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

Generac Holdings Inc. (GNRC) earns a D this week, moving down from last week’s grade of C. Generac Holdings Inc. manufactures automatic, stationary standby and portable generators. For more information, get Portfolio Grader’s complete analysis of GNRC stock.

SL Industries, Inc. (SLI) slips from a C to a D this week. SL Industries, Inc. designs, manufactures, and markets power and data quality systems and equipment for industrial, medical, aerospace, and consumer applications. For more information, get Portfolio Grader’s complete analysis of SLI stock.

Hydrogenics Corporation (HYGS) is having a tough week. The company’s rating falls from a C to a D. Hydrogenics Corporation designs, develops, and manufactures industrial grade proton-exchange membrane fuel cell automated test stations. The company also gets F’s in sales growth, earnings momentum, and return on equity. For more information, get Portfolio Grader’s complete analysis of HYGS stock.

Highpower International, Inc. (HPJ) experiences a ratings drop this week, going from last week’s C to a D. Highpower International, Inc. develops and manufactures nickel metal hydride and lithium-ion rechargeable batteries and related products. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of HPJ 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.