This week, the ratings of 4 Electrical Equipment stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, AZZ Inc.’s (AZZ) rating worsens to a D from the company’s C rating a week ago. AZZ Inc. manufactures electrical equipment and components. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of AZZ stock.

Thermon Group Holdings, Inc. (THR) slips from a C to a D this week. Thermon Group Holdings, Inc. provides engineered thermal solutions for process industries. The company also gets F’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of THR stock.

Highpower International, Inc.’s (HPJ) rating weakens this week, dropping to a D versus last week’s B. Highpower International, Inc. develops and manufactures nickel metal hydride and lithium-ion rechargeable batteries and related products. For more information, get Portfolio Grader’s complete analysis of HPJ stock.

Plug Power Inc. (PLUG) earns a F this week, moving down from last week’s grade of D. Plug Power Inc. designs, develops, manufactures and commercializes fuel cell systems for forklifts and materials handling equipment. The company also gets F’s in sales growth, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of PLUG stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.