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Cerbo GX connection to multiple MPPT not parallel

Hello everyone, I am almost confuse about to monitoring 3 MPPT Smartolar charge controllers that we are going to connect to the Cerbo GX. Because the solar installation is more than 20 years old, "unfortunately" we have 3 string of solar panels connected with 3 battery banks and after by schottky diodes to the load (MM.WW. system), but we can´t optimize the banks because the space of each one is limited to joint them on one battery bank. for that reason we should monitor each MPPT Charge controller separately. Is it possible to monitor each MPPT (PV power, BAT power and load consume) or each MPPT should be connected to a GX device?.

Thanks for your support.

Jonathan Carrasco from Chile

Jonathan Carrasco asked

0 Answers

How to balance 2 MP-IIs in parallel

For last 3 months I trying to set-up 3 phase/parallel system out of one EasySolar-II and 5 MultiPlus-IIs.

First, in June 2020 I purchased ES-II and 2 MP-IIs and set-up my 3 phase system.

After couple months I realized that 2.4kW per phase is not enough for my house.

Decided to add 3 MP-IIs in parallel.

Asked my Victron supplier if there is a MP-II still compatible with my MP-II for parallel operation.

In turn he asked Victron the same question and got the positive answer.

"There is no problem to connect the actual produced unit in parallel to existing. The only thing is - firmware must be identic (which means that the units are identic also)."

At the beginning of 2021 I received 3 new MP-IIs.

To make this story short, after setting all up I have a problem with load balancing in all 3 parallel channels.

All wires on the DC and AC are equal lengths from the point they split to master and to slave.

On DC side wires are 35mm2 (around 50cm long from the split point) and on the AC side 6mm2 (around 60 cm long from the split point).

FWs are identical.

I am getting the following results when each phase is, one by one, loaded with 2.4 kW resistive load.

L1 Total 66A, Master 38A, Slave 28A

L2 Total 54A Master 32A, Slave 22A

L3 Total 55A, Master 32A, Slave 23A

Any suggestions how to make the currents equal?

The stickers on the boxes show the model numbers and part numbers of the first and the second batch.

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marekp asked
Phil Gavin commented ·

2 Answers

Existing Phoenix inverter, wish to purchase and add a MultiPlus in parallel.

I have an entirely off-grid installation with an existing Phoenix (48V/5000VA) 230V inverter and wish to purchase a MultiPlus (48V/5000VA) 230V inverter/charger to be installed in parallel configuration. The primary goal is redundancy (in case one inverter fails) and to enable charging of the batteries (if needed) from a 3kW generator (continuous 2.5kW capability). A secondary purpose would be to increase the power output capability.

I know there can be compatibility issues that have to be taken into consideration with paralleling.

The original firmware that the Phoenix inverter came with was 2624413. I have updated the Phoenix inverter from v413 to the latest v482 firmware version today, so if the MultiPlus doesn't come with the latest firmware I am more than capable of updating that to the same version.

I would be seriously concerned if a new MultiPlus didn't come with firmware starting with 26 (VE.Bus - new microprocessor, 230VAC) now, but I've cross checked the list of models document and 2624 is listed as "MultiPlus 48/5000/70-100 (+EasySolar)". It is literally the only model on that list that is 70-100 (70-amp battery charging and 100-amp AC transfer capability).

Am I correct in concluding that if I purchase a 2624 (i.e. a MultiPlus 48/5000/70-100) and update the firmware to v482, if needed, then it should be capable of being paralleled with the existing Phoenix inverter?

Second question is, if I was to purchase the MultiPlus and it failed to parallel could I instead fall back on a configuration to feed the AC output from the Phoenix into the AC input of the MultiPlus to increase the output capability?

I already have a changeover switch in the configuration to change the house AC supply from the Phoenix to the generator and could easily reconfigure that output to feed into the AC input of the MultiPlus instead. I'm not sure how the MultiPlus would handle that changeover from the Phoenix to the generator, I suspect it wouldn't too well, and it might get more complicated if the "Dynamic current limiter" setting needed to be enabled for the sake of the generator.

In the worst case scenario, I would feed the Phoenix output into the MultiPlus input and keep the inverters and generator separated by the changeover switch. This would provide the redundancy and increase in power capability. In this case, if I wanted to meet the goal of charging the batteries I would need to purchase a Skylla 48/50 TG Charger, which is practically doubling the cost as it's price isn't much different from the MultiPlus and it'd probably more beneficial to just buy another MultiPlus and just use that purely as a charger (if it can be configured that way). Really don't think I could stretch the budget to handle this.

My preference would be to parallel the Phoenix and feed the generator into the MultiPlus charger, this would eliminate the need for the changeover switch entirely and I think more likely to meet all the goals, but it would also be nice to know that even if I do everything right, there was a fallback position if the paralleling did not go as planned.

Happy to take advice if anyone has a better option to achieve the goals.

william-croft asked
offroadflow answered ·

5 Answers

Inversores en paralelo .

Buenas noches , dispongo de un Múltiplus 24/3000/70 que se me queda corto cuando hay algún consumo puntual alto , cambiándome como es lógico a consumir de la red aún teniendo suficiente potencia solar para soportarlo .Quisiera poner un inversor de apoyo en pararelo y necesitaría saber si son compatibles o como saberlo . Me han ofrecido (retirado de otra instalación por ampliación) un Phoenix 24/3000 que me bastaría aunque no lleve cargador ya que el mío lo tiene . No quiero adquirirlo sin saber si son compatibles . Les agradecería me dijeran como saberlo o que referencia haría falta de las que disponen los aparatos para saberlo .
Gracias de antemano.

aurelio-nieves asked
Mike Dorsett answered ·

1 Answer

Quid sur batteries 12V

Chers tous,

Je viens vers vous car je n'arrive pas à trouver réponses sur le branchement optimal de batteries.

Matériel : 2 batteries 200Ah avec 1 BMS sur chaque batterie, 1 Lynx Power In

Besoin : Rester en 12V, donc pas de branchement en série. Ça, c'est fait.

Par conséquent, il ne reste que deux possibilités : en parallèle ou en indépendant ( chaque batterie est connectée au Lynx ).

Mes questions :

Mieux vaut-il connecter en parallèle pour obtenir les 400Ah, ou, et c'est ici que ça se corse : connecter chaque batterie en indépendant + et - sur le Lynx ( 2 câbles pour chaque batterie ) ?

Si l'on fait de cette manière ( 2 batteries indépendantes sur le Lynx ), quelle est la valeur des Ah, 200Ah ou quand même 400Ah ?

Si l'on connecte 2 batteries de différents Ah en indépendant sur le Lynx, exemple avec 1 batterie 200Ah et 1 batterie 100Ah, les ampères s'additionnent pour obtenir au total 300Ah ?

Est-ce réalisable ?

Si l'on connecte en parallèle 2 batteries, que les batteries sont de même Ah, mais ne sont pas du même fabriquant ou du même lot, j'ai lu que ceci engendrera des risques d'usure prématurée, est-ce correct ?

Je vous remercie de m'avoir lu déjà et je me réjouis de vos réponses écarlates.

myhomebuzz asked
myhomebuzz commented ·

1 Answer

Smartshunt - positive wires for two batteries

Hi,

I have two lifepo4 batteries with take offs drom both terminals of each batteries as recommending for ‘parallel’ wiring by the manufacturer of the batteries I have.

Just wiring in my smart shunt - looking at the diagram in the leaflet with the shunt it shows both positive in the vbatt and aux connections for what looks to be a series wired battery setup.

Do I need to connect both my batteries positive wise to the shunt?

Chris Marks asked
wkirby answered ·

1 Answer

Unbalanced load on Parallel 2x Multiplus-II 5000/48 system.

HI All.


I'm hoping to get some assistance. I have been struggling to get my 2x multiplus-ii 5kw units in parallel setup correctly. Sorry. Let me phrase that again. They are set up precisely, in parallel, according to the user manual and is running, but the one always supplies all the load and goes into overload the moment I start pulling more than 5kw, the other unit does nothing the entire time.

When my system goes to pass-through mode, I can see that both AC cable runs thought the individual inverters are carrying the same amount of current. I have Volt and Amp sensors on both input and outputs of my multis to confirm this.

On the DC side, I have double-checked every connection, cable type and cable length, and places DC shunt current sensors inline with both inverters. The resistance through both DC runs should be very close to exactly balanced, but the one inverter will carry 80 to 100A (55V system) and the other inverter is sitting at 0.03A.

To make sure it wasn't anything to do with DC cables/system, I swapped the inverters around on the wall and kept everything else the same. The problem then moved with the inverter.

So my question, can anyone think of something else for me to test/configure/do? Or is it a faulty inverter.

Something I have noticed is that the inverter that never carries any load is disconnected from the shared AC bus, it fails with overload immediately, and then takes down the whole parallel system. It will not start again unless it is corrected to the shared AC bus, it just ends up in a overload loop and resets.


Lastly, I have upgraded my multis to the latest 469 firmware.


PS. Here is my .rvms file to have a look at my configured setup.

https://drive.google.com/file/d/1gJA8uLi4PELu5iGO1dQUiFhbKVDFKqLB/view?usp=sharing


Any assistance would be appreciated.

Regards,

Claude

oliverclaude asked
Mike Dorsett commented ·

6 Answers

EasySolar-II GX and MultiPlus-II in parallel. Lights are not synchronised, Is it correct?

I have paralleled a Multiplus-II to my EasySolar-II GX.

I have it working but I’m not sure if it’s 100% correct as I couldn’t get the assistants to work.

It’s an off-grid setup with battery charging done by solar and if I need a boost charge I temporarily connect a portable generator. I followed the paralleling tutorial and combined the 2 units via the system configuration tool and all went well.

Then it came to the configuration of the 2 units, it all started going wrong when I selected ESS assistant as I have grid code “none”. Then I changed grid code to one of the Australian codes and next I had bus errors, low voltage alarm etc.

Pushed ahead and loaded the file into the Multi as well. Couldn’t get the units to output power and bulk/float lights flashing on Multi. Went back in and put grid code back to none and deleted assistant, uploaded both units with this file.

EasySolar fired back up but Multi still had mains and inverting lights alternating. Started to pack away so I could work on it again tomorrow and when I got close I could hear the Multi humming. Turns out the system is up and running even though the mains and inverting green lights are alternating on the Multi. I test ran my lathe and it started no problem multiple times. Before the paralleling I couldn’t get the lathe to start at all.

Can anyone confirm if this sounds to be correct or should the lights not be alternating on the Multi?

the-doon asked
the-doon commented ·

1 Answer

2x Multi II 48-5000 in Parallel Very Low Charging

Hi to all

Trying to troubleshoot a charging problem with 2x Multi II 48-5000-70 in parallel Master & Slave. I also have Venus GX connected. The two units have been inverting great for couple months now but I had not used any grid charging my solar takes care of that. I normally switch the multis over to grid at 00.00 - 06.00 to take advantage of cheap rate and save my 1000 Ah FLA battery from cycling too low. Today, I decided to switch on the charger on the Master Multi to test charging and at 00.00 when the grid kicked in I see the Master go in to Bulk phase but... only 7-10A of charging ?? I realise by default the Multis only charge at 75% as when I only had one unit I never seen more than 53A charging (and I never figured out how to get the full 70A). I was expecting to see about 100A charging with two units in parallel?? The Input AC current Limit is set to 30A (15A on each unit) as my grid supply is 32A. All cables are uniform acoss the two units.

I don't understand why the charging is so low any help to figure out what is limiting the charging current much appreciated as I will need to charge overnight sometimes when the Winter arrives

TIA

PS I also put a DC clamp meter on each units DC cable and they are sharing the charge output, about 4-5A each.


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rithym1964 asked
rithym1964 commented ·

2 Answers

Smart shunt wiring (LiFePO4) in non-typical parallel wiring..

Hello,


I've searched and cannot find an answer to the question I have. I have 2 x 100Ah poweroad infinity LiFePO4 batteries - and after noticing that they were discharging/charging with different loads via the inbuilt BMS I contacted the vendor who put me in touch with the manufacturer. The manufacturer has suggested rather than a typical parallel wiring configuration (+ve terminals connected, -ve terminals connected, then a take off from 1 battery's +ve terminal to the load, and from the other battery, the negative feed), they've suggested that I have take offs from BOTH battery +ve and -ve terminals into the respective +ve and -ve busbars I have on my system. Whilst I'm not that familiar with it batteries I was a bit surprised at this suggestion - but I'm about to do it as currently I have this abnormal load + cell balancing going on (I'm sure its the BMS personally...)

Here's the wiring diagram that they've supplied me with.

[image]

For completeness, their reply to my question was as follows:

Thank you for getting in touch
Your method or wiring is absolutely fine for a Lead acid Battery fit out, but not the ideal recommended way for lithium
This is because the current flow (red cable) goes to the battery on the left ….  And then has to decide how much current goes through the left battery and then how much goes through the right hand battery …….  There’s no guarantee that the current  will split equally 
(same on the negative side)
So the cable 1 (charger) should go to the busbar – and a cable OF EQUAL LENGTH – from each battery to the busbar
Same for the negative - - cables of the same length form each battery to the busbar
Fundamentally there’s nothing really wrong in what your have done (don’t get concerned) , but getting the exact cell balancing won’t occur automatically
If you use the app you might find there are different Voltage rating on the cells ……. However the batteries will readjust in time
Its just your app will show a variation
Therefore to get over this and do it correctly, which is better longer term, if you can change to what I am suggesting would be better


Anyway, in the meantime I bought a smart shunt. With the docs saying that this should be the only thing on the negative battery pack terminal to measure the current correctly how should I wire this up?


There's two possible options that I'm thinking of:


1) BOTH -ve batteries connecting to the shunt, then the shunt to my -ve busbar if I can get the terminals on there.


2) An intermediary -ve busbar, where the two batteries connect to this new bus, along with the shunt, which then feeds my system -ve busbar?


Any help would be greatly appreciated.


Thank you.

Chris Marks asked
Chris Marks commented ·

1 Answer

Parallel/Serial - Excel V4.0 spreadsheet (Beginner question)

Good morning all,

I'm just starting out on my foray into solar and playing around with the v4 and looking at small systems. I think I'm being daft, but I don't understand the spreadsheet when it comes to parallel and serial strings, I'm only looking at a two panel system to start with but:

Going from one panel to two in parallel doubles the current as expected

Going from one panel to two in serial doubles the voltage and the current (?) Is this unexpected current increase because of how MPPT works as I'd expected voltage only to increase?

I hope I'm not missing something obvious


keiron asked
Vance Mitchell commented ·

0 Answers

Paralleled strings of same panels on different orientations

Hi there,

Is it acceptable with Victron MPPTs to install parallel strings of the same module type on different orientations? EG, 3 modules facing west, paralleled with 3 modules facing east, into the same input on the MPPT?

Cheers, Anne

anne-wilson asked
Phil Gavin answered ·

3 Answers

Parallel charging of mobile battery packs

Hi all,

I'd like to charge three 12V 18Ah battery packs from one 12V 100Ah fixed battery. The battery packs are meant to be used independently of the charge setup, and large variations in depth of discharge may occur, e.g. one fully discharged, another still 100% full. After use, they will be reconnected to the charge setup.

Would this setup work?: One Victron Orion Tr-smart 12/12 18A followed by three parallel Schotkky diodes to the three battery packs.

The disadvantage of the diodes is the voltage drop. Is there an alternative method to achieve parallel charging?

adb asked

0 Answers

Can Orion Tr 24/12 20 DC-DC converters be paralleled?

Do they have any load sensing for proper load sharing so one is not dominant?

eej asked
Alexandra answered ·

1 Answer

Can two Separate Multiplus II inverters supply different loads while using the same battery bank and still be connected and monitored on the same Network/GX Device

We have a client that has an existing system with a 3kVa Multiplus II. The client recently added a flat (garage transformed for the kids) and they want to add another inverter to assist with the load to this flat/garage.


1. Can both Multiplus units be connected to the same battery bank but supply different loads? (one the house and the other one the garage?)

2. If connected in this way, can both units be connected to one GX device or will both have to be separate in such a case with their own gx devices?


And a bonus question for silliness: Can two separate systems be connected to one battery bank? (Especially now that DVCC is "Regulating the usage of the battery"?


I know the safe connection will be to parallel them and to allow them to supply both loads as "one", but is this configuration possible? The client asked and I do not have an answer for this. I know there is similar post to this but not one that answers the question.

schalk-1 asked
marekp edited ·

3 Answers

Cyrix CT and engine starting in parallel
I have a cyrix CT 120A relay between the starter battery and the service battery which is a victronenergy agm deep cycle 110 ah.
Obviously the cyrix does a start with the batteries in parallel most of the time, that is, if the batteries are in solar charge or if the batteries are fully charged.
In your opinion is it harmful to the agm victronenergy?
I believe it is absolutely not harmful, as during start-up, the smartshuunt only marks 30A of absorption on the agm for less than 1 second.
I think This is because the resistance of the positive cable in series between the batteries and starter motor means that 80% of the starting power is supplied by the starter battery.In fact starter battery have a much more short and more thick cable, that cause a lot less drop voltage and supply more amps to the motor. But some peaple say me that's is no good.... 
In fact, the total absorption for starting is about 120A and are divided as follows: 30A on the agm services and 90A on the starter battery.
Furthermore, the data sheet of the agm victron says that it tolerates inrush currents of 500 CCA at - 18 degrees, and absorption of 880 amperes for 5 seconds.
So 30 amps 2/3 times a day for less than 1 second shouldn't hurt.
What do you think?
However, I have equipped the cyrix with a switch on the negative of the coil to exclude it during start-up.

francesco asked

0 Answers

Skylla - TG parallel connection

Hello,

I wanted to confirm if Skylla-TG 48V models can be connected in parallel for large battery banks. Also I need to know if they can monitored remotely using a GX device.

If they are not able to work in parallel then I need to know which charger device is compatible to work with a Victron system with option to be monitored remotely.

Regards.

dgmar-ni asked
wjf edited ·

1 Answer

3 Phase Quattro Overload Issue

I currently have a x15 Quattro48/10000 set up in a 3-phase configuration (5 units each phase). The system is off-grid and boosted by a 175 kW generator each evening for a few hours. Recently one Quattro on Phase 3 has been overloading during generator operation.


I have been able to temporarily remedy the problem by lowering the input current limit to 95A down from 110A. However, that 110A is what it has run at for the past 5 months without issue.

Previously the system has overloaded at generator startup/when the Victrons first accept the power, however these recent overloads have occurred hours into generator operation.

What could have the caused this Quattro to suddenly not be able to handle the incoming current?


Thank you

carver asked
michael2019 answered ·

1 Answer

Parrallel Quattro spurious Overload alarm v465

We have a new set-up (<3 weeks) with two Quattro 8000/200/100/100 24v 230 set-up to run in parallel linked to CCGX and Lynx BMS Control for MG Energy LFP batteries. Both units have been upgraded with v465. CCGX is upgraded to latest release.

Since day one we have spurious L1 Overload on Master Unit and usually concurrent to the event a load buzzing and the Slave unit is appears to be OFF with no fault when fault appear. No overload warning. All the incidents happened in light or no load conditions.

We have witnessed one incident with no load connected to the output of the quattros. The two outputs were cross connected at the time of the incident. We measured current spike between the two unit when this happened. It would seem that either the units are getting out of sync or one of the two unit is short circuiting causing the other unit to overload.

We have replaced the cross connecting Ethernet cable with brand new patch cable with no appreciable improvement.

Any Ideas, suggestions ?

jmarc asked
michael2019 answered ·

3 Answers

Orion converter - buffer battery min/max sizes?

I can't seem to find much information on the "buffer-charge a battery" feature. I'm assuming I can place a small Sealed Lead Acid (SLA) battery in parallel with the output + and common - and it can handle surge loads.

My question is, can I place a small 12v 20 AMP Hour battery to this? I'm guessing at a voltage setting of 13.2, it won't quickly charge the battery beyond it's 20% suggested limit. Any references to other materials regarding this would be helpful as I can't seem to find much. Thanks.

tazzytazzy asked

0 Answers

3 phase ESS only 1 phase working (solved)

I've done a 3x Multiplus II 5000 set up in a 3 phase configuration and noticed that when the system is set to TOTAL OF ALL PHASES in Multiphase Regulation it will balance the phases to near 0w as far possible by feeding into the grid on L1 the same as it would pull on L2 and L3. But this is not ideal if the grid meter is prepaid as the meter would charge you units for what u are pushing back. If I set it to INDIVIDUAL PHASE it only seems to feed PV into L1 and L2 and L3 dont get any PV benefit. The system consists of: 3x Multiplus II 5000, 2x Smartsolar 150/85, 14kwh Li-ion, and 8.9kwp Solar PV. What am I doing wrong or might it be better to set the 3 inverters up as a parallel system on L1 and put all my heavy loads on L1 if the system is not capable of supplying all 3 phases individually?

[image]

Andrew asked
Daniël Boekel (Victron Energy Staff) commented ·

3 Answers

1 Answer

solution to combine 2 LiFePo-Batteries in parallel

Im looking for a device that can manage charge/discharge of 2 lifepo-Batteries with BMS in parallel!

Thx in advance!

heinzr asked
Ulrich answered ·

1 Answer

2 batteries in parallel: double max charge current?

Dear Victron community,

I currently charge 1 SiO2 battery (max charge current 25A) with a Victron Orion-Tr Smart DC-DC charger 12/12-18.

Can I double the charge current if 2 of the same batteries are wired parallel?

The idea is to use 2 SiO2 batteries in parallel with the Victron Orion-Tr Smart DC-DC charger 12/12-30.

Thank you!

tr001 asked
tr001 answered ·

2 Answers

Grid parallel load vs. AC out 2

Good-day. I am trying to understand the difference between a "grid parallel load" and a load on "AC out 2" when using a Quattro or a Multiplus in ESS mode. Clearly, the inverter does not even know there is a grid parallel load unless it is configured to do so and there is an energy meter attached to measure the power flow at the grid input. (Any guidance on how to configure these aspects would be welcome). I have attempted to list the characteristics below - feel free to correct me :-


Load on AC out 2.

Powered firstly by the inverter (until the combined "AC out 1" + "AC out 2" exceeds the inverter capacity) and then by AC mains as well. The combined load must not exceed the rating of the transfer switch.

If the AC mains falls away, the AC out 2 is cut off.

Provides a way to make use of excess Solar PV yield on non-critical loads.


Grid Parallel Load

Powered firstly by the grid (under normal curcumstances does not require any additional capacity from the inverter).

Normally, the inverter drives the loads on AC out 1 (and AC out 2) as required. Under some configured conditions (not eactly clear how), the inverter starts to "push" power out of "AC in" and thus contribute to this grid parallel load. It can supply this load completely such that no power is drawn from the mains supply. The energy meter can be used to regulate the amount of power supplied via "AC in" so that it is equal to, but does not exceed, the grid parallel load.


Is there any guidance as to which approach can or should be used under which conditions.

Thanks,

John Hope-Bailie

johnhb asked
kuban-invertor commented ·

1 Answer

Victron Smart LifePO4 - Parallel Install - Battery Wire Lengths

Hi All

I am installing 3 smart LifePO4 batteries in parallel. Reading "wiring unlimited' - I am aware the battery wires (from batteries to busbar) must all be the same length.

Does anyone know if I can make -Ve and =Ve wires different lengths ?

Due to the orientation of the batteries and busbars - it would be great if I could make the 3 -ve wires 70cm and the 3 +ve wires 100cm. All -ve wire the same length (70cm) and all +ve wires the same length (100cm).

Thoughts or comments ?

Many thanks, Tim

miya asked
miya commented ·

1 Answer

Connect Batteries in Parallel or Individually?

I have a 4 battery system for my van. I have 4 Lion Energy 105Ah LiFePO4 batteries that I seek to

connect to my Multiplus 3000 Inverter Charger. I have seen some people hook them up in parallel

with 4/0 to a main switch, and I have seen some individually wire each battery to the Power In

Module with 1/0(?) and sometimes with individual breakers.


I am interested in this forums take on

which is preferred and why? Thanks in advance for any help here.

davesnothere asked
seb71 answered ·

1 Answer

Battery maintenance charging voltage

I have a Multiplus setup at my cabin with two AGM sealed batteries wired for 24v. I decided to remove the batteries when I winterized the cabin since I was concerned about charging when temps were below freezing. I had planned to maintenance charge them at my primary home during the winter but put it off. Now hoping I didn’t mess them up too bad and eeger to get them on a charge.

Question is can I hook them to a 12v charger in parallel while I have them off the system for winter? Or should I pick up a 24v charger to keep the batteries series charging in sync? Planning to purchase a blue smart charger as an “offline” charger but figured a 12v charger would have more purpose when not charging the cabin batteries.

Thanks Bob

bob-cook asked
michelg answered ·

1 Answer

Can one parallel a 100/20 and a 75/15 if each has own PV panels but share 24V batteries?

I read an earlier post of someone here having three 75/15 MPPT chargers in parallel on the same battery bank, not synchronising well with charging duties. I have a compact 1200/24 Inverter with three 150W PV panels (450W) in series running through my existing 75/15 to a battery bank of 24V 200A and I wish to generate a bit more energy to utilize the 1200W inverter better. Thought of just adding another 75/15 or going a bit biggere with say 2 x 300W panels through a 100/20 - but have some concerns of compatibility? Any advice guys? thanks

lyndiesel asked
lyndiesel commented ·

1 Answer

Grid assist application

Hello everyone.

my question is about grid parallel.

can i add to the Grid source the power of the Inverter when the load is high and prioritize the Pv power first

Can the load go over the max and be bigger then the nom power or the courant of the MultiPlus so the inverter can be underrated compared to the maximum courant required by the load


I have a 3 phases system with high load (2 pumps. AC, heat system plus the house consumption ) and i want to install 3 MP3000/48 in parallel so i use PV and when the load is high it powered from the grid.

i heard about grid assist but i have no idea how to make it run..... how to do that in practice

Thank you




redsam asked
michaelvausr answered ·

1 Answer

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