Image source: SunPower. The mantle of largest solar panel manufacture is a curse these days. Not long ago, Suntech Power was the largest solar manufacturer in the world, but it became insolvent a year and a half ago after a series of financial missteps. The title was then handed to Yingli Green Energy, which was more than happy to tout its size as a competitive advantage. But the debt that Yingli Green Energy used to build the world's largest solar manufacturing company appears to be more than it can pay back, and a recent filing with the SEC brought up the fact that there was risk of it being a "going concern", a terrible sign for any company. Just how did we get here? Well, don't say we didn't warn you that this was coming. Built on a house of cards Yingli Green Energy's latest filing shows just how bad it's gotten for the company. $2.4 billion in debt is offset by just $387 million in cash, and the company lost $205.9 million, or $1.21 per share, last year.