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Old 03-03-2014, 09:36 PM   #15
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What happens to the panel if the output is dead shorted? I can't imagine that it would do the panel any good...


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<snip>

The fuse between the panels and the charge controller is not absolutely necessary, as the panel output (unlike a battery) is self limiting by the panel capacity and sunshine and the battery does not back feed through the controller. A fuse between the battery and charge controller is correct though.
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Old 03-03-2014, 09:50 PM   #16
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A dead short on a panel is not at all harmful to the panel. It is a common way to test panel output both at the factory and in the field. Again, current does not rise above rated output on a dead short situation, unlike a storage battery.

In essence when the panel is charging a battery at full rated panel output the panel sees the battery in the same way it would a dead short.
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Old 03-03-2014, 10:02 PM   #17
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I would not have guessed that - so I definitely learned something today!

Thanks!!


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Originally Posted by idroba View Post
A dead short on a panel is not at all harmful to the panel. It is a common way to test panel output both at the factory and in the field. Again, current does not rise above rated output on a dead short situation, unlike a storage battery.

In essence when the panel is charging a battery at full rated panel output the panel sees the battery in the same way it would a dead short.
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Old 03-03-2014, 10:28 PM   #18
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I should back off slightly on my statement. A single panel or a string of panels can be shorted with no issues, but when a set of panels or strings is put together, each string should be fused or breakered so a fault on one does not take the total current of the other strings. In larger many paneled systems, that function is done in a combiner box.

The energy in the shorted panel is simply dissipated over the surface of the panel which would get no hotter than it would not producing any power at all.
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Old 03-03-2014, 11:54 PM   #19
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I should back off slightly on my statement. A single panel or a string of panels can be shorted with no issues, but when a set of panels or strings is put together, each string should be fused or breakered so a fault on one does not take the total current of the other strings. In larger many paneled systems, that function is done in a combiner box.

The energy in the shorted panel is simply dissipated over the surface of the panel which would get no hotter than it would not producing any power at all.
So an open circuit or a short circuit - neither one will damage the panel? Huh!!
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