3-Phase MultiPlus II ESS System with an additional MultiPlus II for battery charging

Dear Victron Fellows,

I have the following use case for two almost identical installations:

On the already existing 3-Phase ESS installation using MultiPlus II Devices, the battery should be charged in case of a grid failure and in time of insufficient PV power.

The installation already has the following devices:

  • 3-Phase ESS installation using 3 MultiPlus II 48/3000 operating in parallel to the public grid (230V)
  • 3-Phase Fronius AC PV converter connected at the critical loads AC Output of the Multis and controlled by frequency shifting (MG50)
  • CCGX
  • BYD B-Box 10.0 connected by VE.CAN to the CCGX
  • MPPT Solar Charger connected by VE.direct to the CCGX

A single phase 5kVA 230V Diesel inverter is available. It should be used to provide the power for the charger.

Is it possible to charge the battery using an additional MultiPlus II connected to the CCGX?

Can the Multi be connected to the CCGX and does it receive the relevant battery information BYD BMS information (DVCC)?

According to the following question it should be possible. And that is what I would expect and I think is the reason of DVCC.

Asking my dealer to verify the answer he told me that it is not be possible to connect the additional Multi to the existing CCGX, because the additional multi would need its own controller and needs to operate independent from the ESS system.

He suggested to connect the Multi by the relays (LINK). This would not be an preferred option for me because I would expect the charging process to be more optimal if it is controlled by the batteries BMS.

If the additional Multi can not be connected to the CCGX, would it be possible to add another Venus device and connect the CAN Bus to this device for retrieving the BMS information?

Best regards,

Martin

martin-m asked
martin-m commented ·

3 Answers

Why is this system not fully charging the batteries from AC PV?

Dear all,


My parents have a new off grid installation in Spain (no grid available where they live). The installation was installed August 8th 2020. I haven't physically been able to and check their installation (due to covid restrictions).

I am not at all a Victron specialist, but have installed my own Solar system, and I am very much into LiFePO4 batteries/ DIY powerwalls / off grid systems in general.


I believe their system isn't working as it should, based on my experience, and therefore I started to study the parts used in their installation in order to help them find the problem (because the installer treats my parents as retired old people and says everything is working as it should). But, wait...


The parts:

* 39 solar panels:

- 12 280W panels connected to Victron MPPT150|60-TR Bluesolar charge controller

- 27 280W panels connected to a 5kW SMA sunny boy (sb5.0-1av-41 905). I don't know how the sunny boy is connected to the system. It's an "on grid" invertor according to SMA (= grid tie), therefore it would suffice to connect the SMA AC to the juntion box and it should regulate/synchronize it's output wave based on the Quattro AC (i suppose that the Quattro will act as the "grid").

* Quattro 48/10000/140-2x100

* 6 x 2.4kWh = 14,4kWh pylontech pack of batteries, good stuf

* Venus GX


The dashboard, at the moment, looks like this:

[image]



Facts/problems:


* Let's say that it's 1400hrs, the sun is shining bright, and the batteries are @ 60% and charging. Then, all of a sudden, the SMA stops putting electricity on the "grid". Often, the SMA sunny boy stops working for say 1 or 2 hours, losing critical energy in the winter and the end result is a battery that is say 80% charged instead of 100% at the end of the day.

So I checked out the statistics @ the moments that this type of scenario takes place (almost every day), check this out:


My father notices, for example December 13 (but this happens every day) that the Sunny Boy isn't putting power to the grid (He checks the Victron dashboard regularly, so he notices this quite soon), and he let's me know. So I start digging... And I notice this:

I notice that there are gaps in the production of the sunny boy.

[image]


I check the SMA error page, and at the moments that there are gaps in the production, I get frequency related errors:

[image]


So I go the the VRM-app, and dig into the frequency statistics:

[image]


To me it's clear that something is causing ripples in the AC frequency (from for example 11AM-> 1300hrs, 53Hz, which isn't just a ripple).


My parents state that their bulbs start flickering, change brightness when these peaks/gaps occur.


* Initialy the installer installed a 6KW SAJ invertor, but this invertor got so terribly hot, that after a week or 2 it died. The installer then replaced the SAJ with a 5kW Sunny Boy. I told him (through my parents, I didn't actually get to talk to the installer) to install a 6kW invertor, because my parents paid for a 6kW, and 27 panels in Spain cán in fact generate more that 5kW. But the installer said that that is non sense, a 5kW was just fine.

-> What the F*c#??


* The installer installed a 3-way switch for 'solar system', "off" and "generator".

[image]

When my dad connected the generator and sets the switch to generator, all lights inside the house started to shine brighter, a couple of LED-stripts/bulbs "exploded", and the quattro started clicking like a maniac (must be relays trying their best to regulate something).

i believe they miswired the generator connection to the system. I think that my dad is putting 220V onto the system (with the generator), but the quattro is the master, not a grid tie invertor. Therefore the quattro doesn't synchronise it's 220V with the generators. The result is, I believe, constructive and destructive interference and as a result the bulbs exploded due to the AC peaks.

Does this seem likely to be the cause/what's happening?



What my parents want:

* to have as much and as stable of a 220V system as possible

* to have the invertors charge the batteries as fast as possible, without devices stalling for no reason (because the loose precious daylight in the mean time)

* to be able to connect my parents 6KW generator to the system to power the house and charge batteries in dark weeks without a lot of solar power;


That's it, and that's what's promised by the installer.



Please give my your thoughts. I'm watching all that is to be watched on YouTube, reading datasheets, etc. but actual help/opinions of guys witch real Victron knowledge would be invaluable.


Thanks in advance.







hdb asked
marekp edited ·

6 Answers

Synchronize VE.Bus SOC with battery? Select on loss of communication source for genset

Synchronize VE.Bus SOC with battery

Has this item been rolled into dvcc? After some digging here it seems its been removed yet its still in the manual. The last mention of it in the changelog is in the v2.02 – 30 January 2017 Venus Os

Are you guys working on an update to the manual to remove redundant settings to avoid confusion?


loss of communication source for genset

I have a few systems I setup and support with auto start gensets, after a couple of weeks of bad weather one went into LVD during a sustained load at a low SOC. Voltage start timing settings were a bit too long to catch the voltage crash. LA batteries.

I had set start on loss of communication as a third fail safe to start the genset, and had the BMV as the source for genset SOC. However the genset didn't start as the BMV was still active yet the multi had shutdown. I had assumed that it would start on loss of comms to anything on the VE.bus. After rereading the manual, it's loss of communication to the SOC source.

Normally I disable the battery monitor in the multi to avoid the user accidentally changing the source.

I have now reenabled the monitor in the multi, which seems to be tracking the BMV and set the genset SOC source to the multi.

However Synchronize VE.Bus SOC with battery is completely missing so the only indication the SOC is being read by the BMV to the system is that its the same as the BMV.


Seems a rather complicated method, could we simply have this changed so we could select the loss of communication source?


This now raised another question, when performing remote configs through the portal the multi/quattro drops communications to the venus device for a moment. Will this cause a genset start?


alan asked
JohnC commented ·

1 Answer

Is there any setting for soft start gradual battery Charging?

Hi.

I would like to program the inverters to charge the batteries gradually for the first few minutes. As default the Victron Quattros starts to charge the batteries at full power straight away and on big systems this can put strain on diesel generators. Is there any way to do this?

Jesus Mazo asked
Jesus Mazo commented ·

1 Answer

Quattro - utility and generator + ess

Hi All,

I am installing a small system 16x385w jinko mono + 2 x Smart Solar 250/85 MPPT + 1 x 8kVA Quattro + 2 x Solar MD SS4074 batteries

I would like to install the 8kVA Quattro - with 2 inputs - 1 x utility and 1 x generator, and run ESS, not to feed back into the grid, just to maximise the use of the solar.

The generator will auto start/stop with assistant on quatrro.

i have heard it is better to connect the generator feed to input 1 and utility feed to input 2 - how will this affect the ESS?

Looking for advice on this setup.


thanks

Alex Rodgers asked

0 Answers

[Solved] Honda eu10i not syncing to multiplus (revised: no generator syncing)

Hello,


I have hooked up a new Honda eu10i generator to an EasySolar 3000. The CCGX identifies the generator is there, but will not accept any charge. It attempts to sync with a click, but disconnects instantly. Current limit is set to 5A, but it doesn't even get that far to load the generator.


[image]


I have tried all of the settings in the generator faq; weak ac, UPS disabled, etc.. but have not had any luck.


Current non working config is attached;

a0f6fd5aa8b8_inst_ttyO1_Interfaces_Mk2_Tunnel(1).rvsc.zip


Any help would be great!


Thanks,

Zooka.





zooka asked
zooka edited ·

8 Answers

Connecting an Intellisense Nano Generator controller to a Multiplus 2

Does someone know which relay connections are to be used to connect a Pramac Intellisense Nano controller to my Multiplus 2.
‘Thanks Rob.

rob-townsend asked
markus commented ·

2 Answers

Noisy Multiplus

Hi there, I'm running a Hyundai 6kw ats generator through my multiplus 3000, I'm getting around 1600w coming through, all runs fine accept a loud vibrating noise coming from the centre of the multiplus. The question is should I be concerned by the noise, it's not a normal inverter noise more like zapping sound and also sounds like a neighbour is using a drill on the otherside of the wall?
Any help would be appreciated.
Thanks

leongallienne asked
alan edited ·

5 Answers

Set generator as running when AC1 is active.

Hi folks,

I have AC1 set as generator input and it works as expected, bar for a limit addressed on another post.

I would like to track generator run hours but I do not have auto start set up yet as this involves a modification of the generator.

I currently start and stop the gen manually, which works for me right now, and would like AC1 to set the generator start and stop flag which would then log run hours for me.

I apriciate that its litterally the reverse of what would typically be required.

Is this possible? If not is there any way to build and run a script to make it possible? Could I build a custom helper of example. or is there perhaps a helper that runs script?

Multypluss 48/5000/70 & CCGX.

Cheers,

Al

Alistair Warburton asked
alan edited ·

4 Answers

Genset idetified as GPS in VRM

I have a Honda genset connected to a Cerbo on digital input 1 to detect run status.

In the VRM portal, under Device List it seems to be detected as a NMEA GPS. It also is reported as being running, allthough it is off. Any clues to where the mismatch occurs and solutions?

[image]

ivar asked
ivar commented ·

1 Answer

Multiplus-II ESS with Genset and ATS

I've got a Multiplus II 48/5000, and am planning to install a second Multi, with capacity to bring all of the loads onto the ESS. At the same time, finishing installing a 1500rpm generator that is connected via an automatic transfer switch with the grid connection.

My objective is to use the ESS as a buffer for when the AC loads exceed the capacity of the grid, and then switch to the generator. This is both during a power outage (loss of mains) or when there simply is not sufficient power available from the grid (which routinely occurs in the winter months). The generator is sized sufficiently to power all of the AC loads, as well as provide capacity to charge the batteries.

What is the best method for connecting to and/or monitoring the ATS and generator, so that the GX can call for the generator to start/stop, and to not backfeed from the Multis to the genset? Or, do I need to control the ATS and genset externally from the GX?


maronism asked
Rob Duthie answered ·

1 Answer

AC-IN RCD tripping when Quattro connects starts using it.

Hi!

Hoping to get some insights on this because it is very odd.

The ACin-1 of my Victron Quattro 15000VA it is connected to the mains but with an RCD to protect about 15meters of cable that is from main SwitchBoard to the Victron. In this case as soon as Victron internal switch makes the contact (click noise inside Victron) the RCD trips on the switchboard. I have tried to put a Type A just in case that would fix it but trips as well...

When I connect direct without RCD, all works perfect, Victron works as UPS and no issues in the supply.

Any insights?

Thanks a lot!

JSJC asked
JSJC commented ·

0 Answers

Open AC-input relais in ESS mode on MultiPlus-II

Is there a way to open the AC-input relais on MultiPlus-II by a command submitted to GX-device or with an input signal on MultiPlus-II when using ESS- instead of a virtual switch application? I would like to avoid placing an additional motor-switch or relais in between grid and MultiPlus device.

Thanks
Thomas

thomasw-1 asked
thomasw-1 commented ·

1 Answer

Can Quattro start a generator like a car - off/on/start-momentary ?

We will be installing a Quattro 48V/10K sometime soon, and would like to have it autostart a small Duromax XP12000EH generator. That generator uses a typical car-like starting system, with a keyswitch (that I'll tap into) that has Off/On/Start-momentary. Looks like this

[image]

  • Off : two sets of wires are jumped. Easy enough to do with an extra double-pole relay. These ground out the coil, and open the fuel solenoid.
  • On : nothing is connected.
  • Start : Just like a car, momentary jump of two wires until gen is running, maybe 2-3 secs

I see lots of posts about using special generator control modules ($$) or timed relays etc. There must a way to use the programmable relay assistants to handle this. @Mark gave a really nice description in

https://community.victronenergy.com/questions/41930/venus-disconnect-ac-in-1-when-generator-signal-is.html

that it should be possible using two relays, programmable primary, and secondary K1. (I want to use K2 for a vent fan in the battery box ...)

The logic would look something like this I think :

Quattro determines that gen should start (battery SOC/Volts AND no grid AC)

  • Close primary relay. Hold in this condition as long as gen should run.
  • Wait 1 second
  • Close K1 relay
  • Wait 3 seconds
  • Open K1 relay

Quattro determines that gen should stop (battery SOC/Volts OR grid AC good)

  • Open main relay

How could we implement this with Assistants etc ?

halfwalker asked
alan answered ·

5 Answers

AUTO GEN START for Cerbo GX with GX Touch Screen

Can someone help with how to design / make the auto gen start feature work with the above equipment? I'm replacing a Xantrex AGS connected to a Cummins 6KW gas generator. A diagram of the current system wiring is attached. I don't think it's difficult but I can't figure out how to do it. Thanks in advance!

[image]


glenn2387 asked
harold answered ·

2 Answers

Load on AC-Input exceeds the limit under certain conditions, causing my generator to cut off

At my summerhouse I have an off-grid setup with MultiPlus II 48 | 3000 | 35-32, 600W Solar panels, 2 x 4 LiFePo4 batteries (12V and 100Ah each) and a true sine inverter generator with capacity 1600W (240V x 6,67A). I have set a limit on the AC-Input to 6.0A to avoid overload on the generator. But still I experience that the generator is overloaded and cuts off. Of course, this happens most frequently when there ar sudden increases in the load when the generator runs and are swithched through, e.g. when we are running a washing machine. But it also happens when the load variations are minor: Changes in the size of 100W or even smaller can trigger such overload.

I expected that setting the limit on AC-Input would protect effectively against overloading the generator. With that limit set to 6.0A, I rarely see a load higher than 1300W from the generator in the Remote Console on LAN. It seems as if MultiPlus adds a margin to the limit an makes it even 10% lower, i.e 5.4A = 1296W in my case. I have even tried to set the margin to 4.0A, but still I experiences that the generator cuts off due to overloading, although more rarely. This is quite annoying as we can't trust that the generator supplies power to the system. We have to inspect the monitors and restart the generator many times if we try to use it when the load is not completely stable.

My question: How can I deal with this problem?

tvidvei asked
JohnC commented ·

2 Answers

How to set up a Manual Start Gen on the Multiplus ll, no AGS available ATM

I have a newly Self installed 48v 5kVA system, we are seasoned "off gridders " but new to the Victron equipment.

Color Control GX connected to the VRM, I have the GX Control 3 app able to make changes if settings are given

Smart Solar MPPT 150/60

Multiplus 48/5000/70-50

100 Ah Lifepo4 Batteries ( these are temporary till we make a decision on batteries)

5 KVA Generator Hatz Diesel Manual Start 230v

bluspark asked
JohnC answered ·

4 Answers

Canbus Enabled generators

A lot of generators now are starting to come with Canbus enabled controllers, for instance the DSE4520.

Will you be extending your canbus generator abilities past the Fischer Panda?

If you made it compatible with the DSE you would cover a lot of gensets as many brands utilise this genset controller.

alan asked
Paul B answered ·

1 Answer

ESS system with Generator on AC input 2 and Quattro 5kva is not stable

Good day all .

I have a victron quattro 5kva setup with a mppt 250/100 and 10kwh of lithium batteries. Ac input 1 has mains electricity. Ac input 2 has generator input. Now with out the ess assistant geneator charges batteries and supplies loads through the inverter with no issues .

When i enable ess assistant the system functions with solar and grid energy as required. However should the user require generator to backup power or charge the battery the inverter will constantly flip on and off between charge and not charging . The relays will stay on for about 2 mins and off . Then on again then off again. To try all options we have disabled ups mode. And enabled weak ac input. This still doesn't make a difference. I can only assume that this has something to do with grid feed in which is set to grid type other with no feed in . Loss of mains on both ac input 1 and 2 is set to type b safe .

Would changing the type b to disabled on the ac input 2 correct this problem with no adverse effects on the 14kva generator input 2 ??

Or should i be looking for another solution .Thank you in advance for your help and assistance.

nismoboy34 asked
Daniël Boekel (Victron Energy Staff) commented ·

2 Answers

Multipass 24/3000 shuts down when disconnected from shore power

My Multipass 24/3000 was installed this past summer. Everything has been great until two weeks ago.

Recently, I went to use my boat and after unplugging from shore power, engines start etc. I noticed the breaker for the inverter was not illuminated, but the breaker was on and had not tripped. Before starting the boat, AC/DC panel showed inverter breaker operating and illuminated. The inverter is left in charge only when connected to shore. The color control GX showed no alarms or issues.

With the engines operating the port side steering was not functioning but starboard size was. (Boat uses jet drives with buckets and joystick steering). After a few minutes trying to trouble shoot, I started the generator and then the breaker switch for the inverter became illuminated and now both port and starboard steering began to work.

The alternators on both engine were replaced during the Multipass install and everything had been working without issue.

Summary: the Multipass 24/3000 only is working when connected to shore power or receiving generator power source. It does not work when the engine is running.

What am I missing that may cause this?



talaria asked
talaria answered ·

2 Answers

Switch as a Group (3ph. system, input 1)

Hi all,

it seems to me the feature "Switch as Group", in the VE.Bus Configurator, is a bit under-documented .

So, please verify, in a three phase system with Quattros in all phases (at input 1), when "Switch as Group" is not checked, does it affect all the Quattros ? ..... meaning that any of the three, and any number of them, can operate as inverter or charger independently?
In that case, one or two units, could operate with the ""Power Assist" feature, while the remaining one (s) can operate as charger.

Thanks.

Nikolas Stathis asked

0 Answers

Balanced generator currents in Three phase off grid system with Quattros

Hello all,

we are designing an Off-Grid solar system upgrade due to higher power demand.

The system now consists of :

1xQuattro, 1xGen (wired as single phase), 2x PVstrings, 2xMPPT, 1xBattery String

After the upgrade :

3xQuattro, 1xGen (wired as three phase), 4x PVstrings, 4xMPPT, 2xBattery String

The upgrade system will be controlled and monitored by a GX control unit (Cerbo-GX).

The generator is used as a backup power source, to feed the loads and charge the battery string, and it will be rewired back to three phase to gain some power lost by the single phase wiring.

The loads are single phase ones, and will be evenly distributed to the three phases by their nominal power, but the actual power distribution depends on the customer usage, and time/day.

My concern is the balance of the generator currents when the loads are not balanced.

So, is it possible with the Quattros to equalize / balance the three AC input currents (from the generator) while feeding loads on their outputs?


In the book "Energy Unlimited"

https://www.victronenergy.com/upload/documents/Book-Energy-Unlimited-EN.pdf

page 67, example 12.3.2, we can see the statement :

"One attractive feature of the Multi’s is that they will automatically balance the load of the generator: the Multi’s will take most power from the phase(s) which otherwise would have the smallest load."



What is saying there ?

(is this the feature I am looking for, or I am reading what I would like to read, is this possible with the Quattros?)


Thanks


Nikolas Stathis asked
Nikolas Stathis answered ·

2 Answers

Power quality, from generator, limiting charge... Solutions?

I just closed a thread 'Bat temp OK, charge still limmited...?'

Here which is a preamble to this one.

I have now identified two issues I need to understand / fix

a. The weal AC setting is applying a 2kW charge limit and I dont know why.

b. My generator will not stay connected when weak AC is off and I need to understand specifficall what limits are being checked so I can fix this.

Given that I do not know what aspects of the AC are being checked or what limits are in play I dont know what to try and fix.
I am fairly confident tht the power quality problem is my generator, as opposed to the charger being fessy, but there is some sort of interaction between the two that upsets both.

I have added some chokes to L & N respectively which have helped considderably but not fixed the issue. Adding a comon made choke didnt help.

However I do not know the value of the unts as they are hand wound on scrounged up cores. I do know the value is importent and would be based on what exactly I am trying to fix. Thus not knowing either is a big issue.

Depending on the core periability, unknown, the two I have connected are likely to be between 4 & 12 mH and as they are green epoxy I suspect 12.

I am clearly on the right track but what I have is at best a bodge and at worst could do dammage. I need to find / design a solution propperly and to do that I need to understand precisly what needs fixing.

For now Weak AC will be going back on.


I need to know the switching frequency of the charger.
I need to know what AC waveform artifacts are considdered Poor.
I need to find out / work out what value of choke is likely to work best.
I need to know if a small bypass capacitor, probably between chokes, will help and if so decide on a value.

I am also aware that what I have done may not be a good way to go in the first place and I would be interested in anything anyone can suggest with respect to the problem in general.

Given that there is a charger setting designed to counter poor power quality from generators I am assuming it is relativly common issue.
If the built in solution wasn't hobbling my charge rate I wouldnt be asking about waveforms and chokes...

My goal is to get to the full 70A DC, which is around 3.5kW, and well within what the generator can supply with losses and power factor taken into considderation.

Any and all help or advice would be very much apriciated...

Cheers

Al


Alistair Warburton asked
Alistair Warburton commented ·

0 Answers

Why did my Quattro go into Overload?

Hi,

Today my 3-phase parallel Quattro system came to a halt due to L3 whent into Overload alarm.
I was running my genset (grid was connected aswell) who has priority, and is programmed to stop at 80% SoC. Venus GX relay opened and sent a signal to my genset to stop, my genset then runs for 5 extra minutes to cool down, still supplying voltage/current though.
When the genset does shutdown, then came the overload alarm.

I have gone through the excelsheet from the VRM portal and i have my suspicions on what caused it, but would like your opinion on the subject. The excel sheet is attached.

Why is the AC-In relay not triggered when the Venus genset-relay opens (signaling genset to stop)? That would send the quattros to inverter mode, and shortly after phasing in to the grid, into grid mode.

That would then actually let the genset cool down for 5minutes without any load, before it shuts down.


Kind Regards
L230


L230_20201113.zip

ehsab asked
ehsab edited ·

2 Answers

Generator not charging batteries

I have a 5kVA Quattro, running ESS. AC1 in is Grid, AC2 in is Generator.


My challenge is that in the event of a grid failure and if my batteries are low and my generator is running, it does not charge my batteries (or shall I rather say it limits current drawn from the generator to around 8A). AC is synced. Current limit on AC2 is set to 15A.


If I do increase required output power, it draws the additional power from the generator until it reaches the 15A mark. So my issue is the fact that it does not use available generator power to charge my batteries.


This use to work. No idea why it stopped

jleroux asked
jleroux commented ·

1 Answer

Unexpected relay behaviour - Multiplus 48/500 controlling generator switching on/off at minimum run duration

Hi, very confused, appreciate any views...

have a Multipus 48/5000 configured to close relay to start generator at defined SOC. Which it does.


However rather than running until SOC condition met, it runs for the configured "Minimum Run Time", stops, then 2 or 3 minutes later starts again...and so on until the SOC condition is met.

Maybe I have misunderstood, but I expected the "Minimum Run Time" to set a lower run limit in case the condition which initiated the start was resolved faster? Not to turn off the relay after that time, then re-assess all the conditions again?

Thanks!

energetic61 asked
energetic61 answered ·

2 Answers

48v vs 24v off-grid US

Hello all. Looking for advice as I build my off-grid system for my tiny home. My current dilemma is that my batteries can be configured as 24v or 48v systems, and not many of the 48v systems are configured directly for US, split phase.

Option 1 is use the batteries at 24v and use an inverter/charger(quattro probably), adding a second unit for split phase in the near future.

Option 2 would be use the batteries at 48v, with a EU inverter/charger run it at 240v, plus an autotransformer.

Is having a 48v system worthwhile in terms of longevity and efficiency to justify the slightly more complicated system? I'm also not sure how I could charge my pack with a 120v inverter generator through a 240v configured inverter, when I need generator backup. I like the idea of having the autotransformer in the long term anyway to balance loads for split phase when I use tools, but the AC charging from a generator is the biggest unknown to me right now.


bdale asked
mt-geek answered ·

1 Answer

Generator shuts down when charging

New problem - just started this week.

I have a victron 3000 and a Honda generator 2200.

When I turn “charge on” or “on” it turns off generator.

What can I do to fix this? I have never opened up the victron since it was installed. I’m new at all this.

Thanks for any advice

David

davidnepove asked
chrisb13 answered ·

3 Answers

Generator size and harmonics (THD)

Greetings,


I would like to know what is the minimum size of generator that can work without problems with a Victron Multiplus 48/5000/70.

I know the following link:

https://www.victronenergy.com/live/multiplus_faq#generator_sizing

in which it is recommended that the minimum power be 8 kVA, but below the data table it is indicated that """if your generator is smaller than the recommended size for your inverter/charger, you will definitely need to adjust the settings ...""". From this, I can deduce that a smaller generator can work properly.

I cannot find the minimum value from which the system will work correctly.

On the other hand, I can choose between two generators: one with a THD<5% and the other with a THD slightly greater than 7%. (There are other features to consider, of course)

Is there some recommended maximum level of Total Harmonic Distortion?

Thank you for your attention.


guillem-636 asked
JohnC answered ·

1 Answer

Can I connect a generator to the output of the Multi?

I have a system made up of 2 Multiplus 5000/24 connected in series. And I want to connect a generator (75Kv / 220) to charge batteries and supply electricity to the system. An installer has told me that if I connect the generator output cables directly to the 220v output of the Multiplus 5000/24 Master (Taking special care to connect L in L and N in N) the Multiplus 5000/24 Master will automatically recognize the generator input when it is running and will act automatically in less than a second without the need for a changeover installed, working like main surce and battery charger at same time without the need to switch the button "Charger" on third swistch position on Multiplus main panel, Is it true? Personally I think that with this method it can be more practical, but also when connecting it to the 220v Multiplus outlet. when the generator is stopped I can send 220v from the Multiplus to the generator and I do not know the consequences of this.

earomi asked
yann answered ·

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