grid parity, page-36

Hi Jo found this "To give you a feeling for how much power the Sun provides, consider that on a sunny day, at solar noon, the sunlight at the surface of the Earth delivers about 1000 watts (one kilowatt) per square meter. A typical photovoltaic solar cell can convert about 15% of this to electricity, that is, about 150 watts (the best cells in the laboratory can go somewhat higher, up to about 34%, or 340 watts).
So Joy is right 85Watts per hr(8.5% efficiency)with good sun is very possible then x by hrs of sun.
But then dye may not be using 1000w of sun(as is the standard)I read that Norway is actually 850watts and Australia can be as high as 2900watts of solar radiation per Sqm hitting the ground.But 1000watts is the standard measure used.See there is this other factor called "insolation""The insolation of the sun can also be expressed in Suns, where one Sun equals 1000 W/m2 at the point of arrival, with kWh/(m2·day) displayed as hours/day.[4] When calculating the output of, for example, a photovoltaic panel, the angle of the sun relative to the panel needs to be taken into account as well as the insolation. http://en.wikipedia.org/wiki/Insolation#Earth.27s_insolation
Also see projection...Basically Joy is correct IMO The 1/3 sun is a bit confusing..Mj