question

broesel avatar image
broesel asked

equal strings on MPPT 450/200 not producing the same

Hi!


I have a Strange effect on a new MPPT 450/200.
There 4 identical Strings attached to the trackers.


When Sun starts in the morning you see all trackers rising identically, excpet tracker 2: It stays round about 10-20W below the other 3.

When i swap the strings, you see that it is not the string itself, because it stays on tracker 2 with the lower Wattage.

So somehow the MPPT gets less power on its Tracker 2 - during the day this normalises usually.
Anyone has seen the same or an idea what it might be?


Best regards

Broesel


mppt rs
2 comments
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seb71 avatar image seb71 commented ·

It stays round about 10-20W below the other 3.

Is this a typo?

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broesel avatar image broesel seb71 commented ·
No,


while the others produce for example 700W the tracker two only produces 680W.
Sometimes it is evenn 40W below.

Best regards.


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1 Answer
Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

Hi @Broesel,

A small variation between the strings is nothing to worry about.

I would guess the most likely reason is a variation in the accuracy or calibration of the component that is doing that measurement.

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