As has been already indicated, much depends upon your needs and plans. I have a solar array that is primarily designed for emergencies. So it is designed to operate some lights, charge computers and phones, operate the refrigrator, and operate a few fans. I do not use it for air conditioning, furnace fans, freezer, kitchen appliances, the barn, etc . While I do use it to a limited degree on an ongoing basis, it would be much larger if I saw it as my only source.
