question

aleksejs avatar image
aleksejs asked

CERBO Badly control MPPT charger to get power.

Hi.

I have Vicrtron MPPT + Cerbo + Multiplus II.

I see many-many times Cerbo is unable to get full solar power from MPPT.

Today I see great sun, small power. (picture1) 2365W

After just CERBO restart in 1 minute I see maximal power (picture2) 2912W = > +20%

And this is happen daily.

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Can I somehow to ask CERBO to work better?


cerbo gx
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1709726353768.png (15.4 KiB)
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2 Answers
nickdb avatar image
nickdb answered ·

Not enough to go on here.

Tell us about your system and its settings, is it a managed Li battery? Are you using ESS? How is it configured? What about DVCC?

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aleksejs avatar image
aleksejs answered ·

I have ESS, I have no managed Li battery. Battery is fully charged:

(After reboot power stay at 2900) The problem is in Solar batteries voltage. Cerbo is trying to get much current, bat voltage dramatically decreases. It is visible at pic1 and pic2.

I do not understand how to control MPPT progress.

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nickdb avatar image nickdb ♦♦ commented ·

That is PV voltage, not battery.

You need to post more detail or no one can help.

Check your wiring and measure the battery voltages at the battery, inverter and mppt. Check they are the same.

Without a managed battery, something may have an off voltage reading that is being shared by the GX.

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aleksejs avatar image aleksejs nickdb ♦♦ commented ·

Voltages 91.8V and 143.4V - are solar battery voltages. I mean after Cerbo restart it could re-calculate the solar battery power witch is {solar U} * {possible solar I}

The point of restart:

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