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Multiplus-II

Increase of self-consumption and zero feed-in export

Hi,


I have a solar kit which is supposed to increase self-consumption of energy and to supply the electricity in grid failure, which contains:

1x PV On-Grid (3-phase) inverter Solax X3 MIC 10.0

1x Multi Plus II 48/3000

4x Polyontech US2000 2.4kWh lithium batteries

1xCCGX Victron energy

1x patch cable for connecting battery with ccgx

1xInterface MK3-USB (VE.Bus to USB)

1xRS485 to USB interface

1xRJ45 3m patch cable

1xRJ45 10m patch cable

1xET340 energy meter

36 Trina PV modules of 280Wp

DC cables, dc breakers, mounting construction etc.


I wanted to know if I can use the system for the increase of self-consumption and as a back-up supply, where the PV on-grid inverter and the battery inverter does not feed into the grid.

I'm confused because we have only one energy meter and I don't know how to connect the Multi Plus II and the Solax On-Grid inverter to that energy meter.

Can someone help?



arianitz asked
DayAndNight edited ·

1 Answer

Multiplus 12/3000/120-50 Ideal Grounding on Travel Trailer

I've spent quite a bit of time researching this question, in the Wiring Unlimited document, along with the Multiplus manual and a multitude of forum postings. I realize some elements of the question are largely redundant so I will try and be as specific as possible. This installation is for a personal RV, and although I'm not a licensed electrician I have done quite a bit of high voltage electrical work, and as a computer scientist have had some exposure to electrical engineering principles and issues when working with microcontrollers, etc, though most of my work does not involve machinery or process automation. I'm by no means an expert, however.


I'm working to complete an installation of 2xMultiplus 12/3000/120-50 inverters connected to a 6x100AH Battleborn battery bank in parallel configuration. I also have a SmartSolar 150/85 MPPT controller connected to 7x195Watt PV panels mounted on the roof. The Multiplus units are in a split phase parallel configuration. Proper size wiring and current protection devices (breakers and fuses) on both the A/C and DC side are installed and various points(E.G. pre inverter A/C breaker, post PV combiner to MPPT controller, post MPPT controller to battery bank, post battery bank pre inverter, pre trailer existing wiring connection, post inverter A/C to trailer, etc). Properly sized wiring is used based on the current protection devices in place and maximum intended sustained amperage taking into account insulation rating, conduit fill rules (where applicable), etc.


At this juncture I have completed the majority of the installation on the system but have come to a question on proper ground application. Currently all equipment functions without grounding the equipment separately to the chassis(although I have full intention of doing so), and I have tested the system in excess of 250amps continuous DC flow to the inverters for extended periods of time(E.G. by turning on the A/C, electric hot water heater, etc). After working through a number of configuration "tuning" issues, I'm happy with the results, although an added element of safety is left dangling out there.


With that in mind, I believe the following is accurate:

1) Each Multiplus should be separately grounded to the chassis using a conductor of equal size to the conductors used in DC +- in the inverter. In my case 4/0 wire with 105c insulation.

2) The Solar MPPT controller should be grounded to the chassis, again with the same principle outlined in 1 regarding wire sizing.

In both 1 and 2, it would be alternatively acceptable to utilize a wire size equal to the acceptable size requirements for the current protection(e.g. for the battery bank a 300AMP fuse is used) device.


This brings me to my question(s):

Currently the negative and positive leads running to/from the inverters are connected to BusBars rated for 600A each. The positive side, prior to reaching the bus bars from the battery bank is fused, and then runs to a disconnect, then to the bus bar. The negative side, through a shunt and then straight to the BusBar.

One of the terminals on each BusBar runs off and connects to the main trailer wiring via the terminals where the previous manufacturer supplied batteries resided and then into the main trailer DC supply disconnect. This minimized the amount of rewiring needed to tie into the existing DC wiring. The positive side leading to the trailer manufacturer dc wiring is fused prior to reaching the existing trailer wiring system.

The existing trailer appears to have ran a frame chassis DC connection from the negative side of the DC wiring. Should I disconnect this and replace it with a larger 4/0 wire from the battery bank bus bar? Is it acceptable to leave it, and run an additional negative wire from the BusBar directly to the chassis(near the existing ground bar on the trailer)? Would/Could this create a ground loop/other situation with multiple DC paths to the chassis ?

Additionally, since the Multiplus requires a ground, should I route that to the negative BusBar, instead of a separate ground out to the chassis, and then use the larger ground noted above? The same applying to the MPPT controller. Similar to this:

https://community.victronenergy.com/questions/25415/installing-the-multiplus-3000.html

In the aforementioned diagram, it would appear all negative and ground connections are terminated on the same negative busbar, and then a single chassis ground is ran to the frame. If that is the more suitable way to approach it, would it be necessary to disconnect the existing DC negative to chassis run the manufacturer installed(I would think so)? How would energizing the inverter chassis with high voltage A/C impact the DC negative connected equipment in the case of a short to the inverter housing using a common busbar scenario(or for that matter into the chassis) ?

I'm trying to determine the most ideal path forward to ensure safety and minimize complexity. The wiring space is extremely constrained as well. Any recommendations are much appreciated.


Thanks in advance for any thoughts.


Chris

chrisk asked
mt_mag edited ·

1 Answer

Can't turn Multiplus on after alarm

I can set the Multiple to on/charger/inverter as I like. I can turn it off as I like. But if I'd had a low voltage alarm, while hooked to shore power, even if I acknowledge the alarm, I can't change the inverter from off to any on/charger/inverter setting.


Can someone let me know the solution?

CaptainPalapa asked
CaptainPalapa answered ·

2 Answers

ESS: Basic Understanding for Factor 1.0 rule and 3 Phase PV Inverter

Hello,

I couldn't find the answer to my question in the forum, so I'd like to ask it here:

I'm talking about an ESS Scenario where I can use Phase 1 as a Backup if the grid fails. (One Multiplus-II between Grid and Phase-1 Loads).

I have a Fronius Symo 5.0 and a Multiplus-II 3000. So I'd like to install 1 phase of my fronius PV on AC-OUT just in case the Grid fails. But as far as I have understood I cannot do that because the PV Inverter delivers 5KW and the Multiplus-II can only handle 3 KW.

But what I do not understand is the following: How does the PV Inverter split the energy delivered from the PV Modules on the 3 phases? And what's the maximum load that's deliverd on one phase? Let's say phase 1 is on AC OUT of the Multi, phase 2 and 3 are on AC In side. So in case of a grid failure: would the PV Inverter put the entire power on phase 1?

So let's say I add a 2nd Multiplus-II. Then Factor 1.0 rule would be OK. Phase 1 and 2 of the PV Inverter would be on AC OUT, Phase 3 on AC IN side. How would the power be deliverd from the PV Inverter in case of a grid failure? Would it deliver all power on Phase 1 and 2?

thanks,

Florian



florianro asked
Rob Duthie edited ·

3 Answers

Multiplus-2 48V PMP

Hallo ich habe einen Multiplus-2 48V PMP Neuinstallation der im Inselbetrieb läuft.Lege ich aber am AC Eingang 220v an schaltet er nach kurzer Zeit ab auf laden. Das Gehäuse habe ich geerdet auch die N und SL sind im 220V Sicherungskasten Geerdet und gebrückt. Was muss ich machen,dass der Multi nicht abschaltet?

cora asked

0 Answers

Victron ESS + ET112 = slow response

Hi,

Recently I've installed ET112 grid meter on my system (which was using CT sensor previously) and I've noticed that the Multi is very slow on response to load. Currently my system looks like this:

[image]

The grid set point is set to -10W. The multi needs a good 15-18 seconds to stabilize after large load kicks in and another approx 15s to stabilize after load drops off. Check the video from VenusGX (the load is switched on at about 16s of the clip and switched of at 43s of the clip):

Is that how it should be? The difference in the load is just about 1.4kW, why is it taking so long to handle that?

Previously I was using CT Sensor extended with Cat5e cable to over 25m long, the system looked like this:

[image]

The response to load was pretty much instant. I've recorder video using the same load as on the previous one (load switched on at about 10s and switched off at 23s of the video):

The system need seconds to stabilize

Also you can see a clear difference on the Grid use graph from VRM portal:

[image]

[image]

As you can see, with CT sensor the system is very close to grid set point, with ET112 grid meter it is way off and hardly ever stay close to set point. The situation is even worst during cloudy day when PV power is fluctuating (you cen see it on my other youtube video).

Is it normal behavior? It looks like Multi can handle this load easily, the problem seems to be in the feedback from the grid meter (or algorithm when ET112 is in use). Is there anything I can do to improve this reaction time??? Please advice.

Kind Regards

Mysik asked
Christian Dorst answered ·

6 Answers

Multiplus II with SmartSolar 250/100 Battery Monitoring

I plan to expand my System(actual setup):

-Multiplus 2 48/5000

-2x Fronius Symo 8.2 (20kWp Gerator Power)

-60kWh battery.

-CCGX


I would like to add 5-6kWp on a SmartSolar 250/100 directly to the battery.


So here the main questions:

Is it possible to monitor the battery still by the Mp II and Smartsolar 250/100 both connected to the CCGX? or is a Smartshunt / Lynx Shunt neccessary?

Michael Schmidt asked

0 Answers

AERL Earth Guard detecting Negative to Ground fault on MultiPlus II 3000/48

Hello,

Installing a ground fault detection device (the AERL EarthGuard) which references PV +, PV- and Ground.

System is 250/100 MPPT, 3 Multi Plus II 3000/48 / 35-32s, Kilowatt Labs 3.55kWh modules x2.

It all works fine, but when I installed the Earth Guard, which was the last thing I did. It detected a fault between ground and negative. Which I've isolated to be coming from the MultiPlus II.

Is there functional negative grounding in the MPIIs? Is there an option to turn this off?

The AERL manufacturer said it could be a faulty unit.

Isaac Shannos asked
Guy Stewart (Victron Community Manager) answered ·

1 Answer

BYD BBox Pro reading 0% SOC on CCGX but 100% on battery

Hi guys


I have a site that has a Multiplus II and CCGX. AC Coupled with an SMA Sunnyboy 5.0 inverter and BYD BBox Pro 13.8Kwh battery.


Everything was working really well up until about a month ago, the CCGX is reading the battery SOC to be 0% but the mulitplus is showing 55v (or 100% SOC) and the BYD battery is also showing 4 full LEDs so full as well.

I have tried resetting the entire system and it does the same thing.

Has anyone had this issue?

[image]

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Ross_SkyEnergy asked
SolarHack edited ·

2 Answers

Multiplus not bulk charging

Hi. I have a new install MP2 3kVA with victron gel batteries (4 x 220AH in series).

I did an initial discharge test down to what the system believed was 70% or 48.9V.

When I cut back power, the charger went straight into float, not bulk.

It has slowly charged back to 85% and is now in storage mode.

Any ideas why it would not have bulk charged?

Should I just run another (longer) discharge cycle and see if it corrects itself?

nickdb asked
Barney9304 commented ·

1 Answer

EasySolar MPPT and Multiplus configuration

Dear community, good night


I wanted to know if the MPPT and Multiplus Inverters incuded in an EasySolar bundle can be configurated remotely via the VRM + Color Control GX.


Thanks for your attention.


Best regards,


Javier.

Javier Moran asked
JohnC answered ·

1 Answer

Multiplus II ESS or Hub assistant configuration issue

Hey everyone I’m hoping you may be able to assist me in the correct configuration. It’s doing my head in trying to get it to work correctly.


I have the following setup.

2kw Solar to 150/85TR Smart solar

Multi-plus II 5000/48/70

Venus GX

500ah battery backup.

8aH load per 24hrs roughly


what I essentially want to achieve is that the solar runs loads and charges batteries to float during the day.

During the evening the load is powered by batteries down to 60%SOC (save capacity for grid outage) then reverts back to AC input to power the load and recharge the batteries to say 75% then the next day when the solar is back it gets the system back to float.


I know that the UPS function works seamlessly from bypass to Invert modes, but does it also work from invert back to bypass without dropping the loads? Is that even possible?


I have tried the ESS assistant and also Hub 1 and even the VS but it just doesn’t seem to work.

Any help would be greatly appreciated


cheers

Tim

TimSHinds asked
TimSHinds answered ·

2 Answers

Firmware update disconnects me when grid goes down

Hi,

I updated from VeBus Fw 408, I have noticed if the grid goes down this takes my inverter out with it I presume this is due to g98/g99 regulations. But however this is a pain for me as I suffer frequent outages and they can be anything from a few seconds up to an house. I am able to disconnect from the grid manually and before I updated I could do this and the inverter still work.

But now I am unable to do so is there a workaround for this? or do I just have to put up with this.

Dale Marriott asked
Jaco Reinecke answered ·

1 Answer

New Multiplus 2000 Inverter/charger fails while heating RV Water heater

My new inverter fails and starts continously while heating a RV Water Heating. Water heater is 120ac and 10 amps. BMV-712 says it's 1700watts, and current is 144amps. SOC is 94 percent when I I turned on my water heater SOC was 100% and Batteries we're at 13.30 charge

I have 2 Battleborn Lifepro4 batteries

Checked all my wiring and double checked.

I have only allowed it to shut down and start 4 times for fear of ruining it.

Keith asked
tmartin000 answered ·

6 Answers

Multiplus II 48v with LG Chem LI

I have been trying to get the MultiPlus to work with the LGBattery with out success all morning.

Following the instructions in the Victron & LGChem whitepaper, I set the VEConfigure ESS assistant and the CGCX.

When I turn on the Multiplus I get an low battery error (the battery is at 51,9V). When I plug in the grid, the charger and bulk lights turn on, but the battery does not charge. I see the grid and the energy needed for the Multiplus comes from the grid, but does not charge the battery.

I am lost on where to go from here.

tieole asked
ejrossouw answered ·

3 Answers

3-phase Multiplus II system, am i thinking right?

[image]

Hello!

i am planning a solarsystem whit 3x VE MultiPlus-II 48/3000/35-32 ( se more in picture) for a 3-phase system.

I have made a simple wiring diagram over how i´m planning to set it up, am i thinking right?

- I want a 3-phase, for example the heating system needs 3-phase to work.

- UPS-funktion of the whole household

- i want to use as much solar energy i can for myself, more optimised for winter then summer.

- not designing the system to be optimised to sell as much power i can. not selling at ALL right now.

- want to use ESS, have lead-acid batties right now, planning to upgrade to lithium a.s.a.p.

- yes a electrician will connect it all.

I was just hoping a "victron-guru" could take a look and see if i´m totaly off or just maybe close to actually thinking right :-)

// Jocke

Jocke_h asked
Jocke_h answered ·

3 Answers

MultiPlus II + Externe PV Inverter + MPPT Solar Charger

Hallo, ich interessiere mich für den Multi Plus. Habe eine kleine 1,2Kw PV Anlage bereits installiert und würde gerne weitere Panele einrichten allerdings über einen Victron MPPT Laderegler ... Ist folgende Topologie möglich ?

Danke vorab bereits für euer Infos...


Gruß

Ibrahim

[image]

Ibrahim Oezyurt asked
stxShadow commented ·

3 Answers

Multiplus II failure due to lizard

Hi Victron staff and community,

I live in rural Central Queensland, Australia. This morning I woke up to find no power. The red light was showing solid on the Multiplus II. I turned off power, isolated the inverter and decided to remove the front cover to see if anything obvious had happened.

So I found, a ghecko (mini lizard) had thrown himself across the transformer secondary tracks on the top of the main PCB. (see photo).

It seems the ventilation holes at the top of the enclosure are quite large and I believe that is the only way he could have got in.

I spoke to my Victron distributor this morning and we established this is not a warranty issue and apparently I'm up for a lot of $$$s for repair. (the main board is quite severely burnt).

The point of my post is to make Victron staff and others aware of what can happen in some parts of the world due to small critters.

I believe a suitable remedy would be to place and secure a fine mesh above the ventilation slot at the top of the enclosure, probably a $5 fix. Well worth it to save a $1700 inverter.

Other than that, I am very impressed with Victron equipment integration and operation, totally gutted at a bit of bad luck and looking forward to getting the unit fixed and back up and running.

[image]

Dave A asked
NigelFXS answered ·

7 Answers

Intermittent “Low Battery on VE.Bus warnings” from Off Grid Multiplus II

Intermittent “Low Battery on VE.Bus warnings” from Off Grid Multiplus II.

All other devices show normal battery voltages on VRM and all connections are physically good. Any ideas?

EcoWorld asked
SolarHack commented ·

0 Answers

Multiplus II not charging in charger mode but will charge batteries in inverter mode. No Leds on in charger mode and not charging with the generator but Leds all good when switched to inverter mode.

Multiplus II not charging 48v battery bank in charger mode but will charge batteries in inverter mode. No Leds on in charger mode and not charging with the generator but Leds all good when switched to inverter mode.

EcoWorld asked
EcoWorld edited ·

2 Answers

Is it possible to get a fault report on a serviced Multiplus II that was exchanged via RMA?

Is it possible to get a fault report from VICTRON ENERGY on a serviced Multiplus II that was exchanged recently via RMA? The excellent support technician at my supplier has left them a while ago so they are not really very technical staff there now and I get cagey vague answers to my questions instead of straight answers.

I now have a replacement unit ready to re-install at a customers place but I have no idea why it failed in the first place so I don't want this new replacement unit to suffer the same fate. We think it may have something to do with DC ripple, so I've greatly increased the DC cable thicknesses but could it be the generator causing the Multiplus II failure? Its charging 5 x Zenaji LTO batteries (www.ecoworld.com.au) and has no AC output connected up. It was in Charger Only mode at the time when it failed. I can supply the serial number if that will help you track it down. This case is not related to my previous post.

EcoWorld asked
EcoWorld commented ·

0 Answers

Building three phase ESS with Multiplus 5kW and Pylontech

Hi,


I am planning to install a ESS system according to the simplified schematic below combining 3 x Multiplus 5000VA for timeshifting energy and occasional backup duty. I hope I have gotten it right!


So my questions are,

1. What is the minimum battery requirement with Pylontech US2000 Plus batteries for this system? The Victron guide on Pylontech only covers off grid use which is more demanding compared to ESS. A breakdown of the requirement would also really help so I can think for myself next time :) Inrush currents have been mentioned before but I cannot find any numbers to base my decision on.

2. Can I add more US2000 Plus modules several years later even if they have different state of health?

3. Can I add other battery types in the same installation?


[image]


Regards,

Sven F

S_Forsberg asked
Guy Stewart (Victron Community Manager) commented ·

4 Answers

Multiplus 12/1600/70 Remote on/off/charger only

Hello all,

Another question regarding the 12/1600/70 Multiplus,

On the spec sheet it stays its Remote on/off options are only "on/Off' with the charger only option missing,

The physical switch on the unit still has all 3,

However i want to use a Victron Digital Multi Control 200/200A with this unit via the VE.BUS Port, and just wondering does that mean the "charger only" option on the DMC will not work at all,? or is the option only not available if you use the physical remote contacts on the unit?

Thanks,

Gregory Cavanagh asked
Gregory Cavanagh commented ·

1 Answer

Multiplus 24/3000 120vac overload thresholds

I have an off grid multiplus 24/3000 120vac in a workshop and frequently trigger overload warnings with motorized tools. The inverter has shut down when a 15a air compressor tried to start (GX shows 1200-1500W when that 15a compressor does run - it doesnt always cause shutdown), but other equally rated tools start/run fine. Of course I understand that the single phase motors can have a high initial power requirement, but it seems that the overload is triggered too often even on much smaller motors. What is the alarm threshold for this inverter, and is it possible to log the short-duration wattage to help plan for and accommodate these tools with a larger inverter? I am surprised that this inverter is not handling the surge. I have run the same tools with a smaller pseudo-sine inverter. Battery bank is 6x 100ah agm batteries with 4/0 cables. No circuit breakers are tripping. AC circuit wiring is 12AWG and inverter/panel connections are 6AWG.


Tojohn asked
RickP edited ·

1 Answer

Victron Multiplus II 48/5000 (noisy) Fan Replacement

Hi all, as per the topic, I own Multiplus II 48/5000/70, with MPPT and a 48V battery bank.

Things are working as expected, so no problems with configuration.

The Fan also switches on when having a load of around above 2kw for more then 30-40 seconds (and I also believe that that is in order). However - I am not confirmable with the noise of the actual fan - the thing is loud and I do know that there are many fans on the market that have different bearings in order to lower the noise.

Can anyone advise if the fan in question is 24V DC or 12V DC and confirm the dimensions (if I'm not mistaken, it should be 120x120x38mm)?

Thanks in advance

Bobby

Bobby asked
bigboy529 answered ·

5 Answers

Multiplus 2 5kW ESS Overload faults LOM?

We have 2x sites both with similar setups that the Multiplus 2 has cut out due to overload in the last two days.

Setup: Multi 2, BYD, Fronius or SMA inverters on AC out.

The overloads have both happened around 5-6 pm(high load on the grid). Both systems have had lowish battery SOC (around 10-15%) due to overcast weather the last week.

What's interesting is that on VRM the AC out power doesn't suggest the multi is overloaded. Which leads me to believe it could be because of LOM. I have looked in VE configure and they are already set to Type B.

Could this be something other than LOM or is there a fix for cutting out due to LOM?

Thanks, Dean

Dean_D asked
Dean_D answered ·

2 Answers

Multiplus 3000 Inverter cycling at 12.5V

I have a new install Multiplus 3000 connected with BMV 712, Venus GX and 860 A/H of 12V AGM batteries. System was working great but at 12.5 Volts, the inverter started flashing low power alram then resetting. I used VE.Configure to set low voltage at 11.5V and 12.5V is the reset point. Why is the inverter cycling at 12.5V and below?

gardnersf asked

0 Answers

Multiplus Ground Relay Voltage

I am troubleshooting the ground relay function. I have two multi plus II’s and an autotransformer. The autotransformer is not bonding neutral to ground when inverting, even though I have the ground relay wiring in the place and the ground relay option unchecked in the multi plus configuration. If I put a multimeter in the ground relay on the multi plus what should I read? Also what voltage range / amps can I supply the auto transformer to force the neutral to PE bond.... trying to isolate the problem....

Fagan1 asked
Yus edited ·

2 Answers

Multiplus 12\3000\120 output frequency 45hz

Just installed a multiplus 12v 3000w to 120AC inverter charger on a boat. I'm using the mk3-USB interface to adjust settings. The inverter output frequency is set to 60hz, but its showing only 45hz on the output. This happens when running off 12v 500ah house battery bank. Please help!

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LOUISE asked
Stefanie commented ·

1 Answer

Mobile alarms for venus and multiplus 2

Are there any tips for the best way to get mobile alerts for an installation, particularly for alerting when grid power is lost and the system starts/stops inverting.

I have created an alarm for ve bus status with a 60s threshold but emailing seems erratic.

nickdb asked

0 Answers

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