Recent content by skyman

Well i am no longer sure that such thing doesn’t exist : Look at this one https://www.specialized.net/test-equipment/power-quality-analyzers/non-contact-volt-detectors/extech-381676a-pen-digital-multimeter-w-voltage-detector.html

@jimf909 @hwy17 I just found out that my digital clamp Meter measures only AC current !! I am looking online for a new clamp meter that can measure DC current as well, but before I buy one I want to ask you if you know a clamp meter that can also measure DC voltage in a contactless way : I...

@All Thank you for the insightful tips. However there is still a missing piece of puzzle and nobody mentioned it : A current leakage somewhere in the string ( a damaged MC4 or Panel itself ) could reduce the whole current transmitted to the inverter Isn’t this a mechanistically plausible cause ?

Yes I have Clamp meter, please correct me if I am wrong : Clamp meters offer a contactless way of measuring current but it can’t measure voltage in a contactless way.

MPPT tracker range 350-800

So longer wires means automatically lower ohms resistance ? If we measure insulation resistance we expect higher resistance at the smaller string than the bigger one, right?

Ok, I have an additional question for you : Is it safe to measure string’s current while the inverter is running with clamp meter ( measuring current at the inverter’s DC input with clamp meter ) ?

but why should the MPPT reduce the current ? Isn’t that counter-productive ? The string that has 20 panels has a max VOC 620 volt while the smaller one has 320 volt, so in total 940 volt

No! The smaller string lays approx 3 meters below the bigger one !

Well your previous explanation isn’t quite wrong : Both strings are connected in series, and the bigger one has quite longer wires than the smaller one !

Please look at my reply to &seneysolar I hope you could give some useful tips on this Thx

Thx but that doesn’t answer my question : I have two strings, one string has 10 panels and the other has 20 panels. The panels are the same and have the same specs. By looking at the output of each string, I notice that the bigger string ( that has more panels ) has a higher voltage but less...

Hi Does more voltage mean automatically more generated current ?

No combiner boxes, strings are totally separate

Only string 1 is plugged in : voltage 606.1