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MultiPlus-II 10 kVA cannot connect to the grid

Hello dear colleagues. Yesterday I put into operation a system with a MultiPlus-II 10 kVA inverter with the latest firmware 497. In standalone mode, the inverter works stably, but when connected to the grid at the AC input, it behaves very strange. As soon as the inverter is connected to the grid, its transformer begins to hum, as if the load has increased dramatically, after which the Multi returns to inverter mode (no errors or notifications appear). Then he tries to connect to the grid again, and sometimes he still succeeds. In this case, a strange undulating sound of the transformer may occur, as if there is a frequency desynchronization, the cooling fans turn on. The voltage in the grid is about 235 volts, the frequency is 50 hertz. So the inverter can work for several minutes, but then everything repeats again.


I have over 30 stable running systems with Multi and Quattro and all the basic configuration settings are the same. I usually choose "Other" as the grid standard as Bulgaria is not on the list and we do not export energy to the grid. Faced with this problem, I decided to do some experiments with different standards. When I chose "Germany" - the problem disappeared, even the sound of the transformer became quieter. But the inverter began to react extremely slowly to switching on/off the loads: when a 3-kilowatt water heater is turned on, it first takes all this power from the grid, gradually transferring it to the battery, and this “transfer” can last about 5 minutes. When the water heater is turned off, the Multi starts to return 3 kW to the grid, and it also takes a few minutes to return to zero. In "Romania" mode, the Multi didn't even try to connect to the grid, and just continued to work offline. Then I decided to return the "Other" mode, but disable the UPS function. At first it worked well, but later the problem still happened again. As a result, while I left the system to work off-grid and went home.


In general, this is the first time I have encountered such a problem. Even systems with generators at the input work stably for me. I think that this is either a defect of a particular instance of the inverter, or there is some kind of problem in the firmware that gives such an effect in the 10 kVA modification (all my other Multis are 3, 5 and 8 kVA). I have 3 more 10 kVA Multis in stock and I could change and test them, but before that I want to know your opinion. What could be the reason for such strange behaviour? I also really hope for a response from Victron Energy employees.


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romarub asked
Lucian Popescu (Victron Energy Staff) answered ·

4 Answers

Mit Multiplus (NICHT 2) einspeisen

Hallo liebes Forum, ich bearbeite zur Zeit ein Hochschulprojekt, in dem wir ein Modelkraftwerk bauen. Wir haben eine Windanlage, zugehöriger Gleichrichter, Batterie und Multiplus. Ziel wäre es aus dem 24 V Netz über den Wechselrichter einspeisen zu können. Welche Einstellungen muss ich dabei beachten?

julian-ziegler asked
julian-ziegler edited ·

0 Answers

Time delay grid sync

I am needing to add a time delay for a MPii to sync and accept grid power. The scenario is that some gated estates in South Africa require 15-20min delay before inverters are allowed to sync to the grid after a grid failure to stagger and limit power draw on the infrastructure.


I know this is possible and there are a couple of other threads out there but the instructions are not very clear on how to setup the assistants and in what order. We also use ESS and South Africa Grid code.


Thanks!

mauromartini asked
chuff answered ·

3 Answers

Specifications in grid code standard not respected - agreement problem

i try to force 300 sec delay between grid restore power and ESS commutation relay :

i use "connection time" i find in the gris code Europe EN.. but no luck (60sec changed to 300 sec), the ESS commute grid after 20 sec.

Is there a bug???

chuff asked
chuff edited ·

0 Answers

Failed ESS grid set point following

Hi,

I using 2 multiplus ii 5000/48 in parallel and i disabled the grid feed-in from Ess and i set the grid setpoint 0 ..But he continues to have grid feed-in 30-200w...IS NOT ARROUND SET POINT.

With an single multiplus with the grid setpoint 0, feed-in it was accepatable 0.1-0.2kw per day , but with both multiplus in parallel is more than 1kw per day !!! i don't want this.

I found a temporary solution with setpoint at 100w+. But I don't want to take it 100w from grid when it's sunny outside or when I'm using the batteries.

My System: 2 x Multiplus II 5000/48 (paralell), 1 x Smartsolar Mppt 150/100, 1 x Smartsolar Mppt 150/70 Tr, Bmv-712, Venus Os 2.90, 3x battery balancer, battery bank 500Ah at 48v, 7.2kw solar panels.

Please help me to solve this problem. Thank you!

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pfloryann asked
pfloryann edited ·

0 Answers

Can the Multi RS Solar operate in Battery Priority Mode

What I'm after is operating the Multi RS Solar as follows:

1) Use batteries first then grid if batteries are flat

2) supplement the inverter output with grid under high load

3) charge batteries with solar when available

4) Charge batteries from grid between certain hours at night

5) NO grid feed in


If the Multi RS Solar won't do this, should I be using the MultiPlus-II instead?

semlohnhoj asked
nickdb commented ·

1 Answer

Multi RS Solar uses Grid instead of PylonTech and Solar panel

Hello Everyone,

in my father's house I have installed the Multi RS solar on PylonTech barltteries. thanks to other users in the forum I have managed it to make it running. if there is consumption on the deducted AC output, unfortunately the system prefers to switch directly to the grid and ignores the full batteries. only if ACin is switched off and the system is disconnected from the grid, it switches to the batteries.

I can imagine that this mode makes sense in mobile homes or in a boat. In my parents house it makes no sense this way and I have to put down the fire manually each time I want to use the batteries.


is there a setting that I haven't seen in the software? can someone please give me a hint?


thanks again to the community!

Elmar

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elmar-streich asked
semlohnhoj answered ·

3 Answers

Victron Quattro-II 48/5000/70-50-50 QUA482504010 certifications for german grid?

Hello,

as the Multiplus-II does not accept generators if configured for the german grid we need to use Victron Quattros-II 48/5000/70-50-50 QUA482504010. They can be bought in Germany but seem to lack certifications for the german grid.

When will the certifications for the german grid be available?

It would be sad if we have to switch to another manufacturer than Victron because of the lack of generator-support/certifications.


Thanx for any hint! :-)

renne asked
teezee answered ·

13 Answers

System Alarm Grid Lost

For a few days now we've been getting a system alarm that says "Grid Lost." I can highlight it on our CCGX screen, but it doesn't go away. (I.E. The warning triangle in the top of the screen keeps flashing no matter what I do.) It also does not register on the VRM site under Alarm Logs...

We have not lost grid power once in this time period.

I do however use the CCGX's relay and it's automatic Generator on/off rules to tell the Quattro when to pull power from the grid. (I do this so we can use the energy stored in our batteries first.) So while the Shorepower meter shows zero, we are still connected to the grid.

We also have a PV inverter connected to our Quattro's 230v output, which gave me a grid error once, but I've not seen that happen again. (Meaning it might have but then went away before I noticed it...)

Did something change in the firmware to cause us to get this alarm?

We were running 2.51 but it also happened when I updated it to 2.52.

Thanks to anyone that can help!

Scott


scottnelson asked
nickdb commented ·

4 Answers

Grid Code

Guten Tag


Ich bin am konfigurieren meines MULTIPLUS 2. Welchen GRID CODE brauche ich für die SCHWEIZ?


Freundliche Grüsse



Jürg Ledergerber




zaz asked
xvc answered ·

4 Answers

Grid Assist without ESS with only HUB-1

I have several 5kVA and 3kVA inverters all of them standalone. How can I setup grid assist without having to shell out a lot of money for ESS? HUB-1 should be able to do exactly what I want to do but I can't seem to be able to force grid assist to work. Do I need external HW even with a simple HUB-1 assistant?

I know HUB-1 is "depreciated" and I don't really care.

somerando asked

0 Answers

Generator to DC side of 3-phase grid connected system

Hi dear Victron community!

I have a grid connected three phase AC-out-coupled system with Multiplus-II, CerboGX, SmartShunt, Lynx distributor and battery balancers. Battery pack is 48V 600Ah made from 12 pcs of 12V lead acid GEL batteries (picture below).

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I would like to connect a back-up generator for the wintertime to help the batteries when the electricity price is really high and the SOC is getting low. There is three possible solutions in my mind.

1. Generator and changover switch to AC in of MPII. That needs a very powerful 3-phase generator which is expensive and there are troubles with feed-in.

2. Generator and Skylla charger to the DC side. Not a big generator needed but there is no VE.bus communication with the system.

3. Generator and another Multiplus (preferred). This way I could have intelligent communication, more flexibility and even one extra 1 phase output from the extra Multiplus. Is it possible and logical this way? Red colour is for new equipment. Is there anything else I should add (generator auto start for sure)?

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Any ideas, suggestions or examples are welcome...

Karl

Karl Laasik asked
Juha Tuomala answered ·

5 Answers

Multiplus Grid-Tied

I'd like to use the Victron Inverter MultiPlus II 48/8000/70-50 in 12KW system DC Coupled with an MPPT 250/100. I need to grid-tie the system in Italy. I want to setup the following configuration:

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All loads will be on the AC IN. So my questions are:

  1. Is it possible to setup this configuration and tell the multiplus II to supply loads with extra power coming from the panels?
  2. Is it possible to supply the loads during night by discarging the batteries and sending power to AC IN as needed?
  3. I read the recents posts about anti-islanding and CEI-021 however I'd like to know if there is any other update about GSE and usability of Multiplus II grid-tied in Italy?


Regards,

Matteo

Matteo Sperandio asked
w-sp answered ·

2 Answers

Multiplus 2 erkennt Netzversorgung an AC-in nicht mehr

Hallo,

Wir verfügen seit ca. 2 Jahren über ein 3-phasiges System mit Victron Multiplus 2 (5kVA) und Pylontech Batterie. Heute Morgen gegen 7 Uhr hat das System angefangen, die Akkus mit max. möglicher Leistung aus dem Versorgungsnetz aufzuladen, obwohl die Akkus ca. 50% voll waren.

Da ich keinen Grund für dass Laden erkennen konnte, habe ich das Versorgungsnetz mittels LS-Schalter abgeschaltet.

Seit dem Wiedereinschalten erkennen die Wechselrichter jedoch nicht mehr, dass an „AC in“ Spannung anliegt und ist im Inverter-Betrieb. Die 230V habe ich an den Eingängen aller WR nachgemessen und das passt von der Versorgungsseite soweit alles.

Es wurde auch nichts an der elektrischen Anlage geändert.

Hat jemand eine Idee, was der Grund sein könnte?

Falls weitere Infos benötigt werden, bin ich für Rückfragen jederzeit offen.

Vorab vielen Dank für die Unterstützung.

Grüße Kay.


kare-42 asked
kare-42 answered ·

1 Answer

ESS as an extra power supplier


Hi all

For an installation I want to use 3 Multiplus II to supply 14 kVA more than the limit of my power contract. This will be happening during two hours per day approx. For this I think I will select each multiplus to have a power of 5kVA.

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I saw in the manual of the multiplus II gx this configuration that is near to the one I want to install.

I need to fix the Grid power input to a maximum of 36kVA and my loads will have a peak of 50kVA. I know that is possible to change the grid metering with external meter. Each multiplus II 5000 accepts an external current sensor of 100 A. That will be more than the power that I need.

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My question is if this installation can limit my power input (Grid) using the limit grid setpoint on a GX device. I want to configure this parameter to 36kVA or a little lower to limit my grid consumption. All this using the external current.

And also if the internal control of Victron is reliable to not surpass this limit?


Thanks for reading and for any advice.

juan-perez asked

0 Answers

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