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Tom_M

New Hope, MN

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Posted: 07/12/18 08:06pm Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

I would clip the wires just like I said and see if the panel is ok. You can get by sans junction box.
Since the panel is off the roof it is probably unplugged, so clipping the wires would accomplish nothing.


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2oldman

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Posted: 07/12/18 11:24pm Link  |  Quote  |  Print  |  Notify Moderator

Tom_M wrote:

Since the panel is off the roof it is probably unplugged, so clipping the wires would accomplish nothing.
I have no idea what your response means.

Tom_M

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Posted: 07/13/18 06:45am Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

Tom_M wrote:

Since the panel is off the roof it is probably unplugged, so clipping the wires would accomplish nothing.
I have no idea what your response means.
Perhaps I'm interpreting "clipping the wires" incorrectly. The OP stated that the panel is off the roof so it is most likely disconnected from the system. Most panels have a pigtail with MC4 connectors, so are you suggesting that he clip off the connectors? Doing so would have no effect on his measurements.

2oldman

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Posted: 07/13/18 07:30am Link  |  Quote  |  Print  |  Notify Moderator

Tom_M wrote:

so are you suggesting that he clip off the connectors? Doing so would have no effect on his measurements.
That box looks so corroded I don't think I'd trust any measurement coming from there, which is what I understood him to say he did. What difference does it make if it's disconnected from the system?

* This post was edited 07/13/18 07:39am by 2oldman *

Tom_M

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Posted: 07/13/18 07:50am Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

What difference does it make if it's disconnected from the system?
If the panel is connected, there may be a short in the wiring or controller. This would result in a near zero voltage reading at the terminals of the panel. Disconnecting the panel should give the open circuit voltage (Voc). No need to cut off the pigtails.

2oldman

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Posted: 07/13/18 09:50am Link  |  Quote  |  Print  |  Notify Moderator

So you're saying that jct box is just fine.

Tom_M

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Posted: 07/13/18 09:57am Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

So you're saying that jct box is just fine.
I never implied that the junction box is fine. Just that cutting off the pigtail wires will make no difference in troubleshooting the problem.

Tom_M

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Posted: 07/13/18 10:14am Link  |  Quote  |  Print  |  Notify Moderator

Tom_M wrote:

2oldman wrote:

So you're saying that jct box is just fine.
I never implied that the junction box is fine. Just that cutting off the pigtail wires will make no difference in troubleshooting the problem.
I think I just figured out what our problem may be. The junction box is attached to the back of the panel. The wires in the picture are the pigtail wires that have the MC4 connectors on them. There are no wires between this junction box and panel.

2oldman

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Posted: 07/13/18 11:41am Link  |  Quote  |  Print  |  Notify Moderator

Tom_M wrote:

There are no wires between this junction box and panel.
Well, then the OP has a worse problem than I surmised.

time2roll

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Posted: 07/13/18 12:05pm Link  |  Quote  |  Print  |  Notify Moderator

Unless you see something obvious I would not attempt to repair the solar panel or the junction box.

I would not know how to test without separating everything like cutting the diodes out. But then you need to replace them with new. I would look for a new panel if the voltage and amps cannot be found at the end of the pigtails.


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