You have two steps to consider here. How much current you are drawing per day is going to determine both the size of your panels and the size of your battery bank
Let's say for example that you average 5A per draw hour. That means in 24 hours you will consume 24 x 5= 120A. Each 100W panel will produce 6A/hour or 30A per day if in 5 hours of sun in the summer. You will need at least 4 100W panels.
As far as the battery size goes, you really need to max discharge your battery 50-60%. If you are drawing 120A then your battery capacity needs to be between 240AH to 200AH. 2 Trojan 6V T105s 6V in series will give you 225AH.
For the whole system including batteries, solar panels, controller and cabling, you may be spending $1500(Just a WAG).
If you plan on using any more draw for other 12V needs, you need to bump up the values I just gave as an example.
