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andreu-parramon-jovell avatar image
andreu-parramon-jovell asked

MPPT reads incorrectly battery Voltaje and doesn't charge

Hello,

I have 5 US5000 Pylontech batteries, a Cerbo GX, a Quattro and a MPPT 150/85.

Since yesterday at 14:00, MPPT went to absorption mode. Battery was at 89%, solar charger PV went from 4400W to 115W in a minute. Since then, MPPT is on absoption mode even batteries are low.


In remote Console I can see that the MPPT is reading incorrectly the batteries voltage.

See the photos below.

What is happening, and what should I do?


The alarm is because I tried to reset the whole installation. No alarm when on when this happened.


Thank you

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MPPT Controllers
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2 Answers
mscn avatar image
mscn answered ·

The fuse from MPPT Charger (to battery) would be my first guess, since i've observed "absorbtion-mode-fallbacks" for all my MPPT chargers in the past. All of them went into 0W absorbtion-mode when a single fuse died.

Additionally, check for firmware updates for your cerbo (or venus device) AND for your MPPT charger.

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andreu-parramon-jovell avatar image andreu-parramon-jovell commented ·

Thank you very much. Appreciate your fast answer.


Seems that's the case.


img-20230711-wa0008.jpgimg-20230711-wa0007.jpg


80A is too low right?



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Alexandra avatar image Alexandra ♦ andreu-parramon-jovell commented ·
@Andreu Parramon Jovell

Yes, 100A fuse would be better.

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andreu-parramon-jovell avatar image andreu-parramon-jovell Alexandra ♦ commented ·
Thank you!
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andreu-parramon-jovell avatar image
andreu-parramon-jovell answered ·

Sorry, I have a new question about this topic.


The fuses I use are 500V AC and 100A.


Does something happen if they are for alternating current?

Would something happen if positive fuse is 100A and negative is 80A?


Thank you so much

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