Powerlite use premium grade components in all their generators. Starting with the engine, all of the engine manufacturers have national service agent and spare parts networks. The links below will help you with details of their respective service agents:
For their petrol range, Powerlite mostly use Honda engines from Honda Australia. The Honda service agent network is listed HERE.
Some petrol models have Briggs & Stratton / Vanguard engines, with their service agents listed HERE.
For their diesel range, they use both Yanmar Engines and Hatz Engines.
For specific generator/alternator warranty, servicing and spare parts inquiries for Powerlite Generators, you can find information HERE.