First Solar Buys RayTracker to Make Panels Follow Sun

First Solar Inc., the world’s biggest maker of thin-film solar modules, bought closely held RayTracker Inc. for an undisclosed amount to expand in sun-tracking technology.

First Solar will assimilate RayTracker’s nine employees and clients with the purchase, the Tempe, Arizona-based company said today in a statement. Tracking systems let solar panels follow the sun’s movements, increasing output from solar panels.