Put another way, if I flip the breaker between a PV string and the charge controller, the voltage measured at the breaker on the PV side drops from 136.5V to around battery voltage.
Help, please! (reluctantly posting)
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Very little - which is what lead me into this investigation in the first place.
Recently I had excellent sunlight, including reflecting off of the snow, should be one of the best days of the winter, yet the CC peaked at about 7amps going to the batteries (in bulk charge mode). nearly 5kw of PVComment
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Why does that sound right. I would think that the panels would put out the combined amount of the Vmp rating at the CC and then lower to close to the battery voltage at the discharge. The OP is seeing a very large drop at the CC input terminals which I would think is strange even if the battery no longer needs to be charged.Comment
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Why does that sound right. I would think that the panels would put out the combined amount of the Vmp rating at the CC and then lower to close to the battery voltage at the discharge. The OP is seeing a very large drop at the CC input terminals which I would think is strange even if the battery no longer needs to be charged.
Oops, my bad. I, for some reason was seeing output voltage on the CC's battery output, not PV input. Sorry.2.2kw Suntech mono, Classic 200, NEW Trace SW4024Comment
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Hm, I am running out of ideas. I may have to try and get somebody else in here to help... not sure how to make that happen.Comment
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I'm now fairly confident that the panels themselves are bad - something must have happened that shorted them or something along those lines. Not sure what to do next.
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I would test your assumption and determine which ones are bad. If I read the earlier posts correctly there is still voltage coming from some of the panels.9 kW solar, 42kWh LFP storage. EV owner since 2012Comment
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Well, I haven't gone through all of them yet, but it is seeming like all that were connected to the system may be bad. Something happened out there....
They will make voltage, but no current. Can these be serviced? Or am I hooped...?
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Sorry, they make voltage and very little current - 0.2amps sort of deal, which a new panel in full sun was putting out nearly 10.Comment
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You may have damaged diodes in most of the panels. That is not a usual situation that happens but unless you can find a short or drain somewhere in the wiring between the panels and the CC I think you are correct your panels are suspect.Comment
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I've now got a temporary rigging of 7 panels that I had earmarked for another project. What a relief to finally see some power coming into the system from the sun....
But, now, to figure out if I can service/replace the diodes. The diodes are encased in rubber unfortunately.Comment
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I was hoping that you were right about the snow/ice in the connectors, but, I'm now certain that the diodes have been damaged on all panels that were connected to the system.
I've now got a temporary rigging of 7 panels that I had earmarked for another project. What a relief to finally see some power coming into the system from the sun....
But, now, to figure out if I can service/replace the diodes. The diodes are encased in rubber unfortunately.
Some panels are "field fixable" but the junction box needs to be accessible without the diodes being encapsulated.Comment
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This is what I am working with inside of the panels.
It looks like the three diodes read: TLIAN TL3050DY Y182401L
Again, any help or direction would be appreciated.
(yes, I scratched the terminal plates)Comment
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