Solar panels are rated assuming high noon on a clear summer day in Arizona IE optimal conditions. Under these conditions a new solar panel should produce its rated capacity.
Actual production will depend upon the difference between the insolation of your location, the season, time of day and the ideal. At night the actual production is virtually zero.
A 200 watt solar panel makes 200 watts in ideal conditions. That is why they call it a 200 watt panel.
Homemade Solar Power Videos : http://SolarPower.duebq.com/?wNj
in PERFECT conditions it would produce 200 watts.... per hour
in real world conditions it would be LUCKY to pass 100 watts per hour