Our Solar Roof Hot Water System was installed on 28th February 2007.

The plot below shows typical data over two "Solar days". Of key importance is that on "Solar days" the temperature of the Hot Water the day after is still above the 120F "heat to" temperature for domestic hot water as recommended by Energy Star Home Saving Tips.

Actual data from our morning, noon and afternoon data collection demonstrates that on more than 80% of days our water temperture does not drop as low as 120F on the morning after a "Solar day".

NOTE: A "Solar day" is a term we are using for when the temperature of the water when heated only by the sun is warmer at the end of the day (the afternoon reading) than the temperature at the start of the day (the morning reading).
Solor Hot Water 2 day plot
We are collecting all our solar data.
Email: darrell AT nearto.us
Web: http://www.nearto.us/