Exhibit 5.1

TROUTMAN SANDERS LLP Attorneys at Law 5 Park Plaza Suite 1400 Irvine, California 92614 949.622.2700 telephone troutmansanders.com

November 18, 2016

Polar Power, Inc.
249 E. Gardena Blvd.

Gardena, CA 90248

Ladies and Gentlemen:

This opinion is furnished to you in connection with the Registration Statement on Form S-1 (Registration No. 333-213572), as amended (the “Registration Statement”), filed by Polar Power, Inc. (the “Company”) with the Securities and Exchange Commission in connection with the registration under the Securities Act of 1933, as amended, of (i) 2,300,000 shares (the “Shares”) of the Company’s common stock (including up to 300,000 Shares issuable upon exercise of an option granted to the underwriters by the Company) and (ii) a warrant to purchase up to 115,000 shares of the Company’s common stock issued to the representatives of the underwriters (the “Representatives’ Warrant,” and the shares of the Company’s common stock underlying the Representatives’ Warrant, the “Representatives’ Warrant Shares”). The Shares, the Representatives’ Warrant, and the Representatives’ Warrant Shares shall be referred to herein collectively as the “Securities.” We understand that the Shares are to be sold to the underwriters for resale to the public as described in the Registration Statement and pursuant to an underwriting agreement, substantially in the form filed as an exhibit to the Registration Statement, to be entered into by and among the Company and the underwriters (the “Underwriting Agreement”).

We are acting as counsel for the Company in connection with the sale of the Shares and Representatives’ Warrant and the registration of the Shares and the Representatives’ Warrant (including the Representatives’ Warrant Shares) by the Company. In such capacity, we have examined originals or copies, certified or otherwise identified to our satisfaction, of such documents, corporate records, certificates of public officials and other instruments as we have deemed necessary for the purposes of rendering this opinion. In our examination, we have assumed the genuineness of all signatures, the authenticity of all documents submitted to us as originals, the conformity with the originals of all documents submitted to us as copies, the authenticity of the originals of such documents and the legal competence of all signatories to such documents.

We are members of the Bar of the State of California and this opinion is limited solely to the federal laws of the United States of America, the General Corporation Law of the State of Delaware (including the statutory provisions and all applicable judicial decisions interpreting those laws), and, as to the Representatives’ Warrant constituting a valid and legally binding obligation of the Company, solely to the laws of the State of New York.

On the basis of the foregoing, we are of the opinion that:

Atlanta   BEIJING   Chicago   Hong Kong   New York   Norfolk   Orange   County   Portland
Raleigh   Richmond   San Diego   Shanghai   Tysons Corner   Virginia Beach   Washington, DC

Polar Power, Inc.

November 18, 2016

Page 2

We consent to the use of this opinion as an exhibit to the Registration Statement, and we consent to the reference of our name under the caption “Legal Matters” in the prospectus forming part of the Registration Statement.