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Green Renewable Energy Forum
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Solar Panel Issue - Maybe Faulty Diode?
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<blockquote data-quote="Marcel Grigore" data-source="post: 356517" data-attributes="member: 24198"><p>Hello everyone.</p><p></p><p>This is my first experience on a public forum, so please bear with me.</p><p></p><p>I have recently acquired a solar system which contains 4 x 85w BP solar panels, a STECA charge controller and 2 x 6V 400amh deep cycle batteries. I have the 4 panels connected in series and the 2 batteries linked in parallel. The panels are charging the batteries at 12.5A max in full sunny day, which I thought it is not really enough. I started disconnecting the solar panels one by one, to find out that one of them wasn't producing any Amps. I then opened the black box on the back on the panel, and checked the 2 diodes, the panel is fitted with. When I connect the voltmeter to the negative and positive of each diode, one diode is reading 9.4V and the other only 4.47V. I opened the other panel's boxes and checked the voltage, and every single diode produces around the 9.4-9.7V. </p><p></p><p>The questions I have are: Is this particular panel faulty? Is the diode at fault? How can I fix the problem? Could this damage the system?</p><p></p><p>I think I have described the issue accurate, and I hope that there is an answer to my question?</p><p></p><p>Many thanks</p><p></p><p>Marcel</p></blockquote><p></p>
[QUOTE="Marcel Grigore, post: 356517, member: 24198"] Hello everyone. This is my first experience on a public forum, so please bear with me. I have recently acquired a solar system which contains 4 x 85w BP solar panels, a STECA charge controller and 2 x 6V 400amh deep cycle batteries. I have the 4 panels connected in series and the 2 batteries linked in parallel. The panels are charging the batteries at 12.5A max in full sunny day, which I thought it is not really enough. I started disconnecting the solar panels one by one, to find out that one of them wasn't producing any Amps. I then opened the black box on the back on the panel, and checked the 2 diodes, the panel is fitted with. When I connect the voltmeter to the negative and positive of each diode, one diode is reading 9.4V and the other only 4.47V. I opened the other panel's boxes and checked the voltage, and every single diode produces around the 9.4-9.7V. The questions I have are: Is this particular panel faulty? Is the diode at fault? How can I fix the problem? Could this damage the system? I think I have described the issue accurate, and I hope that there is an answer to my question? Many thanks Marcel [/QUOTE]
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