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grid parallel

PV mit Victron Multiplus II inkl. Speicher im Nebengebäude

Hallo, ich hätte eine kurze aber knifflige Frage

Ich möchte eine 10KW PV am Nebengebäude (Garage) inkl. 20kW Speicher installieren, welches vom 30m entfernten Haus mit 4mm³ 3phasig versorgt wird (Unterversorgung vom Haus) und darüber hinaus nur mit einer LAN-Erdkabel verbunden ist. Mit 3x Multiplus II 5000 inkl. Zubehör GX etc. sollte das funktionieren den Überschuss der in der PV-Garage erzeugt wird, über den Anschlusspunkt im Haus einzuspeisen solange Grid verfügbar. Sollte das Grid jetzt ausfallen, gehen die Multiplus auf Insel und die AC OUT sind in der Garage für jene Verbraucher nutzbar die nicht am Grid hängen. Das Haus ist natürlich dann nicht versorgt. So weit so gut bzw. schlecht

Im Hauptgebäude habe ich bereits eine funktionierende 3 phasig installierte Notstromversorgung mit einem manuellen Netztrennschalter (Grid/0/Notstrom) welcher mittels Kabel mit einem Diesel-Generator verbunden werden kann.

Jetzt die Frage: Könnte ich (sollte der Generator eingehen, der Diesel knapp werden...) nicht auch das HAUS über den AC OUT in der Garage über das selbe Kabel versorgen, mit dem ich ansonsten vom Generator versorgt werde?

Ein Problem das mir sofort gekommen ist, dass am Multiplus damit der AC OUT (Notstrom Garage) mit dem AC IN (Versorgung Garage) kurz geschlossen werden. Was macht der MULTIPLUS das wenn er über den AC-OUT selbst versorgt wird? Lässt sich das irgendwie lösen?

beste Grüße



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Die Kompletten Installationen werden bei mir von einem Elektro-Unternehmen durchgeführt. Nur mit Victron haben sie sich noch nicht sehr ausführlich beschäftigt.

wolfgang07 asked
ja-solala answered ·

8 Answers

EM24 Grid meter shows as AC-Load

Hi together,

I'm completely new to Victron-World and setup my first installation: Grid -> EM24 -> MP II (x3) on AC-IN, parallel the load. So a parallel installation of the MultiPlus II to the "grid" (no AC-Out is used).

Unfortunately it shows the pages a little bit strange: Grid is not available. The EM24 is configured as Grid meter. Instead the AC load shows the values of the EM 24. But the AC-Load should be: Grid + Inverter. But it looks like, that the control works fine (200W from Grid as minimum adjusted).

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Is there a way to change this?


Thank you and best,

Johannes

basstscho asked

0 Answers

Multiplus 2 verbinden sich nicht mehr mit dem Netz

Hallo!

Ich habe ein eigenartiges Problem mit meinem Victron System. (3x Multiplus II 5kW, Cerbo GX, 3x MPPT SmartSolar, 4x 5kWh Taico LiFePo4 via CAN verbunden und DVCC aktiviert)

Nach 2 Monaten problemlosen Inselbetrieb habe ich letzte Woche auf ESS umgestellt. Grid Code Austria TOR-Erzeuger A. Die ersten Tage habe ich mit begrenzter Einspeiseleistung von 800W getestet. Dann habe ich die Begrenzung deaktiviert. Einen Tag lang hat das System einwandfrei funktioniert. 86kWh erzeugt, 63kWh ins Netz eingespeist, 20 verbraucht und 3 in die Batterien geladen.

Am zweiten Tag hat sich das System gegen 15Uhr vom Netz getrennt.

Seit dem versuchen sich die Multis alle paar Minuten mit dem Netz zu verbinden, sind dann zwischen einer und mehreren Sekunden verbunden, dann fängt es kurz an zu brummen, das Netz wird getrennt, der Relais Test wieder ausgeführt und die Multis sind wieder im reinen Invertermodus. Es blinken keinerlei LEDs an den Geräten und im Dashboard werden keine Fehlercodes ausgegeben.

Ein weiteres Problem habe ich wenn ich mich via MK3 und Victron Connect auf die Multis verbinde. Nach ca. 1min melden alle 3 Multis "low battery" und schalten sich aus. Das Verhalten ist reproduzierbar und ist auch schon vor dem Problem mit der Verbindung zum Netz aufgetreten.

schaumi asked
schaumi answered ·

2 Answers

Why multiplus II 48/5000 reject the public network when configured every 03 in parallel with the ESS

Hi guys, I urgently need your help!!!

I installed a single-phase system with 03 multiplus II 48/5000 configured in parallel, a BYD 15kWh battery, a cerbo GX, 02 150/85 regulators and 30 330Wp solar panels.

The problem is the converters reject the public network (connected to the AC in) when installing the ESS. However, I followed all the instructions for the installation of the ESS (I specify that I have already used the same configuration on other installations and it works). I also checked individually for each converter if with the ESS installed the covertisseur accepts the AC in and it works.

The other point to emphasize is that when I configure only 02 multiplus in parallel with the same configuration, the AC in input is not rejected by the converters.

In summary, the system works correctly (accepts the AC in input) when using the ESS configuration with 02 multiplus II 48/5000 in parallel, but not when configuring the 03 multiplus in parallel.

alid asked
Paul B answered ·

1 Answer

EASY SOLAR 2 GX, max. wattage feeding back to grid?

Hello,

We are looking at the Multiplus 2 48/5000 with separate smart MPPT 150/60 or the EASY SOLAR 2 GX 48/3000

Maybe a silly question, but when the 48V batteries are full, how much of the exces PV can be

feed "directly" back into the grid using the EASY SOLAR 2?



I see the mppt inside the EASY SOLAR is a 250/70 can handle 4000W PV input,

but the inverter on the 48/3000 model can only supply 2400W at 230V so this would be the max wattage that can be fed back into the grid correct?



We are looking at installing a 3200W PV array btw.. lets say 80%of that figure on a decent day that's 2560 Watts
So that is close to the rated 2400W inverter power. But at max performance of the PV we lose at lot.



Maybe the EASY SOLAR 2 5000 or the Multi2 5000 with separate MPPT would be a better match
as they can most likely feed back 4000W into the grid..?
Or am i missing something?

Thanks for your reply!

Steve

mrsteve asked
mrsteve commented ·

2 Answers

Multiplus II AC IN vs AC out ramp up speed

I have my ESS system on a simple grid parallel setup with all the loads on the AC IN of the Multi, with an ET112 as grid meter. When there is a change on the loads, the ramping up/down of the inverter takes a few seconds to match it, resulting in overshoots of the grid setpoint. Heard someone mentioning on an youtube video that if the loads are instead installed on the AC outputs the ramping up/down is almost instantaneous resulting on much smaller overshoots, but found no info on it. Does anyone know if this is the case?

paulo-m asked
Jason - UK edited ·

1 Answer

ESS scheduled charging issue with high grid load on grid parallel setup (EV Charging / Time of Use Tariff)

Hi,

I have a grid parallel setup with ESS working perfectly, apart from when there is high grid load during a scheduled charging window.

Setup is as follows:

  • Multiplus-II (48/3000-35-32) inverter AC In connected to Grid, no connections to AC outs, with AC coupled PV on input side. CT clamp on meter tail connected to Multiplus-II for grid consumption monitoring.
  • Cerbo GX setup with ESS (With Batterylife Optimisation on) with scheduled charging setup to take advantage on my low rate overnight time of use tariff.
  • Batteries are 3 x Pylontech US2000C

Scheduled charging works fine until my EV charger kicks in (same window) and suddenly grid load is ~9.5kW with charger, baseload and EV 7.2kW charger, the charging then stops and the batteries start to discharge even though this is a scheduled charging window.

Is this expected behaviour? Surely the inverter should realise this is not current following through the inverter itself, just the AC side of the setup?

My idea for a 'quick' fix is to relocate the CT to my distribution board, as my EV charger is supplied from a separate DB directly from a distribution bus before the main DB, however the cables are tricky to access so keen to know if this will work before making access.

Any advice appreciated!

Thanks.

fjj asked
lackland answered ·

3 Answers

Fronius Primo an MP2 ESS Grid resynchronisation

Hi There,


a question is bugging me:


assume the following setup:


MP2 5000 in ESS setting with Fronius Primo 4.6 (with 4.4kwp) on AC1

Fronius is set to MG50

pylontech battery


What happens when the Grid fails ? --> Multi is taking over and is regualting the Primo via Frequency.


So Far so good.


But when the battery is nearly full or full, and the grid is comming back online ?

I think the multi needs to synchronise back to the grid. It goes back to 50 Hz. But what will the primo do ? When the primo output power goes up and the battery is full and the grid is not yet connected via the ess relays ?

Will there be a DC Ripple problem an system shutdown ?


Best Regards


Ralf



rl78 asked
Rob Duthie answered ·

1 Answer

Multiplus 2 GX mit us3000c schaltet nicht auf Netz um

Hallo

Ich habe einen neuen Multiplus 2 GX mit einer Pylontech US3000C.

Anschluss vom Netz an AC-in, Batterie,LAN,CAN und MK3.

Soweit so gut die Batterie wird erkannt und mit allen Details in der Remotekonsole angezeigt.

Die programmierung über VE Config mit dem ESS Assistenten klappte auch.

Aber nun schaltet der MP2 nicht das Netz zu uns sagt das die Batterie schwach ist obwohl SoC 49%

skyone79 asked
lifeingalicia answered ·

1 Answer

Grid connecting isn´t possible

Hi guys!

I´m running the following system: 3 x Multiplus II 48/5000, 1 x Cerbo, 3 x MPPT, 9 x Pylontech US 3000, EM 24 for measuring the grid. The system runs since about 7 months without any problems.

All units on the newest firmware, the cerbo runs on 2.84.

Since yesterday I´ve a problem: allthough the grid is here as all the time, the cerbo shows grid lost and doesn´t reconnect to the grid. I´ve started the system a few times without solving the problem.

My energy supplier has measured the grid and says everything is fine.

So I don´t understand this behaviour. The system tries about every 15 minutes to reconnect to the grid, then the relais in the Multiplus are switching and immediately comes the message: time synchronisation failed or one of the expected units were not found.

Anyone an idea why the Multis don´t switch trough to the grid?

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koro asked

0 Answers

Solar to Grid if not enough

I am moving my solar panels which were used Off grid on my RV until I built my new small house which is now ON the Grid. I am looking for a way to use the Grid if solar is not enough (only 1700W) currently and not blow a fuse. I need to know the settings on the Inverter/Charger and Charge Controller.

Electrically, I understand that I need to move the breakers off the Grid panel to a Critical Load panel, just 4 at this point and replace with a breaker just 30Amp breaker with the Victron Inverter/Charger in between. Do I need other isolation other than the Hot side fuse and I would prefer the transfer to be automatic.

I am not interested at feeding back to the Grid as that will never be the case until I get more panels, etc.

Does anyone have a drawing so I get it right the first time, otherwise I will not have heat, hot water, stove (all propane) and one kitchen lighting circuit if the Critical load output from the victron panel does not work


simple asked
kevgermany answered ·

1 Answer

AC coupled Quattro + Fronius (microgrid) + Huawei inverter

Hi folks,


I have a quattro + fronius microgrid that's not working very well (tried on output of quattro, tried on input... it's limiting the hell out of fronius output), so i'm currently using the fronius smart meter to limit injection to grid (undesirable as I pay for export).

But next week, I will install another 3Kw system with Huawei inverter (this will also be grid-tied and approved by the power co. for export).


Below is the diagram that I though on using. Basically just inserting the 3Kw Huawei inverter between the grid and the smart meter.

After this new installation, I can inject a bit more to grid from the fronius, or victron, as long as anti-islanding is obtained.


PS - my victron is acting up under heavy loads ( i need to warranty is someday...) from battery, so I am forced to user the EV charger directly form Grid or whenever I do have solar enough to discharge from battery less than 2-3kwh, hence the location.


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iromeo asked

0 Answers

multi plus 48/3000 parallel with grid

Hello.

I use a Multi plus 48/3000 inverter which is connected to the grid via the Virtual switch function. The batteries are charged only from MPPT.

The network comes into operation only when the batteries are discharged or when the consumption exceeds the value set by me. AC1 is 16 amps. The network also has 16 amps. The inverter has 13A.

How can I make the inverter work in parallel with the grid, in order to have a higher power? (16 amps + 13 amps).

Thank you

ciprian-dobrescu asked
ciprian-dobrescu commented ·

2 Answers

Problem with two Quattro in parallel. Sometimes instable.

Hello to all,

I have a problem with two Quattro. As soon as they run in parallel on the mains, the two inverters sporadically " oscillate ". They then make a loud humming noise and then switch off very briefly and then on again. Then it goes on again for some time without problems until it starts again.

With only one Quattro, the system works without any problems.

It also works without problems with both Quattro when the grid is switched off (off-grid).

The effect only occurs with parallel operation on the grid.

The AC and DC cabling is symmetrical (identical cables and cross-sections).

The AC and DC currents were measured and are almost identical/symmetrical (+/- 1-2 %).

The Quattro were parameterised with the MK3 via Quick-Configuration (network: Europe, as I live in Spain). Same type and firmware (updatet to newest).

It seems that the Quattro build each other up on the mains and then switch off briefly for safety. For a short time, very high currents (> 100A) flow on the DC side with only a low load.

I have already exchanged master and slave. Without any change. The problem persists.

No error message is displayed on the CCGX.

Can anyone give me tips on how to solve the problem?

Thank you very much!

Greetings from Spain, Thomas


211201 PV Stromlaufplan.pdf

tnt369 asked
tnt369 answered ·

2 Answers

SMA Tri10000 and multiplus inverter

Hi, All

I have a client who already has SMA tri10000 inverter and 7 kWp solar on site. He also have 10 kWh LTO battery and would like to connect with 3 of multi 3kVa inverter. We are in Australia and multi with battery is not allowed to connect to the grid. We are thinking to connecting SMA to multi and grid as back up. The idea is to install a relay on grid side, when battery is low , contactor close and use grid to supply load. When battery is above some value, use solar and battery to supply the load. All solar and battery energy will NOT be allowed to export to grid. and Grid will not charge battery. I am not sure whether we can achieve this as I did not find any info about 0 EXPORT from SMA - victron connection. Thanks

john2019 asked

0 Answers

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