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Multiplus-II

Victron minimal setup

hi,

I have 2 eg4 batteries(48v, lifepower4). I plan on buying a multiplus2 48v. Do I need anything else to configure this setup? Assuming I can install the ve-configure sw on pc and connecti without any other adapters in-between?


Couple of other questions:

- I don't think the eg4 batteries can communicate with multiplus as per other threads. Is there any danger of it being overcharged or drained fully

- I plan to charge the batteries at night and discharge during the day. Assuming this is possible with ve-configure

- anything else I need to be aware of?


thank you

rag asked
rag edited ·

4 Answers

Grid and AC loads being combined to give power consumption

It would appear that the power consumption from the grid is being added to the AC loads to give the total KWh consumed, I find this very strange as we have a 12v system too, but when we have been trying to work out our monthly power consumption, we have no idea what it is. obviously the grid power and AC loads will be different as some power from the grid is diverted to power the 12v system and charge the batteries, but I can’t understand why the Grid and AC loads are combined to give a total consumption? Makes no sense at all, as the result would be completely inaccurate. We can see our Grid supply is around 500w and ac loads around 420w (fridge and heating running on 12v) but then the two are combined showing we are using 920w, bur we are now using 920w just 500w, then at the end of the day/week/month it gives a wholly inaccurate reading showing in the region of 500kwh,

is there a way to separate these consumption figures again?

Neil asked
Jason - UK answered ·

1 Answer

Multiplus UK G98 G99 non-compliance update

Dear Victron,

It seems very likely, from the email below (names and some details omitted) that the docs you submitted to ENA in early October will not be sufficient to gain compliance "due to important information being either incorrect or missing altogether".

Please could you provide some kind of timescale for when you will be able to provide updated documents? I note that NGED are, helpfully, willing to liaise with you in order to speed up the process.

Providing a response on this forum would, I'm sure, be very welcome by customers like myself.

Thanks

########

Good afternoon,

I have been asked to contact you, to explain the current compliance status, with regard to ENA EREC G99/1-9, for the Victron Multiplus II 48/5000/70-50 and Victron Multiplus II 48/5000/70-50 GX (which share a common compliance report).

As you may already be aware, as of 1st September 2022, any device that is recognised as an Energy Storage System (ESS) had to meet the full technical requirements of ENA EREC G99/1-8 (and subsequent revisions), where they were previously exempt from some of the newer requirements, that were introduced by the European Network Code: Requirements for Generators (RfG). This requirement was communicated well prior to September 2022, and was published in EREC G98/1-5 and EREC G99/1-7 in August 2021.
Many manufacturers pre-empted this change, and made their ESS compliant before need. Others waited until the deadline to submit renewed compliance documentation.
Where an ESS device had not met the requirements on 1st September 2022, it was marked as ‘non-compliant for new installations’, by WSP, in the ENA’s Type Test Register, and manufacturers were pushed to renew their compliance documentation.

The ENA, WSP and DNOs have the authority to determine Generating Unit compliance under (to name just one document, to avoid confusion) ENA EREC G99, which is an Annex 1 document of The Distribution Code of Great Britain (DCode).
DNOs have a statutory obligation (and licence condition) to abide by the DCode and (in particular) its Annex 1 documents.

As the Victron Multiplus II 48/5000/70-50 (ENA Type Test Register reference: VICEN/02689/V2) Energy Storage Device’s current status is ‘awaiting assessment’, in the ENA’s Type Test Register, I have conducted an in-house assessment, in order to provide our customers with a response sooner than we would be able to if we were to wait for WSP’s assessment. My assessment is based directly upon the requirements within EREC G99/1-9 alongside prior assessments by WSP (what they will be looking for), and my own experience.

I have assessed the Victron Multiplus II 48/5000/70-50 and Victron Multiplus II 48/5000/70-50 GX as being ‘non-compliant’ with ENA EREC G99/1-9, as things currently stand, due to a number of shortfalls in the compliance form. As Victron have made their form publicly accessible, via the ENA’s Type Test Register (i.e. it’s not a restricted document), I believe that I can elaborate upon this:

Advisory and failure points:

[information which could be considered commercially sensitive omitted]

Hopefully, you will be able to see that this compliance status has not come about due to minor inaccuracies, which could be forgiven, but due to important information being either incorrect or missing altogether.

As a consequence of these findings, National Grid cannot accept the connection of the Victron Multiplus II 48/5000/70-50 or Multiplus II 48/5000/70-50 GX, in parallel with our Distribution Networks, until such a time that Victron have provided alternative or additional information that demonstrates compliance with the latest version of ENA EREC G99.

I am comfortable with you informing Victron of the above, either directly or indirectly (through your equipment supplier), so that they may complete and provide alternative or additional evidence of compliance. They should do so primarily to the ENA, but National Grid Electricity Distribution would also be willing to take an early look at any documentation, should Victron see this as desirable.

I am confident that, given time to complete the documents accurately, Victron will be able to make these devices compliant (perhaps with another firmware update) but, unfortunately, we will have to wait until they have demonstrated this before we may accept these on our networks.

Kind regards,

Engineering Policy
nationalgrid

johnone asked
johnone commented ·

14 Answers

DC cabeling and fuses Multiplus II + Pylontech 3000C

Hello,

we are just in final setup and together with my electrician I'm wondering about DC

[image]

fusing and cables.

See picture attached.

- Are 300 A and 100 A ok?

- Are wires diameters fine?

- There are no additional fuses necessary, e.g. for individual batteries?

Thanks in advance for some feedback

David

david35 asked
johnone edited ·

2 Answers

Erroneous Low Battery Alarm

Hello,

Maybe someone can help with this erroneous Battery Low Voltage Alarm I had ?

The datalog file is attached.

The Multiplus2 gave this alarm which caused it to switch from inverter/battery source to grid the other day. When this happened, I measured the voltage at the battery, inverter input terminals etc, and they were all fine. The Multiplus and every other reading in the VRM and through VE.Congif were showing the correct voltages.

So, what caused this alarm?

The smart shunt in the system did not have a SOC at that time due to it being disconnected from power the day before and the battery was not yet at full charge. I say this because I have the Multiplus set to switch from battery to grid if the SOC < 15% and reconnect >35%, which had been working fine. When this alarm happened, the battery SOC was something like 70% or so.

Anyone have a clue here?

Any help is certainly appreciated.

The battery to Multiplus connections are very good, so that's not it.

See the highlighted rows for the alarm starting and ending. I was trying to get the alarm cleared by doing various things in between these times. Also, I'm not sure why the alarm cleared itself. I do see some missing data entries from the shunt.

JDoffgrid_20221203-0950_to_20221203-1249.zip

jonathan-drewes asked
jonathan-drewes edited ·

0 Answers

Node red : Multiplus II primary relay

Dear all,

My installation consists of solar panels, Pylontech batteries, a Multiplus II, and a Solar Charger MPPT 450/100. This set is controlled by a CERBO GX. I have installed Venus Large and Node-RED.

I already control a hot water tank from a CERBO GX relay programmed with Node-RED.

I would also like to program the primary relay of the Multiplus II via Node-RED. I can do this with the Relay Assistant but cannot find it with Node-RED. Do you have an idea?

Jérôme

jeromed asked
wdh2550 answered ·

3 Answers

too many buzzing noise complains coming from Multiplus-II

wow, searching the community there's just too many complains about transformers sound level. Definitely not suited for apartments.. Whats your opinion?

Charlie asked
grobalt commented ·

3 Answers

3-phs machine switching OFF when ESS switches to battery+inverter when grid fails?

One of the best ability the inverters has is to switch off very quick when grid fails, that it's unnoticeable to the loads.

However when our 3-phs MP-ll inverter is connected to the 3-phs machine load, when grid fails it switches off and we have to manually switch it (3-phs machine load) back on again. We have tested with a PC and when grid fails and switches over to inverter the PCs stays on.


Is it because one is a 3-phs and the other a single phase or there's something I'm missing?

Lindsay asked
nickdb answered ·

1 Answer

Décharge et Maintien des batteries en période Hivernale en mode ESS avec Multiplus 2

Bonjour à tous
J'utilise un multiplus 2 en ESS depuis Mars dernier et c'est mon premier Hiver qui arrive.
J'ai une installation photovoltaïque avec des MO et le multiplus ( avec cerbo gx et compteurs ) fonctionne en ESS pour charger les batteries avec le surplus de production et le soir ou en cas de besoin, injecte dans mon réseau à partir des batteries et ce jusqu'au SOC demandé.
J'ai également 2 MPPT Victron de reliés sur les batteries ( 2 petits strings de panneaux récupérés de ma première installation ).
Jusque fin Octobre c'était parfait.
N'ayant en ce moment aucun surplus de production, mes batteries ne se chargent plus chaque jour et ce malgré les 2 MPPT qui je pensais me ramèneraient qq kwh pour charger les batteries, du moins combler la consommation résiduelle du cerbo gx + multiplus.
J'ai un parc de 16,8kWh de batteries pylontech et je perds environ 1% toutes les 10H
Comme précisé dans la documentation du multiplus, dès que le SOC descend de 5% en dessous du SOC de consigne, le multiplus force une recharge pour retrouver le SOC de consigne.
La recharge se déclenche donc n'importe quand ( en heures pleines si je n'ai pas de bol ) et ce malgré des charges programmées actives sur toute la journée pour empêcher la charge ( avec un SOC bien plus bas juste pour que le multiplus ne tape jamais dans les batteries comme indiqué également dans la doc. C'est une petite astuce qui permet de charger avec le surplus et d'éviter que l'ess ne tape dans la batterie même si le SOC est au dessus du SOC de consigne )
J'ai donc le choix de forcer une chargée programmée en heure creuse pour palier à la décharge quotidienne mais j'aurais préféré l'autoriser à décharger plus que les 5% en me disant que dans quelques jours il y aura un peu de soleil et que la batterie se rechargera tranquillement à partir du soleil.
Je perds donc en moyenne 400wh par jour et je trouve que cela fait beaucoup jusque pour le cerbo GX ( qui consomme environ 300ma sous 12V soit et comme la doc le précise environ 5wh . j'en suis loin avec mes 400wh : jour ).
Je loupe peut perte quelque chose mais le maintient des batteries en hiver n'est pas anodin en prenant sur le réseau.
Quel est votre expérience sur le sujet ?
Merci par avance.

s3b asked
s3b commented ·

3 Answers

ESS Multiplus with EM24 slow response also on AC-Out?

Hello,

i am planning for an installation with 3x5kVA Multiplus II with EM24 grid meter and loads on AC-in as well as on AC-out. Like this:

[image]


I came across these threads, where users notice quite slow response to loads, if the ET112 grid meter is installed:

https://community.victronenergy.com/questions/51697/victron-ess-et112-slow-response.html

https://community.victronenergy.com/questions/44996/multiplus-ii-et112-current-transformer.html


I have some questions to this:

One suggested solution was to place the loads behind the Multiplus II at AC-out1 and AC-out2.

OK, thats not a problem. All my loads, that would require fast response would be connected to AC-out anyhow. So.... does it mean, with EM24 connected and set as grid-meter, the loads on AC-in will be handled slower, but the loads on AC-out STILL would be handled fast?


OR.... will all loads be handled slower, once a EM24 grid meter is installed? regardless if connected to AC-out or AC-in??


Some more detail questions:

1. Will the EM24 Ethernet or EM24 RS485 version work better for having faster response? Or is there no difference?

2. Is it better for faster response to have an external Cerbo GX or instead better use a Multiplus II with internal GX?


hope you can help to clarify!

many thanks!!

Peter

pedaaa asked
jay123 commented ·

7 Answers

ESS Inverter response too slow - tripping utility meter

Hello Community,

Our company is struggling with a number of installations in the Tshwane (Pretoria) region of South Africa. The municipality (utility provider) has rolled out the installation of Conlog meters. The majority of these meters are overly sensitive to reverse energy detection. One of the meter models is the Conlog BEC42X (Single Phase).

Many of our installations consist of an ESS setup like the following: MultiPlus II 5kVA, BlueSolar MPPT Charge Controller, Color Control GX, Carlo Gavazzi Energy Meter, BMV700 and a Lithium Battery.

Many of these installations, in the Tshwane area, are experiencing frequent tripping of the Conlog utility meter.

Some forums have indicated that these meters are tripping at a point as low as 20W over 15 seconds - or some 300 Joules of reverse (export) energy detected. This is incredibly sensitive and clearly the root problem. However, this is very difficult to resolve with the municipality (utility provider) and they are mostly unwilling to assist.

We have had to resort to setting the grid set point significantly higher than desired, sometimes around 300W and have had to limit inverter power, in some instances to as low as 750W. With these restrictions placed on the system, we are mostly unable to process (store and discharge) all of the solar energy available from the solar array resulting in compromised economic performance.

What can we do to improve the control of export power to the utility?

It is inevitable that some export energy will be supplied to the utility in a grid-connected ESS system, but one observation that we have made is that the MultiPlus & Quattro inverters appear to react quite slowly AFTER a large load is switched off - this observation comes from the Color Control display panel where we can see the grid import/export as reported by the Carlo Gavazzi Energy meter, as well as the amount of power being discharged by the battery, as reported by the BMV700.

Once a large load is dropped, can the inverter not reduce it's power faster to avoid overshoot and subsequent export energy being supplied to the utility?

From this link, we see that the response time of ESS has been limited to 400W per second as per ESS version 162... but now we need a work around?

This thread comments on a similar aspect: https://community.victronenergy.com/questions/51697/victron-ess-et112-slow-response.html


After reading the above thread, can we not adjust the refresh rate and baud rate for the energy meter (Carlo Gavazzi) to aid the situation in swiftly recognizing the change in the grid import/export condition?

Alternatively, is the 100A:50mA Current Transformer a temporary solution for MultiPlus II ESS installations?


If this cannot be achieved with the ESS assistant, is there a combination of assistants that will allow us to operate in a similar fashion to ESS while overcoming the issues presented by the hard-coded rate limiting?


Thanks in advance for your input and suggestions.


Nicholas Herbst asked
jay123 commented ·

4 Answers

Simple grid connected Quattro 48/10000 and Pylontech battery storage system - No PV

Hi, having taken earlier advice I am now the proud owner of a Quattro 48/10000, 4x Pylontech US5000 batteries circa 19kwh, Cerbo GX, Cerbo GX Touch 50 and this week my electrical supply has switched to EDF GoElectric 35 which gives me 5hrs low rate overnight.

Our house is fully electric and is split economy 7 style.

Night loads such as storage heating/immersion heater being fed from the switched smart meter 5th terminal for 5hrs on low rate overnight. I want to leave this unchanged and is working perfectly.

All other loads are fed from the 24hr smart meter 4th terminal which is both high and low rate depending on the time of the day/night. My EV charger is connected to this and want to continue with this being supplied direct from the grid and not from my batteries, so my understanding is I need to effect changes downstream of this connection.

My simple 24hr use case is

1. Charge batteries overnight during the 5hrs low rate as well as continuing to power all loads. The Quattro 48/10000 invertor is sized to be able to charge my batteries during the 5hrs as long as I keep the batteries above 10degC.

2. When low rate is switched off, use the batteries to power house loads via the Quattro with the grid providing additional power as needed to meet peaks or pick up when the batteries are depleted and awaiting the next overnight charge cycle. By my calcs the quattro / pylontech combination is able to provide circa 4.8kw but will probably limit this to below 3.6kw. My house peaks at circa 8kw on occasion so I will need to draw circa 4.4kw from the grid in addition to the batteries supply for short periods.

I am pretty confident that my purchases can be configured to do all this, but I am struggling to find a definitive way connect everything and was thinking there must be. I do not intend to fit solar due to poor roof orientation.

I would be most grateful if someone can point me in the direction of a detailed diagram that I can use as a starter.

thank you in advance.


netzerodude asked
nickdb commented ·

4 Answers

MultiPlus 12/1600/70 - Inverting Whilst on Shore Power

I have a MultiPlus 12/1600/70.

On the seperate control panel toggling left charges the battery and provides 240v to the 3-pin sockets when connected to shore power. Toggling right Inverts when not on shore power. The middle position is off.

Whenever I am on shore power and do not want to charge the battery I leave the Multiplus off (middle position). The problem I have is that when I want to invert (toggling right) whilst on shore power the unit provides 240v as expected but it also charges the battery (the 'Inverter on' lights up for a few seconds on the right side and then turn off, the left lights on the control panel light up showing 'Mains on' and the current state of charge and the battery begins to charge).

If I can harvest some good solar power during the day I do not want to use the shore power to top up my battery when I need 240v.

I could disconnect shore power to resolve this but is there a setting in Venus or on the Multiplus that would prevent this happening?

mrdean asked
derrick thomas answered ·

1 Answer

Multiplus charger only mode maximum watt transiting through ?

Hi everyone,

I have a small multiplus 500, i was wondering if it is possible to power up a 1000watt tools while charging in charger only mode with the citypower.

I can easily understand why i can’t connect the object without city power but will the multiplus be able to handle the use of the 1000 watt tools if it is just transiting through ac in / ac out ?

Thanks !!

lele asked
nickdb answered ·

1 Answer

ESS or MP2 reducing discharge power at 30% and 20%

Hi all,

I am a bit confused because my MP2 reduces the discharge current at 30% and then again at 20%. I cant recall to have configured something like this.

Environment is MP2 48/5000 + Venus OS + 16s DIY System with JK BMS.

Can anyone point me to a possible source?

dominik-feser asked
nickdb commented ·

2 Answers

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