Do I need an inverter:
Laptop: I have a DC/DC converter, these run around 50-150 bucks (I can not really see where the more expensive ones are better) check out MicroCenter. it lets me power the laptop direct off the battery.
Television: I have one that runs on 12 volt dc as well. (It is a small one though)
However I also have a neat little Prosine 2.0 2,000 watts of inverter it powers all the above PLUS the microwave and a few other things that do not have 12 volt options.
Do I need it...No.. I could run the genny when I wish to nuke a hot dog, but frankly.. It's nice to be able to make a bit of 120 volt without doing that.