Two of the most important systems in modern utility scale wind turbines are the pitch and yaw systems. The proper operations of these two systems are critical to both improve uptime and to produce the full rated power. Pitch or yaw failures cause costly downtime, require expensive replacement components and consume valuable technician time. One way to address these issues is to upgrade and improve the design of the existing electronics. One specific example of this is a battery charger used for pitch system back up batteries. This critical device is used to keep back up batteries fully charged in case of a power loss emergency. Underrated components inside this unit are susceptible to failure during normal operation. Elevated temperatures inthe hub intensify this failure mode. The solution to this problem is to replace the failing components with higher rated components which will be much less susceptible to failure.