Key TakeawaysJefferies downgraded SolarEdge Technologies stock Tuesday, pointing to tough competition.The analysts said SolarEdge faces "significant headwinds" in Europe, as well as challenges in the U.S.Shares of SolarEdge tumbled in early trading Tuesday, before rebounding later in the session. SolarEdge Technologies (SEDG) shares tumbled in early trading Tuesday, before rebounding later in the session after Jefferies downgraded the stock, pointing to tough competition in the solar power industry. Jefferi ...