That depends on many things.... not the least of wich is your load.
If you get 90% if the panel rating and an insolation number of 5, then the two panels will produce 2 * 200 * 5 * .9 = 1800W hr. Is that enough to cover your needs?
BTW: If your reaction to the question about your needs is "I don't know", then stop everything and do an energy audit in order to understand your needs. I use this tool:
To get the spreadsheet, click on the orange button at the top of this page. This sheet is intended to help you plan your system. Fill it out down to the last decimal place, look at the results..... and then make your best guess;) Notes...
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