What is the context of your question? Comparing PV panels maybe?Does more voltage mean automatically more generated current ?
Thx but that doesn’t answer my question :Volts x Amps = Watts
Convert everything to watts when comparing loads and you'll get the idea.
Raising the voltage means LESS current is needed to get the same watts (power)
Please look at my reply to &seneysolarWhat is the context of your question? Comparing PV panels maybe?
Edit: I re-thought it through and the mppt is probably finding different current power points for the two strings. It looks like it's working ok.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 current than the smaller string, do you have an idea what could be the reason for this ?
That is a minor performance difference without an obvious explanation. Shading maybe, but they're probably not shaded.
In this comparison, 1 string of 10 in series, vs. 1 string in 20 in series, if the panels are all identical you would expect the voltage to be different and the current to be the same.
Yeah, but I had to re-think that all through, because wire distance would actually affect voltage, not current, I realized.Well your previous explanation isn’t quite wrong :
Both strings are connected in series, and the bigger one has quite longer wires as the smaller one !
No!
Yeah, but I had to re-think that all through, because wire distance would actually affect voltage, not current, I realized.
And then I realized that there is an MPPT involved, so we are not just dealing with electrical properties, but a variable algorithm operating within other constraints as well.
All together, it looks fine. I'm just a little scared for your MPPT with 20 panels in series. Hopefully that's within it's voltage limitations (1000v?).
Oy... I ticked a like your previous answer and then you changed itYeah, but I had to re-think that all through, because wire distance would actually affect voltage, not current, I realized.
Oh maybe I was right and I just didn't know it! Always gotta be on the defense in case someone's gonna come find a hole in my argument lol. They'll discover I'm an imposter!Wire distance will be (marginally) more ohms, so reduce current.
It should maximise power, whatever V x I will create max power...but why should the MPPT reduce the current ? Isn’t that counter-productive ?
The mppt is kind of feeling in the dark for the power point, and at some point it settles for good enough. It doesn't always find the mpp exactly.
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Ok,Oh maybe I was right and I just didn't know it! Always gotta be on the defense in case someone's gonna come find a hole in my argument lol. They'll discover I'm an imposter!
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?Oy... I ticked a like your previous answer and then you changed it
Wire distance will be (marginally) more ohms, so reduce current.
MPPT tracker range 350-800But 620V is very high... what is the range of the MPPT of your inverter, maybe the voltage is above the MPPT tracking range, resulting in the sub-optimal power?
If you have a DC clamp meter and can do so without risking touching the live parts, yesIs 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 ) ?