Using the multi-MPPT feature causes increased Inverter Loss over nominal inv. power

[c.katharotiya]

Hello,

Good afternoon

I am using PVsyst version 7.4.5 right now. Recently, I was working on a project capacity of  2008.55 kWp. It consisted of an East-West orientated PV system. I used the multi-MPPT feature to distribute the different sizes of strings. Having done the simulation, there was very high value of Inverter Loss over nominal inv. power (more than 2%). On the other hand, when I did not use the multi-MPPT feature and distributed the different sizes of strings within whole inverters, there was a very low value of inverter loss over nominal inv. power (-0.09%).

Is there any bug in the software when it comes to using the multi-MPPT feature for the East-West PV System? 

Thank you

[Linda Thoren]

Hello,

To our knowledge there is no bug in the multi-MPPT features. Large Inverter Losses over nominal inv. power could appears in the case if for instance the number of strings are not a multiple of the number of MPPT inputs or if the power sharing is not activated (with a green "active" light). Please read more about the multiple MPPT and power sharing in the following help pages:

https://www.pvsyst.com/help/powersharing.htm
https://www.pvsyst.com/help/multi-mppt_more-examples.htm

If you still have difficulties, please send your project as zip file to support@pvsyst.com and we can have a closer look at it.

Kind regards

[linkeshd]

@c.katharotiya Were you able to resolve the issue?  Thanks!

[Aidenn]

Hello. Is there an update here? c.katharotiya

[Linda Thoren]

We have a new video tutorial concerning the multi-MPPT and Power sharing feature, further explaining how to define your system.

 

[c.katharotiya]

Hello,

There is no bug in the multi-MPPT features. As I saw the video of Multi-MPPT and Power Sharing, It is just Workaround to share the different sizes of strings within the correct number of MPPT inputs and then everything seems to be fine.

Thank you so much for sending me this video.