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3s2p 330w panels only producing 12 amps?

Lethenf

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Feb 26, 2021
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Haven't posted in a while but back into my build now. Between me getting in a motorcycle accident (got rear ended making a left turn) and my SO being hospitalized had a 8 month setback.

Back into building originally was planning 2s2px2 into 2x EPEVER 4210AN, but the panels won't quite fit and one of the Epevers died randomly and out of return/warranty. Now have 2s3p (planning 3s3p) of the posted panels and a victron 150/85. They were bought used from santan and are flat mounted. Before I install the last 3 does seeing 11 to 12 amps max at 90ish volts, 100° to 110°F panel surface, from roughly noon to 2 off the roof seem right? It seems awful low to me was expecting closer to 16 amps.
 

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How/where are you reading the amps?
If your batteries are near full, your SCC may be tapering the charge and drawing fewer amps than available/expected.
 
Remember that the 16a you're expecting is under perfect lab theoretical conditions, and you mention that they're used (degraded) and flat mounted (loss of efficiency) so if they're only putting about 12a INTO the SCC, that sounds about right.

Now, if that's 12a OUT of the SCC's, then either your batteries are full and it just doesn't need it or there are problems.
 
Sorry other way around 3 in series, 2 paralleled series. Eventually 9 total panels 3s3p.

Edit typo added information.
 

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This is about the best production I see from the current setup it will hover around there till 1530 or so local time. Will stay above 600 watts till 1800 or so.
 

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I would test each string separately to see what they are producing. I suspect one string might have connection issues or other problem(s).
 
These are the 2 strings individually, possible the power point differences are that far apart?

It is nice to be able to connect to the SCC from the roof.
 

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Both strings together a couple mins later
 

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These are the 2 strings individually, possible the power point differences are that far apart?
It appears to be the case. Either it’s individual panel differences or their solar exposure.
You would have to test at the panel level to learn more. It’s possible you could form better groups that work together better but that’s a bit of work.

You are still well below what I recall are 330w panels. I would be curious to try atleast one panel in as good a light as possible to see what’s up.
 
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