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About MPP configuration


Tazar
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Hello, i have one maybe stupid question but i cant explain it :( 

What are the difference between MPP configurations - MPP1, MPP2, MPP3 ...... MPP10 and MPP1+2+3++++10? 

In first case i have 10 strings with 18 pv modules and in second i have 12 strings (second one is auto selected from the program). Inverter is Huawei SUn2000-100KTL - M1 and the modules are Jinko JKM460M. When i try to make 2 string in parallel on 1 MPP i exceed 26A. 

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Hi Tazar,

some inverters have the possibility to interconnect the MPP trackers. The inputs then share power electronics inside the inverter which can sometimes be of advantage. For instance, the allowed max current can be higher. We call that parallel operation.

The Huawei SUN2000-100KTL-M1 however doesn't have that possiblity:

grafik.png

So I don't know how you set up th examples that you mentioned. Also, if I try to connect 18 PV modules of type Jinkop JKM460M to one MPP tracker of the SUN2000-100KTL, the maximum voltage is exceeded.

Could you provide screenshots of the two configurations that you want to learn more about? This would be really helpful in that case.

Kind regards,

Martin

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That's really strange because I can't get it to do that config for me either. The inverter specs clearly state that the MPP trackers cannot be interconnected.

 

 

 

 

image.thumb.png.498c08794ee839514fb4cc7aea842971.png

 

What version of the inverter information are you using, maybe the data was wrong in a previous version?

 

image.thumb.png.d14d0766bcdf90dc581640799e7870ed.png

 

@developer_mh I think that the voltage is fine. It's outside of the MPPT parameter (1000V) for me but within the "max input voltage" (1100V). It would also depend on the location, azimuth and tilt of the solar panels since PVSOL per default calculates the open circuit voltage at -10°C and 1000W/m2 if I'm not mistaken.

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Ok, and what exactly means interconnected? How the installer will define this connection? Does the inverter itself understand that it is in such a mode or is it set from somewhere? What is the scheme of connecting the strings in this situation? I guess the situation is the same in the attached photo?

Screenshot_3.jpg

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Hi Tazar,

the parallel operation mode must be supported by the inverter and is defined by the installer upon installation. How exactly this is achieved will be different across inverter models, but as an example see this screenshot taken from a manual of the Fronius Gen24 inverter:

grafik.png

Taken from here, page 63:

https://www.fronius.com/~/downloads/Solar Energy/Operating Instructions/42%2C0426%2C0419%2CEN.pdf

In this example, you connect your two module areas to the inverter as if they were one (only one plus and one minus cable going to the inverter, using only one DC inlet), but then, as a installer, you bridge the input on a second DC inlet. In this case, this allows for a double maximum current.

Hope that clarifies the matter a bit, kind regards,

Martin

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