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Inverter Losses


Shy A
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Hi,

I am simulating a 440kWp system with a Solectria central inverter.

The inverter's efficiency is 97.9%/97.5%, and there is shading on the roof.

I am using the module layout to accurately calculate the shading loss.

The inverter is loaded at 1.47 DC/AC - so there is power clipping.

My question relates to the various efficiency losses of the inverter, as can be seen in the image attached:

-1.6% Inverter Loss during operation (efficiency) - (this is higher than the max efficiency...)

-0.5% Inverter Loss over nominal inv. power - (this is the power clipping)

0.0% Inverter Loss due to power threshold

0.0% Inverter Loss over nominal inv. voltage

-1.4% Inverter Loss due to voltage threshold (is this due to the shading preventing the inverter from reaching operating/MPP voltage?)

My question is: why is the efficiency at 1.6%, where it should be 2-3%? does it have a relationship with the voltage threshold efficiency loss?

 

Capture.JPG.cd12e9df040b0c71b8eac91a3532e8ee.JPG

 

Thank you!

Shy

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  • 2 weeks later...

Hi Shy

There were indeed an error in the simulation when using the "Module Layout" option, up to the version 6.19, affecting the inverter efficiency (in fact the EArray value).

- Does this strange result still occur if you update to the latest version ?

If yes, please send me your whole project.

Yes, the Il_VmppMin may result of voltage drop due to shadings in the Module Layout part.

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