I'm in California, near the beach and CA is slowly becomming a desert anyway. Charged batteries DO do something, No?Your solar cells are too small to power anything. At noon in the middle of summer, the 308 solar cells will produce 539W at only 0.5V. If you connect then in groups of 24 cells in series to make 12V then they can power a little 400W inverter. In winter the solar cells won't do anything.
Here is a link to a watt calculator. I'm not sure if it helps in anyway.It would be rather difficult to calculate your peak power requirements from a power bill.