What happened Shares of microinverter maker Enphase Energy (NASDAQ: ENPH) were down as much as 10.9% in early trading today as the stock's nearly monthlong slide continues. As of 10:50 a.m. EDT, shares were still down 8% on the day, on trading volume that was already higher than the three-month average daily volume. So what There are a few things going on today that are pushing the stock lower. The first is that oil is also down today, and that's driving solar stocks lower. Most large solar stocks aren't down over 10%, but Enphase is trading at a premium to most other companies, so that can lead to higher volatility. Image source: Getty Images. Investors are also seeing a potential slowdown in the economy coming, and that could hurt the number of solar installations. For example, falling oil and natural gas prices would make competing energy sources cheaper, reducing the financial incentive for homeowners and business owners to go solar. Now what Most of today's move can be chalked up to volatility and the fact that Enphase's valuation will make the company more volatile than most. Remember that it was less than two months ago that investors were blown away by its great operating results in the second quarter of 2019. The financial performance is what long-term investors should focus on, not the day-to-day volatility now hitting the stock. 10 stocks we like better than Enphase Energy, Inc.When investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has quadrupled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and Enphase Energy, Inc. wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of June 1, 2019 Travis Hoium has no position in any of the stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.Source