(Sunpower article updated from March 22 with additional analyst commentary and news related to Sunpower, solar stock fundamentals and solar stock movements.)SAN JOSE, Calif. ( TheStreet) -- These days, it ain't easy being a U.S. solar company. Whether it's SunPower ( SPWRA), First Solar ( FSLR), Evergreen Solar ( ESLR) or Energy Conversion Devices ( ENER), positive sentiment about the U.S. solar stocks is hard to find lately. The latest batch of bad news for U.S. solar stocks came courtesy of SunPower's fourth quarter earnings -- delivered after the market close last Thursday -- and a Wall Street Journal report over the weekend that argued
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