MPPT Production Drops When Battery 100%

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catarina-isabel asked Jan 25, '24

MPPT Production Drops When Battery 100%

Good afternoon everybody.

I have a victron system composed by: ET112 energy meter, 150/35 regulator, cerbo gx, multiplus II 48/3000 and a 3.5kWh battery from Dyness.

The system is configured so that in case of a grid failure, I have electricity at home, and I sell the excess as soon as the batteries are charged.

When the battery charge reaches 100%, the MPPT reduce abruptly the prodution, even though it's very sunny. Whenever I have good sunny days, as soon as the battery is charged, production drops.

Can you please help me?

Multiplus-II 150/35

captura-de-ecra-2024-01-24-164744.png (38.0 KiB)

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Answer 1 · 2024-07-08T11:23:06Z

cmorewood answered · Jul 08 at 11:23 AM

I have the same frustrating problem and in looking for an answer I found this.

https://community.victronenergy.com/questions/237470/cerbo-gx-bug-mppt-stops-power-production-in-ess-wh.html

I'm no expert, but it would be nice if one of the forum Technical engineers could take a look at it and tell us if it was the answer.

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Answer 2 · 2024-07-08T11:36:23Z

nickdb answered · Jul 08 at 11:36 AM

There could be many reasons.

Does the system show an ESS or state code at these times?

Any limits configured in ESS?

More detail is needed.

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Answer 3 · 2024-07-08T11:39:17Z

jetlag answered · Jul 08 at 11:39 AM

Is "Export excess DC Power" activated in the ESS settings? And if yes, is there maybe a limit set?

If it's not activated, the MPPT will only deliver that much power, that is just needed by the Multiplus2.

So please check this first.

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Answer 4 · 2024-07-08T12:00:47Z

cmorewood answered · Jul 08 at 12:00 PM

Thanks for the quick replys. No error codes.

I have 2 MPPTs running 2 strings on the same roof. No shading. One is an MPPT 250/60 REv2 and the other a 100/20. The latter will, as soon as the batteries reach 100% SOC, stop producing any power. The former will continue producing and exporting.

As far as I can see they are set up in the same way and I can't see any reason for the difference.

I don't remember having this problem last year.

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nickdb ♦♦ commented · Jul 08 at 12:08 PM

MPPT's don't load balance so if power demands drop, you can see one work and another not, it isn't spread across chargers evenly.

If ESS min SOC is set to 100% you can also see production issues at full charge, so that is never a good idea, but you would see ESS #1 displayed on the console and VRM.

Make sure you're not mixing wired and ve smart networking.

Also check that both have the same settings and profile and you see the same voltages at their terminals.

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Answer 5 · 2024-07-08T16:57:12Z

cmorewood answered · Jul 08 at 04:57 PM

ill go throught the settings again. thanks

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nickdb ♦♦ commented · Jul 08 at 05:05 PM

The system tends to honour the lower of a group of settings. It is best practice to configure the charger properly before using ESS and DVCC to coordinate.

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