By midmorning, shares had slid 14.9% to $3.99.
The solar energy company recorded revenue of $29.9 million and a net loss of 2 cents a share.
Analysts surveyed by Thomson Reuters had anticipated revenue of $33.45 million and net losses of 6 cents a share.
The company declined to provide financial guidance for neither its first quarter nor fiscal 2014.
"Normal seasonal variance in revenue, the continued impact of inclement weather in first quarter of 2014, as well as continued investments in sales, marketing and in-house leasing capabilities is expected to affect results in the near term," the company said in a statement.
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TheStreet Ratings team rates REAL GOODS SOLAR INC as a Hold with a ratings score of C-. TheStreet Ratings Team has this to say about their recommendation:
"We rate REAL GOODS SOLAR INC (RGSE) a HOLD. The primary factors that have impacted our rating are mixed -- some indicating strength, some showing weaknesses, with little evidence to justify the expectation of either a positive or negative performance for this stock relative to most other stocks. The company's strengths can be seen in multiple areas, such as its revenue growth, compelling growth in net income and solid stock price performance. However, as a counter to these strengths, we also find weaknesses including poor profit margins and weak operating cash flow."