Dude, you dont have enough room, Unless your land lord is willing to let you tear down the outsdie wall of your aprtment.

AC units use a ton of power, and you wont get enough from a solar panel. Plus, you'd need to keep 1 or 2 car batteries in your living room for a homemade setup, but you just dont have enough sun, in a 700 sq ft apartment.

About the only thing that might make enough power for you, with your limited space wind be a small marine wind turbine. About the size of 2 direct tv dishes, your could mount it to the wall outside, and yuo might , might get enough power from that.

First use the load calculator to find out how much energy in terms of wattage your AC unit consumes per day. Then you have 2 choices. You can use the off grid calculator to figure out the size of a system it would take to power your ac unit completely detached from the utility. Or you can use the on grid calculator to see what size system you would need to connect a PV array to the grid to offset your AC usage.