If you consume 1000 watts for one hour, that counts as 1 unit, and one unit equals to One Kilowatt Hour. So, first you will have to decide that in how much time you want to generate 1000 electric units. If you want to generate 1000 electric units in the space of a month, then for a standard solar panel of 250 watts, you will require 28 of them. If you install a solar power system of 260 wattage solar panels, then you will require 19 solar panels. This calculation is based on the 25% safety factor. Otherwise, you can decrease it to 16 solar panels of 360 watts.