Not stupid at all.
Two ways of accomplishing this, depending on your needs. If you plan to only power a few 120V devices from the inverter, connecting with an extension cord directly to the inverter is the easiest. If you wish to power a few devices and don't want to be using extension cords, then a transfer switch will do the trick. Depending on how many things you wish to power and the amperage draw, will dictate the type and size of the transfer switch. You also have to be aware of inverter sizing and amount of battery storage. For instance, powering a flat screen TV, a couple of cell phone chargers, and a laptop can be done with a 300W inverter and a single 15 amp transfer switch. Trying to power microwave ovens, toasters, and coffee makers will mean a bigger inverter, more batteries, and a larger transfer switch.
Here is a
Downloadable spreadsheet calculator to assess your power needs and various solar power calculations.