Short-circuiting should be OK for crystalline cells, but some thin film
manufacturers ask you not to do this. On the jumper-cutting, I agree
with the others that you probably shouldn't create arcs just for fun!
On 2012/9/17 23:50, Mark Frye wrote:
Wrenches,
True or False: In a nominal sort of grid tied situation with string Voc
at about 300 VDC and Isc at about 6 or 7 amps......It is OK to install
modules on a roof in the sun and short the pos and neg together
indefinitely.
In other words modules can handle operating at Isc continuously without
damage. It is only if you get localized shading AND a failed bypass
diode that damaging hot spot heating can lead to failure?
I am reviewing an installation manual that recommends completing the
home run by connecting the pos and neg of the string with a single
jumper cable, folding the cable on itself in order to push it through to
a j-box and at some point later on, cutting the jumper in the j-box to
terminate the pos and negs to the home run.
I am concerned both about maintaining the string in a short circuit
condition and cutting the jumper while energized.
Any thoughts?
Mark Frye
Berkeley Solar Electric Systems
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