I think you divided by 24 (P[pv]=E[pv]/24) for an average per hour and then used this value for the full day (Probably trying to work an average kWh figure without acounting for the fact that you would get 24 of them in a day).
If you drop that out the figures more or less match up with the actuals from frquixote.
0.8-1.4kW per square meter per day by ken's maths
1kW per square meter per day by frquixote solar panels
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