Planning for solar installation this spring

I am currently running a 200w system with a 30A PWM controller and 2 225AH GC2 lead acid batteries. With a family of four charging computers, phones and regular use of the LED lihgts etc, we can keep the batteries in the 80-90% range if we are lucky enough to get a moderate amount of sun on the panels. Most of the time we only get a couple hours of sun due to trees and and have to run the inverter gen for a couple hours every few days to keep the batteries topped up. We tried using our coffee pot on the inverter, and while it works fine it just plain consumes too much power for a 200w system to recover from, even with a decent amount of sun... I have switched back to a stove top percolator coffee pot, which does a great job.
We will be adding another 200 watts this year to further reduce generator useage...