Monday, November 2, 2009

Only logged data is good data

Another upgrade to my new solar panels: A data logger for worldwide live access

A - relatively sunny day in November - 6kg saved carbon oxide!
Check it out at

For all who really like to know what this graphic really means:
The yellow area shows electric power (Watt produced) over time. At 10h the system has been switched on the first time otherwise it would start at 7h30 am with a nice slope. The "ideal" graph on a really sunny day looks like a gaussian bell curve. The green and red line are the contributions of the two identical module fields, so it is expected that the lines stay always together at about 50% of the total power. At about 12am they divert heavily - this is shadowing. One module field is exposed to a tree shadow which dramatically reduces the production of the whole string. Approx. two hours later the two line begin to merge again, this is when the shadow reaches the second field as well reducing the overall effectiveness.
Now all of this is not new - I knew it would happen and the consequences are quite clear -

The trees must go!

No comments:

Post a Comment