question

eoin avatar image
eoin asked

mppt rs 450|200tr one imput lower than others

I installed 36 pannels in 4 strings all same orientation and no shading. The 450|200tr has 4 imputs No.4 has allways a lower yield. In low light this is particularly noticeable. I have swopped the strings around to see if the problem was in the pannels but No.4 imput is allways down on performance. I set up the system 103 days ago with just 24 pannels so I wasn't using Imput No.4 then I completed the arrays 51 days ago and I've been hoping the problem will go away but no joy.

These are the figures for today:

No.1 8.3kwh, 2251w, 365.37v

No.2 8.2kwh, 2190w, 365.1v

No.3 8.5kwh, 2333w, 356.47v

No.4 7.2kwh, 2103w, 366.78v

mppt rs
11 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Alexandra avatar image Alexandra ♦ commented ·

And if you switch off one other string to make this one work harder?

Do you hit current limiting at all (200A)


1 Like 1 ·
Show more comments
nesswill avatar image nesswill commented ·

Is string 4 at the exact same angle (might face the same way but the angle to the sun will make a difference) as the other 3 strings?

Can you post the PV Spec's/type please.

1 Like 1 ·
Show more comments
1 Answer
eoin avatar image
eoin answered ·

The power loss is equivalent to 1.29 pannels, I've 36 pannels I think it is an acceptable loss considering the work to fix it. Maby I'm too lazy or too rich.

1 comment
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Guy Stewart (Victron Community Manager) avatar image Guy Stewart (Victron Community Manager) ♦♦ commented ·
Very funny accepted answer @Eoin :))

I agree with you, it's a bit weird, but also not enough to worry about.

Thanks for posting. I'll keep my eyes out for other similar situations.

1 Like 1 ·