question

levistoth avatar image
levistoth asked

URGENT : VE Bus Error 5 and VE Bus Error 18 - I cant take it anymore!

Hi All,


I NEED HELP!

I am dealing with this issue since 4 months, please some-one help me, I posted here 2 threads, I emailed Victron, I talked with the Dealer, post on Reddit and nothing.

[@Victron staff]

I have an installation with the following :


9 x Victron 15 kVA Quattro ( 3 inverters / phase)

3 x Fronius 25 kW on the AC output 1

80 x Pylontech US2000C


I get VE Bus Error 5 and VE Bus Error 18, the wiring is correct, no issue on that, the settings are correct Victron on ESS as suggested by Victron and Fronius are setted up with MG50 and control via modbus.


I get the error only when there is high sun and we have production over 25-30 kW from the Fronius inverters, if the weather is not ok then the system is working fine without any issue, this also confirms that there is not problem on the wiring.

PS never had an issue during the night-time.


As I see, the problem is that the Fronius inverter is still producing to much even if the Victrons tell them to stop and that how there is a high voltage on the AC side, I have checked the graphs whenever the victron stops due to these errors, the voltage is around 240 V - 243 V, which should not be an issue. The Frequency is around 51 Hz.


what can I do to eliminate the issue, because now it`s really annoying, our client is calling us daily that the system is not woring, just today the system stopped working for 9 times and had to restart it.


As you will se below, the error comes from 11 o clok till 15:30 exactly when there is the biggest sun.


Please help me with this!

screenshot-2024-02-06-182438.png

VE.Bus
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Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·

Please add some pictures of the installation and a schematic.
How did you distributed the DC power?

We had a similar issue in a large system during high loads and the problem was a not optimal DC wiring.

80x US2000!?
For such a system I would have used another battery type maybe BYD LVL 15.4.

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levistoth avatar image levistoth Matthias Lange - DE ♦ commented ·

Yes, tought on that. We remade the total DC and AC cabling and still the same thing.


we have the following connections :


80 x us 2000 C

From each group of 8 inverters we have a pair of (+) and (-) cable which is connected to a DC panel on a + and - bus bar, I would like to mention that all DC cables from the batteries to this panel are exactly 4 meters long, we are using the generic AWG cable provided by pylontech.

From the Busbar we have exactly 4 meter of cables for each inverter of 150 ccm copper cable. (The busbar is equipped with DC fuses for 1200 A) - but the maximum possible charge or discharge is limited to 1000 A.


It`s an Eu financed project, we had to stick with these batteries....

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Alexandra avatar image Alexandra ♦ levistoth commented ·

With 9 x 15kva the possibility of a discharge being 2800A is more likely.


If you are only expecting a 1000A discharge why go so big on the inverter side? Could be half the system?

If it was derating sure to temperature an air con would have been cheaper and less complicated?

If PV for loads and charging, then DC charging and AC coupled combo would be better and also less complex.


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levistoth avatar image levistoth Alexandra ♦ commented ·
Totally agree , the idea of 9 x Victron`s is coming from 80 x US 2000C, where the max DCL is 2000 A.

Since the project is financed by EU we went for maximum, since probaly in the future might be more consumers.


Also We have calculated that at a medium irradiance of 50% we could charge the batteries from 30 % to 80% almoust every day

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6 Answers
Alexandra avatar image
Alexandra answered ·

@levistoth

Are you off-grid?

If the fronius are not responding then something is a bit off there maybe review the settings there.

Is the firmware on the fronius up to date?

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levistoth avatar image levistoth commented ·

we are ESS with Grid connected and zero export. I have tried to export 100 W, but did not helped.

Yes the Fronius Datamanager is up to date and all the inverters running the latest firmware.


On the Victron I run the 506 Firmware, tomorrow will try with 508 version which appeared currently.

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Alexandra avatar image Alexandra ♦ levistoth commented ·

And the setting on the fronius?

Would you mind sharing those?

The fronius like to produce equally over all phases. Do you have unbalanced phases?

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levistoth avatar image levistoth Alexandra ♦ commented ·
The fronius are in the following way :


1 x Master and 2 Slave, the master haves the datamanager and the slaves are without, they are linked on sunspec.


We have setted on all 3 inverters the MG50

Also added the control via modbus and we placed that the first thing to listen by the inverter is to be modbus.


also setted that the fronius inverters should work under the voltage limits of the Victrons with around 2 V ( 193 low limit and 253 V high limit)


As for the consumption, the biggest part of consumption is equal on each phase, but we have some monophase consumers as well, but there is never more than 3-4 kw difference between phases.


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Alexandra avatar image Alexandra ♦ levistoth commented ·
There are bunch more settings in the dno editor that needs to be done those are the ones I was interested in.
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levistoth avatar image levistoth Alexandra ♦ commented ·
totally True , we have the following settings in the DNO Editor :


Dynamic power reduction : No limit

Controllin priority : 1 Modbus, 2 Dynamic, 3 Ripple


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Alexandra avatar image Alexandra ♦ levistoth commented ·
https://www.victronenergy.com/media/pg/Energy_Storage_System/en/configuration.html#UUID-42f56b22-76b3-0c69-57c2-3e54b2e0df4e
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kevgermany avatar image
kevgermany answered ·

@levistoth I've passed this on to Victron.

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levistoth avatar image
levistoth answered ·

As an update - starnge thing whats happening :

the consumption is bouncing even back to 0, but in reality it`s not the case, it`s a constant consumption.


This thing happens only when we are chargong the battery, if i stop charging the battery the consumption is ok again.


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Alexandra avatar image Alexandra ♦ commented ·

@levistoth

I have seen issues like that when the network the fronius and GX are connected to is having addressing or other issues.

How are they connected together? For communication that is.

We have a network solution specifically for Victron with Fronius set ups because comms over WiFi can be an issue on some routers.

In your original post the not responding to ramp down commands would also point to networking problems (if they are not config).

I would start there and make a dedicated network for the Victron&Fronius combo so it is self contained, that then connects to the main network.

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mmh avatar image
mmh answered ·

Hi @levistoth

I struggled with a similar issue on a system with 6x15 kVA Quattro and 8x 15kW fronius.

What we found is that the grid connection was too small. These issues did not recur after upgrading. 300m 3-phase overhead line to 3x100mm2 aluminum (from 3x16 mm!)

How are you connected to the transformer and what is the distance?


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Lucian Popescu (Victron Energy Staff) avatar image
Lucian Popescu (Victron Energy Staff) answered ·

@levistoth someone from Darcom Energy will contact you tomorrow, I have spoken with them now. They will keep me posted.
Lucian

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Lucian Popescu (Victron Energy Staff) avatar image
Lucian Popescu (Victron Energy Staff) answered ·

@levistoth The system is not correctly designed, you are using paralleled MP-II 15K and that is not allowed.
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Alex Pescaru avatar image Alex Pescaru commented ·

Hi @Lucian Popescu (Victron Energy Staff)

He said he has Quattro ...

And from Quattro datasheet, it can be paralleled...

parallel.jpg


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