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MPP 1+2+3 configuration


RicardoM
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Good morning,

 

I am considering the following configuration of 5 strings of 18 modules each with the 20KTL Huawei inverter and AC-300M/60S modules:

image.png.0307a68183ee157e630babc07202d0b7.png

 

That is, not the typical configuration of two identical strings per MPP, as the current would be too high:

image.png.4d6664849fdde6725dff0151a0c7f022.png

 

I understand that the first configuration is possible, but I'm not sure how the connection would be done in the "real world". Would it be a string per MPP input entrance, leaving the sixth unused? How would the inverter know I'm not following the second configuration, which is not allowed?

 

Thanks in advance, kind regards,

 

Ricardo

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Hi Ricardo,

how it would be done in the real world is a very good question. I guess you should ask the Huawei people :) I quickly scanned the user and installation manual for the SUN2000-20 KTL but I did not find any settings that would tell the inverter how to handle the MPP trackers and DC inputs.

The ability to operate the MPP trackers together is something that the manufacturers enter into our database. So perhaps it would be best to ask the technical support of Huawei. support@huawei.com

Kind regards,

Martin

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Hi Ricardo,

I mean you could still use the configuration as in your version 2. The maximum current is only exceeded by 0.54 A, I guess that the energy losses due to current clipping will not be too high.

image.png

I just simulated it with one-minute values for Berlin, and the current clipping (down-regulation) is really insignificant.

Kind regards,

Martin

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