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Sounds complicated. I found an easier way - there's a product called MollieSoft AudioWeb that runs a small web server on your PC, then you can listen to your audiobooks on the iPhone using just a web browser.
Yes, unfortunately the PC must be on since that is where the web server runs.
A good way to save electricity with your computer is to sleep or hibernate it when not in use. There are programs that do this automatically, such as WinSleep by MollieSoft - it lets you set up usage limits and a time schedule controlling when the computer should sleep. You also get an historical graph of when the computer was awake or asleep. See molliesoft dot com slash winsleep.
The best energy-saving compute tip is to just make sure it sleeps or hibernates when not in use. One way to do this is to use a program like MollieSoft WinSleep, which lets you define usage limits and a time schedule governing when your computer sleeps. It also shows you when it was awake or asleep over the last week or so.
A more advanced solution is to use a program that allows sleep or hibernate on a schedule, like molliesoft winsleep. It also shows a graph of when the computer was awake or asleep.