question

thegsd avatar image
thegsd asked

strange behaviour - throttle to zero and activate grid

Hi @all,

I've got the following setup:

  • MPPT 250/60
  • MPPT 250/70
  • 3x MP2 3000 in 3-phase config
  • CerboGX
  • 3x Pylontech UC3000

Everything has the latest firmware installed, except the MP2. They are still on v497.

The setup works fine for about a year now. The Cerbo was the latest device that received a firmware update about 3 weeks ago. Since then everything worked as always. No config changes have been made for months.

Today I've noticed a strange behaviour. As soon as the battery reached 100%, the PV yield dropped to almost zero on both MPPTs even with a system load of about 2KW. the system did not even start discharging the battery. The battery stayed at 100%. All the system load was taken from the grid. That situation kept on going for nearly 2 hours and suddenly returned to normal.

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Does anyone have a clue what happened here ?

When searching the forum I've found some similiar threads a couple of years ago. Back then the firmware had been updated to fix a bug. That happened long ago and should be fixed by now IMHO.


Thanks in advance

René

Multiplus-IIcerbo gxPylontech
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1724705468831.png (22.2 KiB)
1724705490073.png (33.5 KiB)
1724705508704.png (30.3 KiB)
3 comments
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thegsd avatar image thegsd commented ·
maybe it's of some importance here, maybe not... but when looking at the data, I've noticed that the time when the system returned to normal behaviour was exactly 14:00 CET (12am UTC).
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Alexandra avatar image Alexandra ♦ thegsd commented ·

@TheGSD

First troubleshooting step is to update the inverter firmware and re program the inverters. Make sure all components are correctly programmed. And stop the auto update on the GX.

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thegsd avatar image thegsd Alexandra ♦ commented ·
tbh I'm afraid, that after updating and reprogramming the MPs, something else might no longer work as expected...


Auto-update on the Cerbo if off since the beginning.


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1 Answer
thegsd avatar image
thegsd answered ·

When looking at the Dynamic ESS "plan" for today, I can see, that the system plans to use the grid for consumption between 12:00 and 14:00.

dynamicess-plan.png


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