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

Global Power Equipment Group’s (GLPW) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. Global Power Equipment designs, engineers, and manufactures gas turbine auxiliary equipment; and provides routine and specialty maintenance services to customers in the utility and industrial sectors. For more information, get Portfolio Grader’s complete analysis of GLPW stock.

The rating of Jinpan International (JST) declines this week from a C to a D. Jinpan International produces silicon wafers, solar cells, and solar modules. The stock also gets an F in Sales Growth. To get an in-depth look at JST, get Portfolio Grader’s complete analysis of JST stock.

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

SolarCity Corp. (SCTY) experiences a ratings drop this week, going from last week’s C to a D. SolarCity is engaged in the business of renewable energy services. The stock gets F’s in Equity and Cash Flow. As of Jan. 9, 2015, 19.4% of outstanding SolarCity Corp. shares were held short. To get an in-depth look at SCTY, get Portfolio Grader’s complete analysis of SCTY 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.