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”).

Emerson Electric Co.’s (EMR) rating weakens this week, dropping to a D versus last week’s C. Emerson Electric Co. is a diversified global technology company that designs and supplies product technology and delivers engineering services and solutions in a range of industrial, commercial and consumer markets around the world. For more information, get Portfolio Grader’s complete analysis of EMR stock.

Ideal Power Inc. (IPWR) is having a tough week. The company’s rating falls from a D to a F. The company also gets F’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of IPWR stock.

Slipping from a C to a D rating, Plug Power Inc. (PLUG) takes a hit this week. Plug Power Inc. designs, develops, manufactures and commercializes fuel cell systems for forklifts and materials handling equipment. The company also gets F’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of PLUG stock.

This week, Ocean Power Technologies, Inc. (OPTT) drops from a D to a F rating. Ocean Power Technologies, Inc. manufactures equipment that generates electricity from the motion of ocean waves. 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 OPTT 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.