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multigrid

MultiGrid and three ET112 at ACout1- how?

Changing my setup I'd like to connect three PV inverters to the ACout. So far had two ET112 to the ACout, which worked well. I.e. I don't see the individual PV values but the sum of both, which is OK as I work with the Modbus data mainly.

Today I tried to add a third ET112, so I changed the Bus ID with Gavazzi Software. The meter is recognized by the Venus, however - I cannot assign it to the ACout1 like the other meters.
It offers the tickboxes ACout1, ACout2 and ACin but If I tick ACout1, it defaults back to ACin.
Is there a limit of two meters at the ACout?

txs


PS: don't worry about the factor 1 rule, my three inverters never get peak power at the same time.

vicky asked
matthias-roetzer commented ·

2 Answers

Induktionskochfeld mit Landstrom und / oder Generatorstrom wie am MultiGrid anschließen?

Auf meinem Boot habe ich einen 7kw Induktionskochfeld verbaut.

Der Betrieb soll folgender Maßen geschehen.

1. über Landanschluß nur zwei Kochstellen, Unterstützung über den Wechselrichter ist nicht gewünscht (möchte die Batterien nicht für das Kochfeld nutzen)

2. Der Landanschluß ist getrennt, über einen 8kw 3Phasen Generator von Fischer Panda möchte ich alle vier Kochfelder betreiben. 2 Phasen für das Induktionskochfeld, die Dritte lädt derweil die Batteriebank 24V/360Ah mit Hilfe eines Skylla TG24/50 und einem Sterling AB24/60.

Die grundsätzliche Umschaltung zwischen Landstrom und Generator geschieht direkt nach dem Trenntrafo über einen automatischen Sterling Umschalter Prio1, Prio2 und Prio3 (nicht genutzt).

Das MultiGrid kann über sein AC2 Ausgang eine Phase trennen, wie mach ich das aber bei Generatorbetrieb mit der 2ten und dritten Phase?

Als Maschinenbauer habe ich leider nur sehr wenig wissen über die Möglichkeiten der Bordelektrik.

Ich würde mich freuen jemanden zu finden, der mir bei dieser und evtl. zwei drei weiteren Fragen weiterhelfen kann.

Mein Boot wurde elektrisch komplett überarbeitet, leider ist mein Schiffselektriker kurz vor Fertigstellung erkrankt und komplett ausgefallen. Die restlichen 10% versuche ich nun alleine bzw. mit einem befreundeten Elektriker zu bewältigen. Dummerweise haben wir Beide, von der vielen Victrontechnik kaum eine Ahnung.

Guido


smilla asked
Ulrich answered ·

1 Answer

In welcher Umgebung ist der Multiplus II 3 KVA einsetzbar?

Ich plane eine Anlage mit einem Laderegler und Multi plus. Dabei mache ich mir auch Gedanken über den Einbauort und die klimatischen Bedingungen. Beim Laderegler scheint das unkritisch zu. Also draußen, regengeschützt. Wie sieht es aber mit dem Multi plus aus? Ist der laut? darf der zum Beispiel in einem Schuppen sein? Hat der eine Lüfter im Gehäuse usw. Wo habt ihr die Komponenten verbaut? Also Laderegler, Batterie, Wandler etc..

geko22 asked
thomasw-1 commented ·

2 Answers

Multigrid 48/3000 inverter priority ?

I have to change my current setup from ESS "feed in excess power" to "island mode / inverter priority" as feed-in is no longer tolerated by grid supplier.

As far as I understood the deprecated "self consumption hub 2" with "prevent feedback to grid" is the only way to control the power of non Fronius PV inverters, connected to ACout, by shifting frequency. ESS does support Fronius only - correct? My Inverter (3,5kWp) doesn't allow true power regulation, but as a workaround I can at least switch it off, by setting the upper frequency limit.

I understand this is not the best setup but I need a solution asap.

I plan to connect the loads to ACout1. Average load is 0.5kW, usually not exceeding 3kW.
In case load increases to maybe 4.5kW I hope the "Grid Assist", properly set, will handle it.
Battery is LG Chem 6.5

In case the Inverter fails I'd like to have th eoption to manually switch my L1 loads to the grid

Please let me know your thoughts

Thanks

I skip all the fuses and wiring details, just the principle

[image]

vicky asked
vicky edited ·

2 Answers

Does Enphase micro inverters play nice with frequency shifting from a multi?

Hi,


I can’t seem to find something that says if the Enphase micro inverters play nice with the frequency shifting from the multi


My solar system is AC coupled and I have a multi 3000, upgraded to Firmware 431.


My array is 3500w big but because of odd angles I never see over 3090w so I am not to worried about the 1:1 rule


Thanks

dewitpj asked
dalek answered ·

6 Answers

Mijn Multigrid 2 48v 3000 should be able to produce an outputpower of 2400 watt. At 25 Celcius and colder my Multigrid is producing a maximum of 2250 watts. Why is this?u

Mijn Multigrid 2 48v 3000 should be able to produce an outputpower of 2400 watt. At 25 Celcius and colder my Multigrid is producing a maximum of 2250 watts. Why is this?

And what kind of configuration is necessary to produce the maximum of 3000 watts. The multigrid is build into my boat and I can use my boat now as a powerbank for my solarpanels. The boat builder says it is not possibel to have an output power of 3000 watts

aqua-volta asked
aqua-volta answered ·

2 Answers

Unknown charging current limitation Multigrid 48/3000/35

My Multigrid 48/3000/35, Venus GX, BlueSolar Charger and Fronius Primo 3000 works with actual firmware. The problem is: Multigrid should charge the batteries with max 35A but he wouldn`t set the current above around 20A. So energy of the Fronius is feed to the grid. DVCC is set on, current limitation off, Pylontech parameters are 100A (4 batteries UB2000 Plus). See picture below.

What`s the problem?

[image]


moeterxl asked
moeterxl edited ·

2 Answers

Offgrid upgrade Multiplus 12/1600 adding 12/3000 possible?

Is offgrid Multiplus 12/1600 adding second system 12/3000 possible?

If possible how should i electronically connect?

is the 12/3000 master and 12/1600 slave?

i could not find any topic on this matter just 1 or 2 topics not answered.



energywonder asked
wkirby answered ·

1 Answer

Making Enphase IQ connected with AC input work with the Multiplus in ESS

Hi all, My system is 1.8Kw panels with enphase IQ microinverters and enphase envoy controller. I have the enphase set to no export with two CTs on the grid input. That works fine with no issues.

The system has to be AC coupled, I added a Multiplus 48/3000/35-50, 220V and used a 32A Victron autotransformer to get the split phase system to work properly. also have 8 x 6v GNB Marathon Element AGM batteries.


My issues with the system are:


*Optimized Without "Batterylife" mode, the charger doesn't reset after a discharge to minimum SOC, so effectively stays all the time to the latest status it had(eventually remains in float forever), Here in my region I don't like Batterylife changing the "active SOC limit" on daily basis because some days are cloudier than others. But cant use it without Batterylife, because the problem with charging.


*The Enphase no export limit seems to be around 50W, this cant be changed, so I had set the ESS "Grid setpoint" to 120W. During day time, after the ESS detects loads getting under the grid setpoint, it does start charging, but immediately enters self consumption any time the loads are greater than panel generation. This keeps interrupting the charge on cloudy days, there is some claims that is better to charge the batteries to 100% before using them on the next cycle.

The solution could be using a schedule to set the daytime as charge only, not allowing self consumption to kick in. And also for the inverter to use the battery when the tariffs are higher, or to allow the batteries to rest in float mode for a while(there is also claims on this to be good for the batteries). Basically something that tells the system when it is allowed to kick in the inverter.

A work around I found is setting the "Maximum inverter power" to 0W every night after battery is discharged to "Minimum SOC", with "Limit inverter power" enabled. Then I have to set it back up for the inverter to start back. But I see no reason why couldn't be automated.


*When the grid is gone the Enphase envoy seems to command the microinverters to shut down, because it does detect 0 Watts on the grid input. I had to manually change the enphase profile to allow export, for them to come back to life. I plan to test a relay that activates a load to trigger the current transformers to report a fixed load above the grid setpoint on the envoy. I think I have to wrap several turns around the CTs to achieve this with minimum load.


Regards

Alex V.

DR


aleuli asked
perma-batteries answered ·

2 Answers

Fehler im Dashboard

Bei mir werden im Balkendiagramm (Dashboard) die PV Erzeugung und der Stromverbrauch nicht saldiert. Im CCGX stimmt alles. In der Erweiterten Ansicht (Systemgrid) wirds auch richtig saldiert angezeit.

z.B. Juni 2019 Stromverbrauch, mit Netzbezug.

[image]


Gleicher Zeitraum im Systemgrid, kein Netzbezug.

[image]


Das gleiche Spiel bei der Einspeisung, im Winter wenn nichts von der PV kommt, habe ich Einspeisung weil die Phasen nicht verrechnet werden.

Ich hatte damals Kontakt mit Victron Deutschland, hier hies es, es wäre ein Installations Fehler und ich solle mich an Service Team Döbeln wenden. Die hätten aber gerne eine 4 Stellige Summe gehabt, auch wenn sie das Problem nicht lösen können. Mittlerweile kenne ich jemand mit dem gleichen Problem, der die Anlage von Service Team Döbeln hat. Ok die bekommen das selbst nich richtig auf die Reihe.

In Holland hatte ich dann Kontakt mit Herrn Boonstra, er kannte das Problem mit dem Balkendiagramm und vertröstete mich. Das Problem sei bekannt und sie arbeiten dran.

Jetzt sind 2 Jahre vorbei, meine letzte Anfrage vor 14 Tagen ob es nun schon eine Lösung gibt, wurde nicht beantwortet. Kennt jemand einen fähigen Kontakt in Holland?


Gruß

Thomas

stromsparer99 asked
stenis answered ·

9 Answers

Customize equalisation settings for batteries
Regarding equalisation of flooded lead acid batteries, taken from Victron manual:

This setting is intended for flooded tubular plate traction or OPzS batteries. During absorption the voltage limit increases to 2,83V/cell (34V for a 24V battery) once the charge current has tapered down to less than 10% of the set maximum current. Not adjustable with DIP switches. See ’tubular plate traction battery charge curve’ in VEConfigure.


I'm wondering if there will be an issue here. To equalise our batteries (to get in the 31 - 33v range as specified by manufacturer) equalisation charging current is usually around 50 - 55A, due to the size of our battery bank (1380AH). So I'm wondering if this will allow correct EQ charging. If it tries to equalise 10% of charger capacity (70A) being 7A it won't work. Or does it refer to 10% of battery max charge current, which is much higher than the 70 amps this inverter can do. Are EQ settings customisable or am I misinterpreting it?

Note that under all other circumstances 70a for charging is more than enough, its much more than they get from the sun the other 9 months of the year.


Specs from the battery manufacturer are as follows:

Equalisation current: 3.5% of C100 AH capacity (1380AH) gives us 48.3A. That sounds about right.

Should give voltage of 2.6 - 2.75 volts per cell (31.2 - 33v), thats about right, maybe at the lower end of the spectrum.

Interval: 20 days.

Duration: 2 hours.


They really do seem to need it at least once a month during winter, even with conservative DOD. I've attached documentation should you wish to view. Also note normal recharge maximum voltage should be 2.45v per cell, I believe that means absorption should be set to 29.4 volts. That was definitely the case with the PWM charge controller we inherited with the system.


So how to get multi to equilise correctly!

upperyv asked

0 Answers

Multiplus or Multigrid for off-grid

Hello, I had a question about Multiplus and Multigrid. I am building a small off-grid system with 4 solar panels off 300 watts each that will charge battery's using an MPPT charge controller. I also want a backup generator to charge the battery's if they get under a certain level, and I will be using an inverter to make 230VAC 50Hz from the battery bank. At least I am also using a wind turbine that will give me a peak of 600 watt.

So a short list of items.

- 6x Solar panel 300 watt

- Battery bank

- Multiplus or Multigrid?

- Inverter

- Backup generator


What will be the right choice? Multiplus or multigrid.

And is this a realistic setup? Or is there a more efficient way?

mike-schoonen asked
nick-wiggill edited ·

3 Answers

Feature request: Germany 70% feed in limitation of ESS to the grid

My system: Multigrid 48/3000/35-50 with Venus GX and two connected Pylontech US2000 Plus. A BlueSolar 150/35 is DC- connected to the Multigrid. My Fronius Primo 3.0-1 is AC- connected to the output 1 of the Multigrid. The gridmeter is an ET340.

Now i want to feed in the excess energy to the grid after loading the batteries to refinance my pv- system. If i want to get my feed in energy payed i have to register my system by an electrician to the energy supplier. There is a law in Germany called EEG: Only feed in 70% of all the generators maximum power output. The electrician have to set and confirm that the maximum power feed to grid is set to 70%.

Without this limitation to 70% on the entry point to grid you have to install a radio remote controller to govern down your system in four steps by the energy supplier in case of over- energy of the grid. This controller costs about 1100€ and monthly 5€. Last choice is to cut off all inverts to 70% of power generally.

Further information see: http://www.buzer.de/gesetz/11230/a188267.htm

The technical system and measuring devices are installed, available and working fine at the ESS. Other possibilities to limitate to 70% means an huge technical effort to the whole system and money or a loss of energy.

The Fronius and BlueSolar MPPT can be governed by the CCGX to zero feed in to the grid (works fine) but there is no possibility to govern it to a adjustable max. feed in to the grid.

I need a function to set the maximum power (50W steps) feeded to the grid by the ESS.
Priorities: 1 = self consumption; 2 = loading batteries; 3 = feed to grid with adjusted maximum power
This is an important function to use this system in Germany to feed in to the grid.

I don`t know the exact conditions of the network operators but password protection for the max. feed in value will be necessary.

Is Victron planning such a function?

moeterxl asked
ossi commented ·

7 Answers

D.C. current in the external protective earthing conductor

I have read in some Victron manuals (MultiGrid and EcoMulti) the sentence:

"This product can cause a d.c. current in the external protective earthing conductor ".

Can you please give some technical information to understand why this happens?

Can it happen to more devices, such as MultiPlus?

Thank you!

Francisco Aroca asked
solguy answered ·

2 Answers

MultiGrid don't use MPPT when battery reached 100%

In my ESS-system a Fronius Symo 8.2 is at AC-in and a MPPT250/100 at AC-out. When DC feed-in is disabled and the battery has reached 100% no power comes from MPPT but all from the Fronius.

[image]


Only when the Fronius no longer supplies sufficient power does the MPPT switch back on. This is how I lose feed-in remuneration. Is it possible to prefer MPPT-power for critical loads?

maha asked
maha commented ·

1 Answer

MultiGrid 3000 - VE.Bus Error 11 (step 6)

Hello,

I have an ESS 3-phase installation with 6 MultiGrid 48/3000/35-50 (two on each phase).

The system runs fine except this famous relay test.

I tried almost everything to troubleshoot this error, but before I try to contact my vendor(s) for the Multis, maybe someone here has an idea.

First of all, the error happens with or without load at the Multis. Without load means that there is nothing connected to the ACout of the Multis.

If I disconnect the Grid from the Multis (ACin), the Multis disconnect Active(in) and Neutral(in).

Measuring now the impedance between Neutral(in) and Neutral(out) shows > 5M Ohm, which looks correct for me.

Measuring Neutral(in) against PE(GND) shows 0 Ohm, Neutral(out) against PE shows > 10M Ohm.

If I disconnect the PE (GND) from the Multis the relay test passes without error and everything runs smooth.

I got my first 3 Multis about a year ago, the others are from October last year (1) and from two weeks ago (2).

For the error details see the attached pictures.

It would be very helpful to know what is tested during 'step 6'.

Any help is very appreciated.

[image]

[image]

schwarzenbergf asked
vicky edited ·

6 Answers

Parrallel Multiplus/Grid security switch linked to master cutoff switch in Home distribution unit

Hello,


I've been scowering documentation and community's about this but could not find a scenario that fit's mine.

I'm planning on running a Multiplus or Multigrid unit in parallel with the mains, to function primarily as UPS for 1 specific load group, utilizing surplus DC from the solar inverter and AC from the mains to keep the battery's charged.

In The Netherlands, it is obligatory to have your Home distribution unit wired in such a way that the whole power system can be turned of in 1 action with 1 hand. usually, this is done by placing a master cutoff switch in the lower right corner, marked red, that turns of all power in the building in case of work, fire, or other emergencies.

I can use an auxiliary contact or magnetic contact linked to the Main cutout switch to trip the ESS Safety security switch assistant so that it shuts down the AC part of the unit.

Is this also possible using the Remote ON/OFF input on the unit itself? I rather not rely on software-based triggers in case of emergency if at all possible of course.

How have other people solved this issue? I know it is kind of contradicting wanting to run it as a UPS to make sure you have power in case of an outage, but at the same time being able to completely cut off power to all loads and disabling the Victron Multi...

Any thoughts or links to reference materials in this?

svanderlaars asked

0 Answers

Spare part for multigrid - baseplate.

Hi

Does anyone know if I can obtain the multigrid baseplate as shown in red as a sparepart and how do I order it?

[image]

ejrossouw asked
ejrossouw commented ·

1 Answer

Multigrid II "Mains On" LED off

Good day, I have Multigrid II with Venus GX and grid meter running perfectly fine for just over a year and still running strong. This morning I have noticed that the "Mains On" LED on Multigrid panel is off while Venus GX UI shows that it is on. Because I think that it's very unlikely (although not impossible) for LED to break, I am wandering if there could be something more serious behind it.

Kind Regards

Slawek

slawek asked

0 Answers

Multigrid - stop discharging battery based on external signal ?

I still want to stop my Multigrid from discharging the LG battery, when charging my car during the day. Firstly it is not efficient to use battery power to charge another battery, but main thing is to preserve battery energy for night time when PV isn't available, to the grid suppliers either. During daytime there is plenty of PV power fed in the grid, so I am OK to use this whilst during nighttime sources are different - not PV for sure.
So is there an input (sensor) I could use for that? E.g. stop discharging by applying a certain voltage somewhere, make a short or connect a switch or whatsoever. Txs for any help

vicky asked
vicky edited ·

4 Answers

How to avoid "Battery to Grid" ?

I pulled VRM kWh data to see results of the first full month Multigrid and PV Panels working.

PV Yield in total is 417kWh, looks OK.

However what I don't like is the ratio of Battery to consumer 62.6kWh vs. Battery to Grid 30.5kWh

Of course I don't want to use my expensive RESU battery to feed the grid.

How can I avoid this?

Txs

Grid Setpoint is 30W

vicky asked
JohnC commented ·

5 Answers

Multigrid Mains and Inverter LED blinking

I just discovered my system draws 50% pwr consumption from grid although battery is 68%.
Main LED and Inverter LED are flashing, Bulk is on. First time this happens.

[image]

vicky asked
vicky answered ·

3 Answers

multigrid ground relay

Baxi ecoblue boiler tripping fault 432 earth fault?

andrewjohnfrazier asked
andrewjohnfrazier answered ·

2 Answers

MultiGrid: LEDs for Mains, Inverter and Absorption 'On' at the same time

Hello everyone,

I'm using 3 MultiGrid and Pylontech Battery without any load at the output. This setup has no particular purpose at this moment, but my task is to prepare a GUI for a communication between the Venus GX and a PC using Modbus. So I use ESS Mode 3. I'm frequently switching between ESS Keep Battery Charged Mode (to charge the battery when I'm away) and ESS External Control (to test and to run my Modbus GUI).

Both modes ran perfectly for about a month, which means I could charge and discharge the battery with energy from/to grid through Modbus communication. Until one day, on which the settings in MultiGrid might have been changed. Since that day, both modes don't work:

In ESS Mode 3, Venus GX doesn't react to the setpoint I sent, but data such as battery SOC can be read as usual. In Keep Battery Charged Mode, the battery is not charging, and most confusingly, these LEDs Mains On, Absorption and Inverter are on at the same time.

I've used Victron Toolkit App to understand this LED combination, but this combination is not available both in the app and the manual. How can these problems, or most importantly, the Keep Battery Charged problem could be solved?

Your help is highly appreciated. Thank you.

[image]


mohdmohamad asked
ramassamy commented ·

4 Answers

ESS (AC DC coupled) "Feed-in excess solar charger power" not full potential

Hi

i running a ESS (MultiGrid 48/3000 FW459, VenusGX FW v2.31with EM24) with AC Coupled third party PV Inverters (via ET340 and ET112) and a Smart Solar 150/35 v1.39 and a BYD B-Box 5.0kWh. (DVCC enabled, SVS disable, Smartsolar has BMS controlled)

The DC Coupled PV system is oriented south and could be enlarged by approx 900 Wp, since currently only 1,8kWp is installed. Maximum charge power to battery is limited at 2000W fixed due to the 35 Amps - i know ;).

In the ESS Settings I enable " Feed-in excess solar charger power" but soon i discovered the the typical behavior of the system was to charge from the East oriented AC Coupled inverters, which means, the the battery is full, sincce there is enough excess. But the south orientated DC coupled PV System was dearted by over 50% due to battery being at SOC 100%, even with the enable option of "feedin excess DC Power". Over have of the production of the south oriented DC coupled PV is derated (see pic attached, redline is potential solar production).

[image]


To prove my hypotheses i changed the ESS Setpoint to activly discharge the battery into the grid, thus a lower SOC than 100% is realized. this enables the BMS controlled Smart Solar to use the full potential of the PV system. (previously 340W production goes up to 900W Production).

See my screenshots and notes

ESS Feed-in excess solar charger power - not full potenial.pdf


Conclusion:

I presume that the Mutligrid doesnt discharge/feedin as much power as the full potential of solar available on the DC side.

I would presume that the voltage Gap between SmartSolar and Multiplus isn't high enough for Multi to discharge the battery more but to keep it at 100% and though making it possible for the SmartSolar to feedin more of his potential solar power.


So propably i will not add any more Modules to the Smart Solar or install another SmartSolar, but install another PV Inverter AC coupled.


If anybody has the same Issue please let me know!

If anybody has an idea how to optimize the use of the DC coupled Solar to feed into the grid, please let me know! I thought already of an external PLC writing the ESS Setpoint into the Modbus register, to actively reduce the SOC during the daytime, to make more use of the DC coupled PV System.


THX

BR

Ossi

ossi asked
ossi answered ·

3 Answers

MultiGrid measures bogus power values

We have an installation where a MultiGrid measures/calculates bogus power values.

[image]


The powers to the left (grid, pv and battery) are all correct.
However the AC loads value is way off.

Strangely, the inverter measures negative power values on both ACin and ACout.
However, nothing is connected to ACout at all!

We have tried to "redetect system" as described in the FAQ, but that didn't help.

What could be the problem here?
Thank you
Ivo

[image]


[image]

ivo asked
Daniël Boekel (Victron Energy Staff) answered ·

1 Answer

Solar query to run small office - EasySolar Vs MulitGrid Vs other options

I have a small office with fairly low daily electricity use apart from the depths of winter where we might run a electric heater.

Basically just two desktop PCs, a laser printer, router, cordless phones, a few LED lights, kettle, occasional microwave use if want something warm for lunch, 8 hours a day Monday to Friday.

Its got a mono-pitched south facing roof, so plenty of useable space for panels.

The building is only rented, so don't want to spend a vast amount on some feed-in type setup with export meter selling the excess, I just want to try and make the majority of what I use, and at the same time save a bit on the electricity bill.

I am struggling with what option to go for, as want to try and get the biggest benefit from what I have to spend.

I am tempted to go for a SmartSolar 100/20 (on 48V) and going as close to the full 1160W as I can on the panels, 4x 12v 100Ah-ish batteries, and then use a Phoenix 800VA (on 48V) inverter to run all the low powered stuff, PC's, Phones, Lights, etc... and leave the Printer, Kettle, Microwave and Heater on the grid. And in the winter if I struggle for solar power I could move some or all of it back onto the grid.

Is the fact I will be using the power during daylight hours going to give the batteries a problem? As they are probably only going to get back up to float during the weekend when there is no drain for a couple of days.

Or is it one of those things where I just need to bite the bullet and do something, and if its not enough I will have to swap something out for something bigger, or add another MPPT controller at later date.

I really do like the idea of the EasySolar how its all in one box, but unless I spent serious money and went for the 3kVA one, the 1600VA (on 24V) doesn't really let me run much more PV than the 100/20 (on 48V) but obviously could pull from the grid automatically if there wasn't enough PV or Battery, rather than me having to manually plug stuff into another socket.

Or to really throw a spanner in the works, when I look at the example layouts the Multigrid seems ideal as has enough power to run everything through it, and I could run a surplus of panels on a normal Grid-Tie AC type inverter, but set the Multigrid not to export the excess, and it would use the battery bank to fill in the gaps in the solar, and would only fall back onto grid if there wasn't enough solar or battery.

Any ideas or advice is greatly appreciated.

avs-power asked
partpilotuk answered ·

2 Answers

MPPT Peculiar Feedback Behaviour - 20% Energy loss

Good day,

I have a Victron 2x Multiplus 5000 paralleled with a set of East and West Facing panels. I have a total of 18*315W Panels East and 12x355W panels West. The East panels are on a 150/100 MPPT and the West panels on a 250/100 MPPT. The Multiplus Firmwares are on 2624459. The CCGX is on 2.33 and the MPPT's are on 1.42

I have 1 x ZBM2 from Redflow and I can feed back into the grid. My problem is that I have long suspected I'm not getting the full available yield from my system due to some throttling of the MPPT's.

I have played with the Grid reference point and I've now seen today that if I set the grid reference point to -2000W I have today actually managed to generate 20% more yield from my East MPPT. (Yesterday the 17th I generated 19.2 kWh and today over 24 kWH). Both mornings were sunny without clouds. Unfortunately it became cloudy in the afternoon and the West MPPT was not observed so I couldn't see the full impact on the total system in the afternoon.

I have attached the graph from the Portal here for the last 3 days and you can clearly see that when my West MPPT is starting to receive sunlight it is starting to throttle back the East MPPT. However, today when I put the grid reference point to -2000W at about 7:30am I almost had a clean PV distribution curve on my East MPPT.

[image]

I also have taken the last 7 day's hourly profile and plotted that onto each other and you can clearly see the massive difference that I've seen today.

[image]

And for the full system:

[image]

I honestly believe that for some reason ESS is not allowing the full potential of feedback to happen and really would appreciate if someone at Victron could investigate the cause of this. A loss of 20% is quite substantial and I dont' want to have to every day set my system manually into a negative grid reference point to get the max from my system.


Any thoughts on this issue?


Kind regards

Marius


jsmvanwyk asked
Phil Gavin commented ·

1 Answer

Multigrid not running on batteries..?

My customer's system comprises:
24/3000 Multigrid - latest firmware update installed
Aurora PV Inverter with array
24V/200Ah NiFe battery set.
Standard Grid connection
Household loads

They want the system to charge the batteries during the day from the solar power and discharge at night. It's not discharging from the batteries at night.

I've checked the wiring and it all looks right to me. He tells me it is as per a Victron specification.

The Multi sees the batteries and charges from the grid and/or the PV, but is not discharging overnight.

I've flashed the firmware to latest version (1949159) reset to factory, and programmed the parameters to suit the NiFe batteries but it won't discharge them after PV input drops off in the evening.

What could be wrong?

diamond asked
diamond answered ·

2 Answers

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