Shares of solar power companies tumbled in premarket trade Monday, as crude prices fell more than 22% amid a price war between Saudi Arabia and Russia. Solar stocks typically fall with crude price declines, as cheap oil makes the technology look less appealing. Electric car maker Tesla Inc. /zigman2/quotes/203558040/composite TSLA +5.04% shares were also lower, down 14% at last check, while its Chinese rival Nio Inc. /zigman2/quotes/204905836/composite NIO +2.63% was down 16%. Among solar stocks, Enphase Energy Inc. /zigman2/quotes/207948472/composite ENPH +6.07% was down 14%, Vivint Solar /zigman2/quotes/202100570/composite VSLR +9.56% was down 12%, Canadian Solar Inc. /zigman2/quotes/205481506/composite CSIQ +7.63% was down 11% and JinkoSolar Holding Co. Ltd. /zigman2/quotes/207601099/composite JKS +8.41% was down 10%. First Solar Inc. /zigman2/quotes/209356097/composite FSLR +2.85% and SolarEdge Technologies Inc. /zigman2/quotes/207754270/composite SEDG +4.81% were down 10%, Sunrun Inc. /zigman2/quotes/205021014/composite RUN +9.62% was down 9.6%.