Unbalanced MPPTs, secondary unused on all but one inverter

[jaredm]

Hi! Having an issue with unbalanced MPPTs using the Fronius Primo in version 6.41. I've read all the posts I can find but can't seem to crack it.

I'm trying to create a system that uses:

- 6 Primo 15.0-1, each with 4 strings of 14 on MPPT1, with MPPT2 unused.

- 1 Primo 10.0-1 with 2 strings of 14 on MPPT1 and 1 string of 10 on MPPT2.

So I set up:

- Sub-array #1, Primo 15.0-1 with 6 MPPT inputs and "secondary unused" selected, and 24 strings of 14

- Sub-array #2, Primo 10.0-1 with 1 MPPT "main" input, and 2 strings of 14

- Sub-array #3, Primo 10.0-1 with 1 MPPT "secondary" input, and 1 string of 10

And I keep getting a "you have 6 main inputs in excess" error.

The thing is, it doesn't give me this error if I delete Sub-arrays #2 and #3, or if I delete Sub-array #1, only when all three are used.

Any idea what's going on?

[Lazare Fesnien]

Hi,

An improvement in version 7 has been made on this subject.

For more details please read:

https://www.pvsyst.com/help/inverter_multi_mppt.htm?zoom_highlightsub=second+input

https://www.pvsyst.com/help/multi_mppt_use.htm