similar rights held by you with respect to securities of the Company, including the stock grants described in Section 5 above, shall automatically become fully
vested and, to the extent of any unexercised right, shall become immediately exercisable. Each unexercised right shall remain exercisable for a period of twelve (12) months following such termination or resignation, provided that you understand
that any option that is an Incentive Stock Option under Section 422 of the Internal Revenue Code will become a nonqualified option if the option is not exercised within 90 days following such termination or resignation.” 

3. Section 6(D) of the Agreement is hereby amended and restated as follows: 

“(D) For purposes of this letter agreement, “Good Reason” means: (i) without your written consent, the
assignment of you to any duties materially less than, or any material adverse change in, your duties, responsibilities or authority as President and Chief Executive Officer of the Company, or the removal of you from, or failure to reelect you to,
any of such positions, (ii) a material reduction by the Company in your base salary other than a proportionate reduction in the base salaries of all executive officers of the Company, (iii) the Company’s requiring you to be based in
excess of 50 miles from the Company’s present executive offices, or (iii) any material breach by the Company of this letter agreement, which shall include a material reduction in the type or level of benefits set forth in Section 3;
provided that Good Reason shall not exist unless you provide notice of any condition described in (i)-(vi) above within ninety (90) days of the initial existence of the condition, the Company is provided with a period of thirty
(30) days from the date of receipt of such notice to cure the circumstances giving rise to Good Reason and the effective date of your termination following the Company’s failure to cure the circumstances giving rise to Good Reason is not
later than thirty (30) days following the expiration of the thirty (30) day cure period.” 
 4. A new
Section 13 of the Agreement is hereby added as follows: 
 “13. Compliance with
Section 409A. All severance payments to be made upon a termination of employment under this letter agreement may be made only upon a “separation of service” within the meaning of Section 409A of the Code and the
Department of Treasury regulations and other guidance promulgated thereunder. Notwithstanding any provision to the contrary in this letter agreement, if you are deemed 

 
by the Company at the time of your separation from service to be a “specified employee” for purposes of Code Section 409A(a)(2)(B)(i), to the extent delayed commencement of any
portion of the benefits to which you are entitled under this letter agreement is required in order to avoid a prohibited distribution under Code Section 409A(a)(2)(B)(i), such portion of your benefits shall not be provided to you prior to the
earlier of (i) the expiration of the six-month period measured from the date of your “separation from service” with the Company or (ii) the date of your death. Upon the first business day following the expiration of the
applicable Code Section 409A(a)(2)(B)(i) period, all payments deferred pursuant to this Section 13 shall be paid in a lump sum to you, and any remaining payments due under this letter agreement shall be paid as otherwise provided herein.
For purposes of Code Section 409A (including, without limitation, for purposes of Treasury Regulation Section 1.409A-2(b)(2)(iii)), your right to receive installment payments under this letter agreement shall be treated as a right to
receive a series of separate payments and, accordingly, each installment payment hereunder shall at all times be considered a separate and distinct payment. It is intended that all of the severance payments satisfy, to the greatest extent possible,
the exemptions from the application of Code Section 409A provided under of Treasury Regulation 1.409A-1(b)(4), 1.409A-1(b)(5) and 1.409A-1 (b)(9), and this letter agreement will be construed to the greatest extent possible as consistent with
those provisions.” 
 5. Capitalized terms not defined herein have the meanings set forth in the Agreement. Except as set
forth herein, the Agreement, as amended hereby, remains in full force and effect. 
 [Signature Page Follows] 

 IN WITNESS WHEREOF, the Company and Employee have executed this Amendment as of the date
first above written. 
  

									
	“COMPANY”	 		 	“EMPLOYEE”
			
	ENPHASE ENERGY, INC.	 		 	PAUL B. NAHI
					
	By:	 	 /s/ Paul Nahi /s/ Jude Radeski
	 		 	By:	 	 /s/ Paul Nahi

					
	Name:	 	 Paul Nahi / Jude Radeski
	 		 		 	
					
	Title:	 	 CEO / CONTROLLEROffer Letter by and between Enphase Energy, Inc. and Sanjeev Kumar

 Exhibit 10.6 

 

 

 November 12, 2009 
 Sanjeev Kumar 
 Dear Sanjeev: 

Enphase Energy, Inc. (the “Company”) is pleased to offer you employment on the following terms: 

1. Position. Your title will be Chief Financial Officer, and you will report to Paul Nahi, President and CEO. This is a full-time position. While
you render services to the Company, you will not engage in any other employment, consulting or other business activity (whether full-time or part-time) that would create a conflict of interest with your duties to the Company. By signing this letter
agreement, you confirm to the Company that you have no contractual commitments or other legal obligations that would prohibit you from performing your duties for the Company. 
 In connection with your joining the Company, our mutual understanding and agreement is that you will relocate to Northern California by July 2010. 
 2. Cash Compensation. The Company will pay you a starting salary at the rate of Two Hundred Twenty-Five Thousand Dollars ($225,000) per year, payable in accordance with the Company’s standard
payroll schedule. Your salary will be subject to adjustment pursuant to the Company’s employee compensation policies in effect from time to time. In addition, during your first twelve months of employment, and subject to your continued
employment with the Company, you will be eligible to receive a cash bonus of up to Fifty Thousand Dollars ($50,000) (the “First Year Bonus”), based upon completion of objectives to be mutually agreed upon by you and the
Company’s Chief Executive Officer (the “First Year MBO’s”). Bonuses in future periods, subject to your continued employment with the Company, are to be mutually agreed upon by you and the Company’s Chief
Executive Officer. Bonus payment(s) will be paid to you within 60 days following the date that the Company determines that the applicable bonus has been earned. In addition to your salary and bonus, you will be eligible for a reimbursement of up to
Fifty-Five Thousand Dollars: ($55,000) in qualified 

  

 

 

  
 
relocation expenses (including temporary travel and living expenses) in accordance with the Company’s expense reimbursement policies. 

3. Potential Loan. At your request, the Company will advance to you as a loan the full amount of the First Year Bonus after completion of your
first six months of employment, if the Company determines that you are making reasonable progress toward achieving the First Year MBO’s. Such loan will bear interest at the minimum applicable federal rate (AFR) prescribed by the IRS, and will
be due and payable on the earlier of March 31, 2011 or the date on which your employment terminates for any reason (the “Payment Date”) provided that if the Company determines that the First Year MBO’s have been
fully or partially achieved by the Payment Date, the Company will forgive such loan (including accrued interest) in full or in part (to the extent the First Year MBO’s have been achieved) as of the determination date. You will be responsible
for all state and federal income and employment taxes associated with the loan and any forgiveness. Notwithstanding the foregoing, in order to comply with Sarbanes-Oxley rules, such loan must be repaid in full (if not forgiven) prior to the initial
filing of a registration statement for an initial public offering of the Company’s common stock (an “IPO”). 
 4.
Employee Benefits. As a regular employee of the Company, you will be eligible to participate in regular health insurance, profit sharing, bonus, and other employee benefit plans if and as established by the Company for its employees from time
to time. In addition to your gross salary, the Company will make an annual contribution on your behalf to the Company’s 401(k) Plan of three percent (3%) of your “compensation”, as set forth in the Company’s 401(k) Plan, for
the preceding 12-month period, subject to the provisions of the Company’s 401(k) Plan. The Company may change or cease to make these contributions in future calendar years by providing notice in advance of the beginning of the next plan year.
In addition, you will be entitled to paid vacation in accordance with the Company’s vacation policy, as in effect from time to time. 
 5.
Expenses. You will be reimbursed for reasonable legitimate business expenses incurred in the performance of your duties in accordance with the Company’s expense reimbursement policies, as in effect from time to time. 

6. Stock Option Grant. Following execution of this letter agreement, we will recommend to the Board of Directors of the Company that you be
granted a stock option to purchase up to Two Million Fifty-Eight 

  

 

 

  
 
Thousand (2,058,000) shares of Common Stock of the Company under the Company’s 2006 Equity Incentive Plan (the “Plan”). The exercise price per share will be
equal to the fair market value per share on the date the Board approves such grant or on your first day of employment, whichever is later. The stock option will be subject to the terms and conditions applicable to options granted under the Plan, as
described in and subject to the Plan and the applicable stock option agreement. Subject to your continued employment and the terms and conditions of the Plan and applicable agreement, twenty-five percent (25%) of the shares will vest and become
exercisable twelve (12) months following your first date of employment, and the balance will vest and become exercisable in equal monthly installments over the next thirty-six (36) months of continuous service, as described in the
applicable stock option agreement. 
 With respect to the foregoing, the grant of the opportunity to purchase such shares by the Company is
subject to the Board’s approval and this promise to recommend such approval is not a promise of compensation and is not intended to create any obligation on the part of the Company. 
 7. Benefits Upon Termination of Employment Following a Change of Control. In the event of a Change of Control and, following such Change of Control, your employment is terminated by the
surviving entity as a result of an involuntary termination other than for Cause or if you resign for Good Reason from the surviving entity in each case at any time within 24 months of your first date of employment with the Company, then you will be
entitled to receive severance benefits as follows: (i) severance payments during the period from the date of your termination until the end of the Severance Period (as defined below) equal to the base salary which you were receiving immediately
prior to the Change of Control, which payments shall be paid during the Severance Period in accordance with the surviving entity’s standard payroll practices, (ii) continuation of the health insurance benefits provided to you for you and
your eligible dependents immediately prior to the Change of Control at Company expense pursuant to the terms of the Consolidated Omnibus Budget Reconciliation Act of 1985, as amended (“COBRA”) or other applicable law through
the earlier of the end of the Severance Period or the date upon which you are no longer eligible for such COBRA or other benefits under applicable law, and (iii) your initial stock option grant referenced in Section 6 shall become
immediately vested as to 50% of the total number of shares (including shares previously vested). No benefits under this Section 7 will apply after 24 months of your first date of employment with the Company, and the foregoing option 

  

 

 

  
 vesting arrangement will only apply to your
initial option grant, unless otherwise approved by the Board. 
 8. Definition of Terms. The following terms referred to in this letter
agreement shall have the following meanings: 
 (a) Change of Control. “Change of Control” shall
mean a sale of all or substantially all of the Company’s assets, or any merger or consolidation of the Company with or into another corporation other than a merger or consolidation in which the holders of more than 50% of the shares of capital
stock of the Company outstanding immediately prior to such transaction continue to hold (either by voting securities remaining outstanding or by their being converted into voting securities of the surviving entity) more than 50% of the total voting
power represented by the voting securities of the Company, or such surviving entity, outstanding immediately after such transaction. For purposes of clarification, neither an equity financing occurring prior to an IPO nor an IPO will be a Change of
Control, even if equity securities representing greater than 50% of the total voting power of the Company are sold in the transaction. 
 (b) Cause. “Cause” shall mean, as determined by the Board of Directors of the Company acting in good faith and based on information then known to it: (A) gross
negligence or willful misconduct in the performance of duties to the Company where such gross negligence or willful misconduct has resulted or is likely to result in substantial and material damage to the Company or its subsidiaries; (B) a
material failure to comply with the Company’s written policies after having received from the Company notice of, and a reasonable time to cure, such failure; (C) repeated unexplained or unjustified absence from the Company;
(D) conviction of a felony or a crime involving moral turpitude causing material harm to the standing and reputation of the Company; (E) unauthorized use or disclosure of any proprietary information or trade secrets of the Company or any
other party to whom you owe an obligation of non-disclosure as a result of your relationship with the Company, which use or disclosure causes or is likely to cause material harm to the Company; or (F) your death or Permanent Disability.

 (c) Good Reason. “Good Reason” for your resignation of your employment will exist following
the occurrence of any of the following without your consent: (A) a material reduction or change in job duties, responsibilities or authority inconsistent with your position with the Company and

  

 

 

  
 
your prior duties, responsibilities or authority; (B) a reduction of your then current base salary by more than 10 percent (10%) or (C) a relocation of the principal place for
performance of your duties to the Company to a location more than twenty-five (25) miles from the Company’s then current location; provided that you give written notice to the Company of the event forming the basis of the Good Reason
resignation within sixty (60) days of the date the Company gives written notice to you of its affirmative decision to take an action set forth in (A), (B) or (C) above, the Company fails to cure such basis for the Good Reason
resignation within thirty (30) days after receipt of your written notice and you terminate employment within one hundred twenty (120) days following the date on which you received notice from the Company of the event forming the basis for
the Good Reason resignation. 
 (d) Permanent Disability. “Permanent Disability” shall mean your
inability to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment which can be expected to result in death or which has lasted or can be expected to last for a continuous period of not less
than six (6) months. 
 (e) Severance Period. “Severance Period” shall mean (A) nine
months in the event your employment termination occurs within eighteen months of your employment start date and (B) six months in the event your employment termination occurs after eighteen months, but within two years, of your employment start
date. 
 9. Parachute Payments. In the event that the acceleration and severance benefits provided for in this Agreement
(A) constitute “parachute payments” within the meaning of Section 280G of the Internal Revenue Code of 1986, as amended (the “Code”) and (B) but for this paragraph, would be subject to the excise tax imposed
by Section 4999 of the Code, then your benefits hereunder shall be payable either: (X) in full, or (Y) as to such lesser amount which would result in no portion of such severance benefits being subject to excise tax under
Section 4999 of the Code, whichever of the foregoing amounts, taking into account the applicable federal, state and local income taxes and the excise tax imposed by Section 4999, results in the receipt by you on an after-tax basis, of the
greatest amount of benefits hereunder, notwithstanding that all or some portion of such benefits may be taxable under Section 4999 of the Code. Unless the Company and you otherwise agree in writing, any determination required under this
paragraph shall be made in writing by the public accountants 

  

 

 

  
 
designated by the Company (the “Accountants”), whose determination shall be conclusive and binding upon you and the Company for all purposes. For purposes of making the
calculations required by this paragraph, the Accountants may make reasonable assumptions and approximations concerning applicable taxes and may rely on reasonable, good faith interpretations concerning the application of Section 280G and 4999
of the Code. The Company and you shall furnish to the Accountants such information and documents as the Accountants may reasonably request in order to make a determination under this paragraph. The Company shall bear all costs the Accountants may
reasonably incur in connection with any calculations contemplated by this paragraph. In the event that a reduction in payments and/or benefits is required under this paragraph, such reduction shall occur in the following order: (1) reduction of
cash payments; (2) reduction of acceleration of vesting of options and shares; and (3) reduction of other benefits paid to you. If the acceleration of vesting of options and shares is to be reduced, such acceleration of vesting shall be
cancelled in the reverse order of the highest price option grant or highest purchase price per share down to the lowest priced option grant or lowest purchase price per share. 
 10. Limitations and Conditions on Benefits. 
 (a) Income and
Employment Taxes. You agree that you shall be responsible for any applicable taxes of any nature (including any penalties or interest that may apply to such taxes) that the Company reasonably determines apply to any payment made hereunder,
that your receipt of any benefit hereunder is conditioned on your satisfaction of any applicable withholding or similar obligations that apply to such benefit, and that any cash payment owed hereunder will be reduced to satisfy any such withholding
or similar obligations that may apply. 
 (b) Code Section 4Q9A. All payments to be made upon a termination
of employment under this Agreement may be made only upon a “separation of service” within the meaning of Section 409A of the Code and the Department of Treasury regulations and other guidance promulgated thereunder (a
“Separation from Service”). Notwithstanding any provision of this Agreement to the contrary, if, at the time of your termination of employment with the Company, you are a “specified employee” (as defined in
Section 409A of the Code) and the deferral of the commencement of any severance payments or benefits otherwise payable pursuant to this Agreement as a result of such termination of employment is necessary in order to prevent any accelerated or

  

 

 

  
 
additional tax under Section 409A of the Code, then the Company will defer the commencement of the payment of any such severance payments or benefits hereunder (without any reduction in such
payments or benefits ultimately paid or provided to you) that will not and could not under any circumstances, regardless of when such termination occurs, be paid in full by March 15 of the year following your termination and are in excess of
the lesser of (i) two (2) times your then annual compensation or (ii) two (2) times the limit on compensation then set forth in Section 401(a)(17) of the Code and will not be paid by the end of the second calendar year
following the year in which the termination occurs, until the first payroll date that occurs after the date that is six (6) months following your “separation of service” with the Company (as defined under Code Section 409A). If
any payments are deferred due to such requirements, such amounts will be paid in a lump sum to you on the earliest of (a) your death following the date of your termination of employment with the Company or (ii) the first payroll date that
occurs after the date that is six (6) months following your “separation of service” with the Company. For these purposes, each severance payment or benefit is hereby designated as a separate payment or benefit and will not
collectively be treated as a single payment or benefit. This paragraph is intended to comply with the requirements of Section 409A of the Code so that none of the severance payments and benefits to be provided hereunder will be subject to the
additional tax imposed under Section 409A of the Code and any ambiguities herein will be interpreted to so comply. You and the Company agree to work together in good faith to consider amendments to this Agreement and to take such reasonable
actions which are necessary, appropriate or desirable to avoid imposition of any additional tax or income recognition prior to actual payment to you under Section 409A of the Code. 

(c) Release Prior to Receipt of Benefits. As a condition of receiving the benefits under this Agreement, you shall execute,
and allow to become effective, a release of claims agreement (the “Release”) not later than fifty (50) days following your Separation from Service in the form provided by the Company. Such Release shall specifically relate to
all of your rights and claims in existence at the time of such execution and shall confirm your obligations under the Company’s standard Employee Invention Assignment and Confidentiality Agreement. Unless the Release is timely executed by you,
delivered to the Company, and becomes effective within the required period (the date on which the Release becomes effective, the “Release Date”), you will not receive any of the benefits provided for under this Agreement. In no
event will benefits be provided to you until the Release becomes effective. Any lump sum 

  

 

 

  
 
payment owed to you shall be paid within ten (10) business days following the Release Date, but in no event later than March 15 of the year following the year in which the applicable
event occurs. 
 11. Confidentiality. As an employee of the Company, you will have access to certain confidential information of the
Company and you may, during the course of your employment, develop certain information or inventions that will be the property of the Company. To protect the interests of the Company, you will need to sign the Company’s standard “Employee
Invention Assignment and Confidentiality Agreement” attached hereto as Exhibit A as a condition of your employment. We wish to impress upon you that we do not want you to, and we hereby direct you not to, bring with you any confidential
or proprietary material of any former employer or to violate any other obligations you may have to any former employer. During the period that you render services to the Company, you agree to not engage in any employment, business or activity that
is in any way competitive with the business or proposed business of the Company. You will disclose to the Company in writing any other gainful employment, business or activity that you are currently associated with or participate in that competes
with the Company. You will not assist any other person or organization in competing with the Company or in preparing to engage in competition with the business or proposed business of the Company. You represent that your signing of this offer
letter, agreement(s) concerning stock options granted to you, if any, under the Plan and the Company’s Employee Invention Assignment and Confidentiality Agreement and your commencement of employment with the Company will not violate any
agreement currently in place between yourself and current or past employers. 
 12. Employment Relationship. Employment with the Company
is for no specific period of time. Your employment with the Company will be “at will,” meaning that either you or the Company may terminate your employment at any time and for any reason, with or without cause. Any contrary representations
that may have been made to you are superseded by this letter agreement. This is the full and complete agreement between you and the Company on this term. Although your job duties, title, compensation and benefits, as well as the Company’s
personnel policies and procedures, may change from time to time, the “at will” nature of your employment may only be changed in an express written agreement signed by you and a duly authorized officer of the Company (other than you).

  

 

 

  
 
13. Withholding Taxes. All forms of compensation referred to in this letter agreement are subject to reduction to reflect applicable withholding and payroll taxes and other deductions
required by law. 
 14. Interpretation, Amendment and Enforcement. This letter agreement and Exhibit A constitute the complete
agreement between you and the Company, contain all of the terms of your employment with the Company and supersede any prior agreements, representations or understandings (whether written, oral or implied) between you and the Company. This letter
agreement may not be amended or modified, except by an express written agreement signed by both you and a duly authorized officer of the Company. The terms of this letter agreement and the resolution of any disputes as to the meaning, effect,
performance or validity of this letter agreement or arising out of, related to, or in any way connected with, this letter agreement, your employment with the Company or any other relationship between you and the Company (the
“Disputes”) will be governed by California law, excluding laws relating to conflicts or choice of law. You and the Company submit to the exclusive personal jurisdiction of the federal and state courts located in San Francisco
and Sonoma County in connection with any Dispute or any claim related to any Dispute. 
 * * * * * 

  

 

 

  
 We hope that you will accept our offer to join
the Company on the terms of this letter. You may indicate your agreement with these terms and accept this offer by signing and dating both the enclosed duplicate original of this letter agreement and the enclosed Proprietary Information and
Inventions Agreement and returning them to me. This offer, if not accepted, will expire at the close of business on November 13, 2009. As required by law, your employment with the Company is contingent upon your providing legal proof of your
identity and authorization to work in the United States. Your employment is also contingent upon your starting work with the Company on or before December 1, 2009. 

 

			
	Very truly yours,
	
	ENPHASE ENERGY, INC.
		
	By:	 	 /s/ Paul Nahi

		 	Paul Nahi
	Title:	 	President and CEO

 I have read and accept this
employment offer: 
  

	
	 /s/ Sanjeev Kumar

	Signature of Sanjeev Kumar

  

			
	Dated:	 	 11/13/09

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