Hello
I have a system that is un-centralized with same battery bank and it supplies power to different areas as the system comprise of two multiplus 5000VA, two Quattro 10000VA and one Quattro 5000VA. Battery bank is 75KWH MG batteries @7.5Kwh 10 pieces. I experience a problem of power outage due to battery temperature on the Master LV BMS. Can I get a suitable solution on this system

Bonjour,

J'en appelle à votre savoir.

Dans mon véhicule j'ai actuellement et pas encore brancher ou paramétré attente du mk3 un MultiPlus 12/800 et un phoenix inverter 12/1200 sur deux circuits ac différents.

J'ai besoin de plus de 800w pour la plaque vitrocéramique c'est pour ça l'inverter.

Tout le reste tourne sous les 800w.

Système sous raspberry pi sous Venus OS.

J'aimerais me faciliter la vie et avoir le MultiPlus et l'inverter communiquant et travaillant en cascade, j'ai vue la possibilité d'utilisé l'inverter comme un générateur.

L'un de vous aurez t'il un schéma de montage ou des explications.

Plus les consignes du branchement sur l AC.

Merci pour votre précieuse aide.

Hi
I have a pair of Multiplus II 48/5000 (240V) in Parallel and I keep getting a "High DC Ripple: Warning"

well I say 'keep gettting' it's happend twice, once when a high load switched off (kettle)
but also once when we were just ticking over at 300w

before some helpfull person says read the "Wiring Unlimited book".
I have, thanks !
the battery cables are short and a good size, and we did our best to make them all the same lengths

AND my question is:
what is the best way to monitor the system.

I don't know if it is relevant, but the slave seems to be louder than the master, (as if it's working harder) is there a way to monitor the out put of each unit separately ??

and/or is there a way to tell witch one is tripping the warning (master or slave)

Cheers

I just watched the Online Training video
9.1 Three-phase and parallel system theory
https://vimeo.com/415780430?embedded=true&source=video_title&owner=104980539
At time 3:14, when discussing "3 Phase" config, the schematic on the right is for "Parallel"
At time 6:49, when discussing "Parallel" config, the schematic on the right is for "3 Phase"

@Margreet Leeftink (Victron Energy Staff)

I am part way through an installation and have come to question some elements of the configuration. I would like to get some expert knowledge on the plan. My apologies for the long question, but this is a kind of complicated scenario and I wanted to describe the situation as clearly as possible.

My original installation as hired out was to install a Victron MultiPlus 12/3000/120, BluePower panel, BMV-702 and six L16 Full River AGM batteries. This worked fine for a couple of years and then I went to upgrade my charging/inverting capacity. I installed a second MultiPlus (same) and Cerbo GX with Touch 70, but due to timing issues installed it as only a charger. This year I embarked on the project to fully install it as a charger/inverter. I wanted the extra charging capacity in addition to the ability to pass-thru greater than 50 amps. My shore power (and genset) is 240V 50A but for much of the year I must bypass the inverter because the transfer relay cannot take the sustained load in the boat, primarily driven by electric heaters. Additional requirements are that I only wanted to use one control device (Cerbo), and take advantage of PowerAssist.

It seemed a reasonably straightforward proposition, but a couple details have come up that make me question my strategy. The plan was to install the two MultiPluses in a parallel, split phase configuration. They would run 240V out and power the entire panel. It’s not reasonable at this time to presume I could run the air conditioners or 240V induction stove and oven from battery (other than for very short bits of time) but I was under the understanding that for PowerAssist to be effective, I had to run things this way to ensure the system was aware of ALL loads, so that it may turn PowerAssist on when needed. There were a few wiring considerations that had to be accounted for, but the biggest question mark just came up with the realization that what I generally consider to be 240V input is actually not. My home marina, where we live aboard, and many of the marinas we stop at during our summer cruising season are 208V which is in fact two legs of a three phase system. (The remainder of our cruising time is spent at anchor, where the genset is the mains supply, and is true 240V split phase with the phases 180°.) The lower voltage is pain in the rear, but not un-survivable, however as part of the grand project I am installing a toroidal isolation transformer with an auto sensing boost capability (14%). This should be mostly a good thing, but now I am considering whether the input phasing of the 208V, which is 120° will cause a problem in my planned environment. I had planned to configure the MultiPluses as 240V split phase (180°) output. I considered that in pass-thru mode the phasing of the 208V input would not cause a problem, it would be just passed through, effectively as it is today. And in pure inverter mode, the MultiPluses would provide 240V split phase (180°?) and all would be happy. BUT, now I am wondering what the situation would be if when running on 208V shore power, what happens if (when actually) PowerAssist gets activated?

To try to sum up and reduce this narrative to a couple simpler questions:

1. Can I run two MultiPlus 3000 units in parallel as described above, regardless of whether the source power is 208V with 2 x legs at 120° phasing AND/OR 240V with 2 legs at 180° phasing? And if so, any special configuration options to be chosen?
2. If not, how else should this be installed and configured, and is it possible to still have one Cerbo controlling both units?

Thanks....Randy

Greetings Community,

I have a quattro parallel installation 2x8kVA running in ESS with a slight imbalance.

The system is newly commissioned and as far as possible Victron guidelines have been followed with respect to battery sizing, cabling sizing, layout etc. In general the system appears to be running well with the ESS assistant. I have two items of concern that may be interlinked:

1. Shortly after commissioning the local grid transformer failed and the system has been running continuously for weeks with no grid. Effectively off-grid. Is running with ESS in this way an issue?

2. There is an imbalance on the inverters. At varying loads (but not full load) I have measured a difference of about 8% between the two units' DC current, and roughly 8% between units AC currents. The lower loaded unit (the master) seemingly more noisy (hum/buzz) than the higher loaded unit. Is this difference sufficient to cause concern?

Other potentially useful information. The system has 800Ah of Pylontech UP5000 capacity, it has a Cerbo unit, 2x 150/75 SmartSolar MPPTs and (for indication only) a BMV measuring at the battery. Although the system is sized at 16kVA it will most likely never be fully loaded, the owner requested suffiecient headroom to ensure the system was not stressed.

I have searched the forums but have not found any definitive answers that state what level of imbalance is of concern and at what point noise should be concerning. Any help or guidance would be greatly appreciated.

Thank you.

I'd like to parallel 3 x 5000VA multiplus together. Would anyone be willing to send me a document on how to do this?

The same system above will also call an ATS of a 20KVA generator in when battery is critical - through a cerbo

If anyone can help with the above info, I'd be most grateful

Hi all,

how can this configuration be succesful?

Two Multiplus 3000; connectet to the same Battery bank; the first one is configured as an ESS System with connection over Ac-in to the house powernet. At the Ac-out there is a offgrid net with connection to the laundry and the cleaner.

Now there should be a second one with a separate offgrid net, to supply all cooling systems.

How can the second one be connected to the cerbo?

How can the second Multiplus 3000 be configured?

Thanks for help

Hello everyone!

I have an offgrid system with a 48v multiplus 1200, no grid power at all.

Recently i installed a 3Kw water heater and bought a Multiplus II 48v 5000, wich i want to install on the same battery bank as 1200.

I want to keep using the 1200 all the time, and the 5000 to be wired to Ac-in to the 1200, in standby, and pass through it power when the heater is turned on, or the power needed exceeds 1200s capabilities. Is this possible?

I have a venus gx, do i need to connect the 5000 to it, or leave it it as a "dumb" generator?

Also, a generator can be connected only to multiplus 5000, right?

Thank you!

Hi everybody,

I am new to this community and I did read the manual for the Multiplus II 120. It shows a three inverter / 3-phase configuration with shared neutral on page 33.

It might be obvious but can it be configured as a 2 inverter / 2 phase configuration with shared neutral? This would require a 120deg phase offset between the two inverters.

P.S. I would use the split phase unit but I like to have 48V batteries.

Thanks for your patience with a nooby...

Just curious why the MPII 10KVA (and 8KVA) cannot be used in Parallel?

Hello everyone!

I have an offgrid system with a 48v multiplus 1200, no grid power at all.

Recently i installed a 3Kw water heater and bought a Multiplus II 48v 5000, wich i want to install on the same battery bank as 1200.

I want to keep using the 1200 all the time, and the 5000 to be wired to Ac-in to the 1200, in standby, and pass through it power when the heater is turned on, or the power needed exceeds 1200s capabilities. Is this possible?

I have a venus gx, do i need to connect the 5000 to it, or leave it it as a "dumb" generator?

Also, a generator can be connected only to multiplus 5000, right?

Thank you!

I believe the 8kVA and 10kVA Multiplus-II's cannot be paralleled. Will this be fixed with a future software upgrade or never?

If it will be possible in future, then when?

Hey,

2 pcs. Multiplus 24/3000 single phase parallel on one battery bank.

It is possible switch the second MP if the AC load reached a specific load?

VS is the way to go?

The Master MP can switch on a specific load the VS, but how can the slave MP listen to the VS?

best

Lars

When you have more than one Quattro II 48/5000 in parallel -- two in my case, master and slave -- what happens with the programmable relay outputs, the analog/digital input/output ports, and the temperature/voltage sense inputs?

Do you only use the ones on the master and ignore the ones on the slave, connect both in parallel, or do they appear duplicated so you get twice as many ports -- for example, two independent relays?