[RE-wrenches] Short Circuit Cell Damage

[Dave Click]

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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