Friday, October 31st, 2014 - 7:22 pm 
(Arizona time)

This PV array was installed under a tree and as a result the branches of the tree were casting shadows on the PV modules.

These shadows have a severe impact on system performance because the current produced by a PV module is determined by the least illuminated cell in the PV module. In this case all three PV modules have shadows cast by the over-hanging tree.

In full sun we measured an output of about 5 amps with the shadows shown above. There was also an area of sap over one of the solar cells (photo does not show this). After the branches were trimmed back, the current increased to about 9.5 amps. Cleaning the sap covered area increased the current to 10.5 amps, the expected value for the three PV modules.

AzSC Blog

Targeting Climate Voters

Earlier this week the New York Times published an article about how environmental issues have become a major force in political advertising during this election cycle.

Continue Reading...

--- Find us on ---
Facebook Twitter Meetup Group Youtube Wikipedia Linked In
Why not Like Us on Facebook?
Or Follow us on Twitter?

Calendar

October 2014
S M T W T F S
28 29 30 1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31 1

Login or Register

We thank the following AzSC Sponsors:
ASEA Logo AriSEIA Logo PSM Logo