EM540 grid meter?

Hello,

i read some about the new EM540 grid meter. This should be supported by newst Victron Software.

And also it should be a improvement against EM24, for example because of faster Modbus Update rate.


It seems, that only 2 versions of this meter are supported:

  • EM540DINAV23XS1PFC
  • EM540DINAV23XS1X


Does anyone know the difference?

Are there any downsides in using this new meter?

I ask, because my plan was to install the EM24 RS485 next week. But if the EM540 is much better, i will switch to the new meter before installing.

pedaaa asked
pedaaa answered ·

2 Answers

Firmware update 2609486 for MultiPlus 12/3000/230-16

Is it just happening for me, or is there a bug in the latest firmware for MultiPlus?
I just updated it, I think it’s only the name because I can see the inverter still says 230V.

But according to VRM and GX Devices, it’s now a MultiPlus 12/3000/120-16.


[image]


[image]


sebastian-w asked
diromobil commented ·

7 Answers

Pv array strings voltage drop when combined

My PV array series strings are 6 panels long, there are 5 strings. Each panel in the string is 100watt 20volt, 6.25 amp.

The voltage of each string before connecting to the combiner box is 108 volts in full sun 80% (great) but after connecting any of two strings together the voltage drops to 90 volts.

Being new to solar thought I should ask if this is normal or do I have a problem?

waynec asked
waynec answered ·

5 Answers

Multiplus charge current control? assistant/ESS

Hi Folks... This is going to raise a few eyebrows I expect but none the less...

I have two Multi's 5000/48/70-100 and 5000/24/70-100.

They are connected in series, as in, the output of the 48 feeds the input of the 24. I have done this to take advantage of the assist feature, giving me more overall output whilst retaining the ability to use either system independently, external manual changeover switch, in the event that either system has an issue or needs to be switched off for maintenance/modification.

My solar is DC coupled to the 48 system and managed by the BYD battery ( Standard config :-) )

We are completely off grid so my system needs to be as fault tolerant as possible.

The configuration works well, AC input limit on the 24 protects 48 and can be used to determine which battery is actually supplying my loads, assuming that the load is les than 4kW at the time and I anticipate using charge current limit, dynamically, on the 24 to determine the balance of available charge current between the batteries.

However...
I discovered that I cant directly connect both Multi's to the same VE.Bus as they immediately try to go parallel which isn't the goal and as far as I know would not work anyway.
I have connected the 24 to my CCGX via an MK3, which seems to work locally and within VRM.I
(I cant access the registers on the 24 via Modbus but that is a different question.)

I need to control the charge current limit and am aware that there is an assistant which I think will allow me to do so with an analogue input or potentially 1 or more digital in's

I am also aware that ESS is replacing this kind of functionality and was wondering if treating the 48 as a grid and running ESS on the 24 is possible and if it is weather it would be a better, more integrated, approach.

Questions In summery...

1) What options do I have for managing charge current limit remotely/externally?

2) Is ESS an option?

3) Is it possible to handle the second Multi, 24, as an AC coupled charger for the first Multi, 48, like AC solar?
In an ideal scenario it would be good to be able to cross feed energy in either direction and manage where available charge is going, as a system.

4) Is there a GX variant that will allow both Multis to be directly connected, so I have full access to parameters and remote config, whilst keeping the two systems from trying to parallel up?

Sorry this is a bit long, I wanted to provide an accurate context.

Cheers,
Al

Alistair Warburton asked
Alistair Warburton edited ·

3 Answers

MultiPlus-II GX with Daly BMS and CAN-Bus connection

Hello, I would like to build an 16S 48V LiFePO4 battery pack with 280Ah EVE cells and 200A Daly BMS with CAN-Port. As inverter I decided for an MultiPlus-II 48/3000/35-32 GX. I asked the Daly support if the BMS will communicate with the Victron MultiPlus-II GX and they confirmed. In an other thread sombode wrote that the Daly BMS will not communicte by CAN-Bus with the Victron Multiplus II GX. Does anybody has experience with the Daly BMS and if it works by CAN-Connetion out of the box with the Victron devices?

gero asked
wkirby commented ·

4 Answers

Feature request: Allow Multiplus to be switched on&off from the VRM Dashboard

Hi there,


I'm using - and loving - the VRM portal, live controlling my installation (the new layout is great).

As I must spare any lost watt, I'm often switching on&off my multiplus C. Somebody knows if, in the future, it would be possible doing it directly on the main page, without opening the console?

That would be awesome !

Best

Denis


[image]

denis70 asked
denis70 commented ·

8 Answers

Unexpected discharge, float not reached

Hi


I am observing the systemn how here and there and I noticed that the "float" state is never reached. It seems to move between "charging", "absorption" and then "discharge". Below you see that excess energy is feed to the grid, but still the battery discharges - if not much, but it does. Is that some configuation issue? I would have expected the battery (pylontech US2000C - 8 units) to float.


[image]

sesshoumaru asked
seb71 commented ·

1 Answer

2 Unterschiedliche Akkus am Multiplus

Hi,

ich betreibe derzeit an meinem Multiplus zwei US3000C Akkus und würde das System nun um zwei Tesla Akkus mit entsprechenden BMS erweitern.

Kann ich diese ohne weiteres parallel betreiben ?


Gruß

David

davidfg asked
davidfg commented ·

2 Answers

multiplus and pylontech without PV and MPPT

Hi.

I want to use a Multiplus and some pylontech US3000C batteries without any PV attached (kinda like a UPS for the whole house with the batteries charged from the grid, when available).

I've read this page on the victron site and I thought that all I needed was the multiplus and a cerbo. But then on this pylontech pdf Compatibility List US5000.pdf I saw that there is double asterisk after "off-grid" on the two lines for the multiplus and quattro.

And, as you can see, the note attached to the double asterisk says

"When compatible with Victron Multi/Quattro in off-grid application via venus-device, it is required to have a victron MPPT or other compatible PV inverter with victron to avoid the system getting shut down"

That pdf was last updated on 15/6/2021, so it's not that old.

So, is that correct? Do I actually need an MPPT to use a multiplus as an ups?

Thanks

jterrag asked
jterrag commented ·

5 Answers

Multiplus II + ESS + Power Assist not working as I expect when minimum SOC is reached.

Hi all,

So i'm running into a bit of a issue with the behavior of the system. I'm pretty sure this is intended but still wanted to ask for options.


Little introduction

I have a 3 Phase system setup (3x Multiplus II) backed by 30kwh lifepo4 batteries which are charged by the MPPT RS inverter. I'm using a EM24 to measure grid power even though my whole house is behind the victron installation.

My grid connection is 3x25A and one of the goals of getting this system is to not have to upgrade to a 3x40A connection which would cost me 700 euros a year. My house is fully electric (no gas connection), electric cooking, electric heating, electric car, heatpump for pool.

This means I have a lot of consumers that if turned on at the same time can trip the breakers. Since i sell power to the grid for 1:1 (untill 2025), the main reasons for the system was 1: UPS functionality, 2: saves 700 euros a year on a higher grid connection bill. 3: Was building a new house, so it was the perfect time to get all the wiring in and 4: Being ready for when i no longer sell to the grid at 100% rate.


The issue

I'm generally running a 75% Minimum SoC with a 0W Grid set point. Excess PV is delivered to the grid. Usually in the evening it reaches the minimum SoC. Once it reaches the minimum SoC it seems like input current limit is completely ignored. This means if when the minimum SoC is reached, my breakers can trip when multiple loads are on at the same time.

In my opinion, the input current limit should always be respected, almost as a same priority as grid failure (Since it in 99% of cases leads to grid failure, why else would you configure a input current limit).

The expected behavior for me would be that if a peak load needs to take from the batteries below the minimum state of charge on 1 or multiple phases. It starts assisting on the phases that require it. If there are phases available that have extra capacity left, it can convert AC to DC to supplement the DC requirement for the peak shaving phase. If this is not sufficient (maybe all phases are overloaded) it can take energy from the battery beyond the minimum SoC. Since if it does not do so, theres a risk the grid goes down and having to take from batteries regardless. After the peak load is gone it could top up the batteries back to the minimum state of charge using the grid (not beyond). Since I want the DC coupled solar only to top the battery up to 100% minimizing inverter losses.

Ideally, i'd want to have a minimum SoC for self consumption and a second minimum SoC for power assist to minimise inverter losses. E.g. discharge to 75% for self consumption, then discharge to 50% for peak shaving. If battery is at 50%, still allow peak shaving however when possible use grid to charge back to 50%.

Is what i'm experiencing intended?

Does anyone have any advice or recomendations?

Marco Nijholt asked
lifeingalicia commented ·

0 Answers

BMV 712 and 24V DC / 120V AC Quattro with Cerbo GX

We have a 24V DC Quattro 120-120V AC Inverter/Charger and want to be able to shut off charging from the Quattro to the non-Victron lithium batteries when the temperature drops below a certain point. The system also has a CerboGX and BMV-712 wired in. The Quattro temperature sensor is connected to the 24V battery pack and we have a second temperate sensor we can connect from the BMV-712 smart shunt to the batteries if needed.

Currently the Quattro only measures high battery temperatures as we under stand it. Is there a way to get the relay in the Quattro to disconnect Quattro battery charging if the temperature drops below a certain point?

Thank you for your help with this.

jefferyandcarolyn asked
Rob Fijn answered ·

2 Answers

New Lithium Smart Bank Commissioning. Watts Charged Lower Then Expected

Hello,

Making progress on a new installation of Multiplus 12/3000 + Lynx BMS + Lithium Smart Batteries (4).

I did my first set of load testing and got the bank from full charge down to 80%. When I provided AC shore power back to the Multiplus I only say about 1.2kW of charge current which then tapered down. See graph below showing the start of inverter test and back to charge.

The Multiplus is set to max 30A AC1 inlet

The Lynx BMS is set for

  • Battery Capacity 330A
  • # of Batteries in Parallel 4

I was expecting the Multiplus to have a larger charge current to the battery bank.

Anyone know what the max watts a Multiplus 12/3000 can generate on the charging side? The data sheet was unclear.

Could this be something the BMS is dictating through DCVV because I thought it only set the voltage settings.

Cheers,

-R

[image]

murphy-r asked
Stefanie commented ·

7 Answers

Install BMV-712 so that solar shows positive amps?

I have installed a BMV-712 Smart on a two battery setup using the #11 quick install schematic. While my solar panel is raising the voltage back to a full charge, no positive amperage is being shown on the Victron while doing so. I should be seeing positive amps as the batteries charge - correct? Any suggestions please.

britbyker asked
kevgermany answered ·

1 Answer

ESS 1Ph on a 3Ph Grid Connection - Energy flows not stacking up - Phase compensation playing up ?

Hi everyone,

I commissioned a first ESS system (1xMulti 3kVA on a 3Ph grid connection) a few days ago and cannot make sense of some VRM readings. I am a newbie to it and would appreciate your valuable insights.

For instance at night (see attached) I consume 63W on L1 and 10W on L3 that is 73W total consumption. Battery is discharging at 74W. I can live with the 1W discrepancy.

However, why am I drawing 9W from the grid ?

[image]


Another example during the day, early morning, consuming 68W on L1, 10W on L3 and 10W for charging the battery, so 88W in total. I produce 83W with PV so net difference of -5W. Why do I draw 33W from the grid ?

[image]



Last example, in the evening, I consume 3234W on L1. Battery is discharging at 2672W. So a net difference of 562W.

Q1: why does the battery not allow more power out ?

Q2: why do I draw 774W from the grid instead of the 562W ?

[image]




Thank you very much in advance for your time and consideration,


brice-p asked
netrange answered ·

1 Answer

VRM - how to display PV output as 12 volts ?

I would like to see the VRM solar/PV output in 12 volts/ amps instead of the actual PV volts / Amps / Watts.

[image]


My battery system is 12 volts, is there a way to have that PV widget display the 12-volt-style output and related amperage? When I look in the Remote console I see both the raw voltage/amps, AND the battery voltage and amps (second image). So clearly the information is there. Thanks

[image]

kajimike asked
kajimike commented ·

1 Answer

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