1 MPPT with 2 string of modules

[elisdown]

Hi,

 

Some of the market inverter is available of 2 strings per MPPT but there is always a warning in the software "You should define at least one string per inverter or MPPT Input".

 

What should I do if I am going to do the following layout?

- Sub-array # 1 : 1 MPPT with 2 string of 15 modules

- Sub-array # 2 : 1 MPPT with 2 string of 16 modules

- Sub-array # 3 : 1 MPPT with 2 string of 16 modules

[elisdown]

1 hour ago, elisdown said:

Hi,

 

Some of the market inverter is available of 2 strings per MPPT but there is always a warning in the software "You should define at least one string per inverter or MPPT Input".

 

What should I do if I am going to do the following layout?

- Sub-array # 1 : 1 MPPT with 2 string of 15 modules

- Sub-array # 2 : 1 MPPT with 2 string of 16 modules

- Sub-array # 3 : 1 MPPT with 2 string of 16 modules

FYR. I am using the Sunny Tripower CORE2 which has 12 independent MPPT and 2 strings per MPPT.

https://files.sma.de/downloads/STP110-60-AFCI-DS-en-20.pdf

 

Should I create an inverter config and set mannually to 3 MPPT? And the Max PV Current becomes 120A (40A Isc x 3 MPPT)?

[Muhammed Sarikaya]

Dear Elisdown,

You have to contact SMA if your modification will take into account the power sharing between each MPPT.

If you want to connect only 3 MPPTs out of 12 MPPTs, PVsyst will not allow it.

In reality, you should contact SMA to inquire whether it's possible to configure only 3 MPPTs and if it's allowed.

Regards,

Muhammed Sarikaya

[André Mermoud]

Just a remark concerning  your doubt about the warning   "You should define at least one string per inverter or MPPT Input".

This corresponds to the SubArray you are just defining: if you define N MPPT, you should obviously define at least N strings, i.e. at least one string per MPPT defined within this subarray.