Solarcity which is the largest US Solar Installer has got sued by Sunpower for stealing trade secrets. Note Sunpower which was recently bought by French Oil Giant Total is facing tough times. Sunpower which makes the most efficient solar panels in the world is facing tough competition from super cheap Chinese solar panels. In fact according to Total CEO the company would have been already bankrupt with Total support. Beside making solar panels, Sunpower is also one of the biggest solar integrators and developers. The company has been in the business of installing solar panels after it acquired solar system installer Powerlight.