What does the Inverter do?
What is Inverter Service? How will it improve performance? on 2004 Toyota Prius
It won't improve performance. It will increase the longevity of your car. The coolant used on the inverter is only effective for 2~3 years, and needs to be flushed. http://artsautomotive.com/publications/7-hybrid/116-prius-30k-service/