RE-Converting the homestead II

I would really be interested in household items using I could run DC only. My parents have an old blender that has a DC motor and a huge transformer inside. The motor is an 18vDC motor which I ran successfully after removing the transformer. Speed controls and all. This was made in the 1970s, I am interested in any new devices we could DE-AC.

What devices will -NOT- be efficient for this project? Why?

Thank you.