It should be no surprise that our peak power production to date would have been within a day or two of the summer solstice. As each day goes by variations in cloud cover do have an effect, so our best day was not exactly the longest day, close though.
We put 38KWh onto the grid over and above what we used. this is for the 24 hours of 6/19/13
We seem to use about 80KWh per day on average, this is a lot for a residence, but we have two koi ponds with multiple pumps each running 24/7, as well as pumps for our swimming pool and spa. Thus the high power consumption.