Merick,
Running a TV and such is one thing, (maybe 300 watts) and running a microwave (1500 watts) are two very different things. The little inverter for the entertainment systems can probably be had for less than 40$ for a cheapie, and can be simply wired.
But the 1500+ watt inverter will need to be next to the batteries because it will be wanting 150 amperes from the house bank. It will have to be wired with figure thick (2~00 AWG) cable. Not all microwave like running from inverter power. Decide what you want to do and how much you are willing to spend before you jump in.
This is want I did a lot of on boats before the depression.
Matt