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EasySolar-II GX and MultiPlus-II in parallel. 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 edited ·

0 Answers

bluesmart mppt 75/15 parallel

Für eine temporäre Installation einer Solarladeanlage würde mich interessieren, ob es für den bluesmart MPPT 75/15 ein Problem ist, wenn die Batterieen während des ladens von eienr anderen Quelle zusätzlich geladen werden (Lichtmaschine oder Landanschluss)...

kdietmar asked
Matthias Lange - DE answered ·

1 Answer

Paralleling Li Batteries


I seen a number of references to the number of Li batteries that can be paralleled, either 5 or 10.

Which is correct? Also what is the reason for this number of packs?


KathyS asked
Alexandra commented ·

2 Answers

Can I parallel a Quattro and a multiplus of the same size and rating?

Hi there,

I have a Quattro 48/5000/70 and i want to try paralleling it with a multiplus of the same spec,
as I understand it as long as they have the same firmware this should work?

Ryan Bernic asked
WKirby answered ·

1 Answer

Help with Overvoltage Error #38 when in ESS

I replaced my solar panels and upgraded to two Victron SmartSolar MPPT 150|100-Tr Solar Charge Controllers. I had two 100/50 controllers previously. The system was and is hooked up with a Victron Multiplus 12/3000/120-50 120V running in ESS. This is all installed in an RV.

Now with the 150/100's, when shore power is plugged in I am seeing the Charge Controllers eventually shut down with error #38 Over Voltage error. This did not happen with the 100/50 controllers. I've made sure that all settings on the controllers and Multiplus are set to a 12 vdc system with 13.6 and 14.4 to be the charge levels for the 400 AH's of BB lithiums I have.

So far my troubleshooting has been:

  1. Shut down and restart system (2-3 times)
  2. Ensured all firmware is latest
  3. Ensured all assistants are the latest
  4. Set Multiplus charge voltages to 13.4 and 14.2 (same error occurs)
  5. Tried un-networking from BMV-712 (same error)
  6. Removed ESS and run with and without shore power
  7. Reinstalled ESS assistant and settings back to original

I'm still getting the #38 error after about 20 minutes on one controllers and then about 5 minutes later on the other charge controller.

Does anyone have any suggestion as to what I should do next?

Thanks in advance

Todd Wackford asked
Todd Wackford edited ·

0 Answers

Bypass wiring in case of pass through failure?

I'm using two Quattro 5000kVA 12/120 inverters in parallel on a boat. I have two questions:

1) Others have experienced pass through failures where the inverter failed and does not pass through either generator or shore power - thus leaving the boat with no AC power options. Would it be wise to wire a bypass so the boat could have generator or shore power incase of inverter failure? (Wiring a bypass seems a bit complicated).

2) In the event of a single inverter failure in a parallel configuration, is there a simple way to revert to a single inverter failover mode? Also, this might inform question 1 because the second inverter's pass through might act as pass through in the event where one inverter failed.

Thanks in advance for any thoughts!


tfmkevin asked

0 Answers

How to connect 12v DC generator in parralel with Smart Solar controller

How to connect 12v DC generator in parralel with Smart Solar 12v to the battery to avoid conflicts during the charging ? Does anyone have drawing ?

Denys asked
LKLMEnterprises commented ·

1 Answer

3-Phase System Wiring


From other brand of invertes I saw he posibilities of combining different sets of Inverters with their own Battery bank (Cluster) to suplly a comond Load. see diagram below.

I have the following requirement for a victron off-grid project Desing:

1-Due to the client needs I cannot create a single big battery bank to supply the load,

2- in stage 1, it is required to have single inverter clusters (Inverters + batteries) of 60 kW, to supply different loads around the country. Then, it is desired to be able to combine at least 3 clusters each of them feeding to a single line in a 3 phase system. as presented in the next diagram:


Additional Information:

1-Battery sets: Lithion Battery of 18.6 kWh and up to 12 parallel integration (222 kWwh).

2- Clusters of 6 Victron 10 kW/120V ( can be configure to a 3 phase system or a single phase depending of the ntegration)

3- Maximum requiered load when combine in a single system 600 kVA, Can be divided in smaller isolated system( Example: 4 X 150kW).


1- I want to know if it is posible to combine for example 3 clusters of 60 kW (each of them feeding a single line : L1, L2 ,L3) for a total output power of 180 kW and a energy storage of 666 KWh?

s.robinson asked
s.robinson commented ·

1 Answer

80V Leerlaufspannung an MPPT 75/15

Kann ich zwei 24V-Panele in Reihe an einen MPPT 75/15 anschließen? Die theoretische Leerlaufspannung sind dann 80V. Ich sage theoretisch, weil die Module flach montiert werden sollen.

Ist dann überhaupt mit einer so hohen Leerlaufspannung zu rechnen und falls die 80V erreicht werden sollten (sicher nur kurzzeitig), kann der 75/15 das noch vertragen?

Grüße Dirk

Megatroniker asked
Megatroniker answered ·

2 Answers

3 Phase and/or Parallel with 24/1600 Multiplus and Phoneix Compact


I'm kind of preparing my Vision, and trying to get all the Stuff together that i need.

so Questions popped up for me.

Question 1:

Can i combine the

Plastic-case-Multiplus-1600 <-> Metall-Case-Multiplus-1600 <-> Metall-Case-Phoenix-1600

either in parallel or to a 3 phase combination ?

I know that i have to look up for the "Type "

"All units in one system must be the same type and firmware version, this includes same size, system voltage, and feature set. The type is indicated by the first four digits of the firmware version number. "

So, but how would i know the "Type" before i buy them ? or can i anyway count that no matter what hardware-version i buy i can update them to the same Firmware number.

The Quote does not clearly point out that the same "Type" means it has to be the exact same Product expl. "Phoenix 24-1600"

Its totally clear to me the the different Device have to be the same Woltage and Wattage and all have to own a VE.Bus.

Question 2:

In Case i combine 1 Multiplus with two Phonix in parallel...

...can i use the Charging function on this one single Multiplus in the parallel Combination then ?

greets and Thanks


notger asked

0 Answers

Orion-DC-DC Charger with existing battery parallel switch

Many, if not most motorhomes and boats have a manual house battery parallel switch to help start the engine on a low battery. Would it be a bad idea to short the Orion input and output while it is charging? How will it react? Or will the input breaker trip? Assuming this is undesired, is there a way to use the H and L connections to automatically inhibit charge with the +12V going to the parallel solenoid? (Engine ignition is used to allow Orion to be OFF with zero draw with engine off).

Does anyone know the full logic of connections L and H?

I have read the manual and asked for help from Victron and this forum but had no response.



3dYM asked
Wildebus commented ·

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 ? asked
Jwfrary answered ·

2 Answers

Series-Parallel vs Parallel Efficency

Currently I have (3) 100W panels wired in parallel that typically operate in the 17-19v range. During full sun they generate power in the 15-20A range. These are wired into an MPPT 100/50 unit that I purposely over-sized as I expect to grow the array incrementally over time. I have currently chosen the parallel configuration as it seems to have more immunity to partial shading, but I probably incur a penalty during full-sun conversion in terms of efficiency.

Aside from the extra power generated by adding a 4th 100 watt panel, would my full-sun power generation efficiency increase significantly by creating two pairs of series panels (for 34-38v) and then running these two series pairs in parallel? I'm sure the voltage increase would help with any cable losses I might have built into the system. Presently my smallest cable is the 10ga at the panels, but I do have nearly 40ft of 8ga and 6ga flexible copper cabling. The (3) 100W panels are set up as a portable/re-positionable ground array for replentishing (2) series-wired T105 6v deep-cycle golf-cart batteries on my RV. Basically I want to be able to recharge the 30% or so battery capacity that I consumed the previous overnight as fast as the batteries can handle (10% of 225Ah). Maybe someday I'll be able to afford to switch over to Lithium cells, but that will have to wait for now.

Honestly, setting up two separate two-panel arrays might seem like more work, but I think the lighter weight of two hinged panels vs the current three might make things easier to move around. It would also, of course, mean building more cabling and another panel frame mount.

Any relevant wisdom would be greatly appreciated.


BTW, what is it with the spell-checker on this site? I don't think I made up any new words today. It seems to red underline several legitimate words as well as much of the jargon I would expect used on this site....

packrat1969 asked
Wildebus answered ·

3 Answers

Syncing MPPT & 150/70 Ve.Can


I still have an issue with a new 250/85 going to float to early. It is in a parallel with a 2 x 150/70s connected with VE.Can. Will I be able to sync these with a GX device ( or Pi running Venus)using the VE.can ports and ? They all Bulk charge together, but the Absorb time on the 250 is not long . The batteries are charging nicely however.

JDM asked

0 Answers

Quattro 48/1000: combining 1 battery bank to 4 quattro's: 3Phase + 1 Single phase

Dear all

Can I expand an existing 3phase Quattro system with 3 quattros 48/10000 and 1 battery bank with an extra single quattro 48/10000 for an extra single phase load connected to the same battery bank.

Thanks for the feedback


FandM asked
Jwfrary answered ·

2 Answers

Orion TR smart 12/12 30 inhibit for battery parallel solenoid use?

To use this product on a motorhome with a manual battery parallel solenoid, is there a way to automatically disable the Orion whenever this solenoid is activated (+12V to coil)? I assume running the Orion with input/output shorted is unwanted. The Orion Manual mentions "remote ON/OFF" and "engine detection override", but no inhibit method. Looks like connecting L to +12V might do the job? Can I also use Orion ON by engine ignition +12V at the same time? I need to have orion in stand-by with no draw when engine is off.

Perhaps the logic of connections L and H should be fully explained.

3dYM asked

0 Answers

Wire 2 Orion DC-DC Converters in Parallel

I see in the manual for my Orions that up to 5 units can be wired in parallel. I'd like to put two units (70 amps each) in parallel. Can someone look at my wiring plan and let me know if this is correct? Thanks for the help!


miami337 asked
Paul B answered ·

1 Answer

Connecting Multiple Victron SmartSolar MPPT to one Battery Bank

We have a customer who currently has 2 x Victron Smart Solar MPPT Regulators... Both feeding a single battery bank - he also wants to now add a 3rd to the system feeding the same battery bank.

This is only a small system (e.g. MPPT100/15's) - and I know he could just get one large MPPT - however this is not the desired outcome due to different aspects / shading etc.


I have been searching and found that there are a few conversations similar to this however no rock solid answers so I have the questions:

1. Is the functionality available yet (July 2019) for the two (or 3) MPPT Regulators to work efficiently in parallel synchronising their charging algorithms rather than one switching off prematurely?

2. What information do the MPPT Regulators "share" with each other if connected via VE Direct Smart Network?

3. Will VE Direct Smart Network communicate exactly the same as using the Cable? Or are there limitations?

NCPW asked
Wingphil answered ·

3 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
JohnC answered ·

1 Answer

Easysolar 12/1600 install in a van, panel wiring and LiFeYPO4 settings


Bought into Victrons sales speech for Easysolar 12/1600 product for a van project, but it seems some things still remain unanswered. I've read the manual and done the search. This setup will be used year round in different locations, some shaded some not and temperatures will vary mostly between -5 to +25 celsius. I will be living off-grid full time in the vehicle, so i opted for what i believe is a quality product from a European manufacturer, and i really want to like it.

Being that solar power is somewhat of a new option in the energy market (for the average consumer i mean) and it's popularity will grow together with the advance of battery technology. I find that that the manual and available information for a product labeled as Easysolar is lacking. I really think Victron is on to something here, but the documentation needs to be improved.

Ranting aside, to avoid frying my expensive gear and to get this right the first time, i have come here at the fountain of knowledge to be assisted and educated. So please take time to read this post thoroughly.

My setup will be:

Easysolar 12/1600

3x GWL SunnyPoly 165w panels

12v 260ah LiFeYPO4 winston battery with BMS123Smart for monitoring (link is to 200ah battery, otherwise specs should be similar)

Now for the list of actual questions:

1. Series or parallel panel wiring:

-I am under the assumption that parallel wiring would be better for shaded areas, but series better for more challenging conditions. So far I'm going for parallel wiring, will this work? Do i have enough voltage coming out of the paralleled panels to charge my system when in less optimal conditions? Is there a reason i should consider series?

2. If wired parallel, where to connect:

-there are inputs for 3 strings of panels on the Easysolar, is there a difference whether i connect the panels parallel in the roof and come down with one set of connectors and wires or is it better to wire and connect all 3 panels separately? I am inclined to wire them separately just because it would seem more serviceable and more robust to have less connectors and all 3 panels having their own set of cabling all the way from panel to the CC, this make any sense?

3. Inverter/charger settings

-i do not have any kind of color control monitor or such, i only have one VEdirect to usb -cable which i gather is not compatible with the inverter/charger portion of Easysolar but would need a VEbus to usb cable(?). However, when i check the manual page 16 for the table for dip-switch operable voltage settings - there is no setting for lithium batteries to be found at all? What settings do i NEED and HOW to set them now (with either dip-switches or by acquiring the VEbus-cable)?

4. Charge controller settings:

-now this one seems to have a rotary selector for LiFePO4, so that's something that is finally Easy as the name suggests. Apart from flicking the switch to seven is there any additional settings i NEED to change in order to keep my battery healthy? I quess this would be done with the VEdirect to usb cable and a computer then?

5. Is there anything else i need to reconsider before going with this setup?

-i've already acquired the gear mentioned above and will install these in the coming weeks. This will be the single most important aspect of my van, so i would like it to work since it will be a pain in the ass to redo once the project is finished.

Thank you for reading this far, please reply if you have an answer to one of my questions.


MHakulinen asked
Alexandra commented ·

2 Answers

Is it posible to connect on parallel a Phoenix multiplus 24/3000/70 and a multiplus 24/3000/70?

Is it posible to connect on parallel a Phoenix multiplus 24/3000/70 and a multiplus 24/3000/70?

Abel Ivars asked
Abel Ivars commented ·

1 Answer


Something special i should think about with follwing setup
MPPT 75/15 parallel with MPPT 100/20


swordoski asked
Matthias Lange - DE commented ·

3 Answers

Configuration of 2x Multiplus II 5KVA in parallel (single-phase) ESS system. 5KW appliance is only to be used on battery power when batteries are above 90% SOC and up to 2hrs before sunset.


I'm hoping for some different points of view on how to configure my ESS system so as to arrive at the optimal solution. There is a 5KW appliance(hot tub) that I only want to run on solar power(whenever excess solar power is available) or grid power(when someone manually decides to turn on the appliance).

My thoughts are to configure the ESS through assistants to:

"Power the hot tub through ACOut1 when batteries are above 90% SOC and up to 2/3hrs before sunset." The 2 hrs before sunset is to allow the batteries 2hrs to get up to 100%.

In this case, I would need to also connect the hot tub to ACOut2 so that if a person is to turn on the hot tub and the above conditions are not met, the hot tub would be fed from the mains grid not battery power. A backfeed contactor would first/simultaneously disconnect the hottub from ACOut1 consumption using a relay.

Does anybody have any better suggestions?

The system spec:


2units -Multiplus II 48V 5000KVA (running in parallel mono-phase)

2units - SMART Solar MPPT 250/100 VE CAN

36units - solar panels (11.5KW of generation power, 2x panel arrays of 18 modules)

12units - pylontech US2000 2.4KWh 48V Lithium modules

*Self-consumption only, no feeding back to the mains grid

The goals of the system:

To reduce the monthly electrical bill from mains electric, while still achieving a 12-15 year lifespan for these batteries.

SparkPoint Solar asked
SparkPoint Solar answered ·

2 Answers

Equalization for parallel controllers

I have 4 MPPT 75/15 controllers fed from 4 different panels on my boat which go to one battery bank. When I go to equalize do I just do it from one controller or do I have to turn on the equalization on all controllers at the same time? If I just do one would it harm or cause a disconnect from the others due to the high 16.2 volts?

Thank you, Richard

berwick asked
berwick answered ·

2 Answers

What is the deal with the MultiPlus Compact, vs. the Multiplus II?

I've been told by a seller (and found it here too), that the MultiPlus-II is the newer version and will most likely be supported for longer, since the Compact is being phased out. Is this correct?

I was planning on buying a 2000W (or even just a 1600W) model, and for backup reasons two of them, rather than one 3000W model. The Multiplus-II however is not available in the lower wattage versions. Wonder why, if the Compact units are being phased out.

Am not to keen on buying a "phase-out" product. On the other hand, they are known for reliability, as far as I can tell, while the MP-II might not have proven the same reliability yet.

Are lower wattage units of the MP-II planned, or will Victron just not serve the market for smaller wattage units with the ability to parallel the units any more?

BatteryB asked
BatteryB commented ·

3 Answers

Running 2 x Multiplus 2 48/3000 in a single phase setup with ESS

Hi, I am having toughts of running 2 x Multiplus in paralell with a single phase system, and maybe expanding up to a total of 4 later on. Using 1 source of single phase AC (230V) from grid.

I have a couple of questions:

  1. When running ESS, can both Multipluses feed back into the grid (doubling the normal feedback contra using only 1)?
  2. The transfer switch when grid is on, will that be "duplicated"? When I use 1 multiplus, the transfer switch is 32A when grid is connected. When I use 2 in paralell, will I get the same as 2 x 32A transfer switches? Or is there something im missing?
  3. My phase coming into my house is fused with 63A, therefore I would like to use as much as possible from that before supplying from battery (powerassist). So using 2 x 32A fuses (1 for each multiplus) should in theory give me 7360W pr multiplus of grid use, and 2400W of non-grid use? Or did I misunderstand the concept of transfer switch?

    Thanks in advance :)

lassestu asked
Obay commented ·

1 Answer

Can you mix Victron buck boost converters in parallel?

Was looking at doing a 100a and 50a buck boost converters in parallel. Assuming all the settings are matching and cable runs are equal, can this be done?

Cory Wikel asked
Cory Wikel commented ·

4 Answers

how can multiplus 1 be used as charger in combination with a multiplus 2 as master and one gx?

I have a mp1 5000/48 and a mp2 5000/48, is it possible to run both in parallel on on battery, or at least to use the mp1 to increase the battery charging power?

gnagflow asked
gnagflow commented ·

3 Answers

2 Multis in Parallel

My system:

2 x MultiPlus 48/5000/70-100

8 x Delta Gel Batteries GX12-200 (12V, 200 Ah)

48 x 150W Solar panels

2 x BlueSolar MPPT 150/70-Tr/MC4

Color Control GX

My problem: 2 parallel units from time to time a few times a day switch to inverting without any reasons all of a sudden and sometimes are overloaded, when the real load is 2kW only – that’s what I call “moments of instability”.

I have unstable weak AC input (house is in village with rather weak transformer, which cannot quickly sustain stable voltage when someone switches on high load more than 2kW).

When I had only one Multiplus and updated it with the latest firmware 3 years ago, it started working excellently without overloading itself and without switching to inverting every time I switched high load. It worked perfectly until I had to upgrade the system and installed the 2nd Multiplus in parallel last year. Even now when I experiment and use only one Multiplus after programming it to standalone mode, it works perfectly. But when I use 2 units in parallel – my system keeps on switching to inverting – not all the time, but from time to time. And in these moments of instability I sometimes see that power, taken from my batteries, reaches 6kW – that’s what at least shortly indicated on CCGX and in reality it can be much more. This is crucial for my batteries and 2 out of 8 are dead by now. Yesterday I checked voltage on each battery under 1kW load: 2 indicated 10 V, others – 12.1V. So, I am prone to think that instable parallel work of Multiplus units caused death of batteries, since they are not intended to work in mode of sudden short and relatively high load, which all of a sudden occurs during these moments of instability.

I carefully read everything written here:

My system is up to date, all AC wires between Multiplus units and joint point are equal in size (2.5 mm^2) and length (750 mm) – yesterday I replaced 6 mm^2 wires with 2.5 mm^2 , trying to avoid over-dimensioning , but it did not have any result.

Dear Victron team – please admit that parallel systems were not supposed to work with weak AC input and I should replace my 2 Multis with one Quattro for 10 or 15kVA. I do not know what else I could do - everytime I wait for the new firmware with hope that it will solve my issue with parallel units as it did 3 years ago for stand alone unit, but all the last firmware files, including 2624473.vff, make no difference.

Alexander Ushakov asked
Alexander Ushakov answered ·

1 Answer

Quattro grid parallel with backup generator

Hi all,

We are about to move into quite a remote house which we know the area is effected by grid failure, plus i would like to be able to run mostly from a stored solar system. My intention for how i would like the system to work is that during the day, PV will charge the batteries and power any small loads (We will both be at work so don't expect much draw here). In the evening i would like the house to mostly run off the inverter and batteries. When/if the batteries get to 40% SOC, i would like it to swap back to grid power. (There is once sentence in the ESS that states when battery power is not available, the system will buy from the grid). I would also like this to be the case when the power demand exceeds the inverters capacity, i would like it to be either topped up or swapped over to grid power, is this possible?

If it gets to a preset time, say 6pm and the batteries aren't at say 60% SOC, then i would like to set a charge condition that the charger will kick in from the grid supply, in case of grid failure (I know this is possible from the ESS manual)

If grid failure occurs, and i discharge the batteries to say 10%, i would then like the generator to be auto started to charge batteries/run loads (Again im fairly confident from reading manuals that this is possible)

I don't intend on using the AC-OUT2 on the quattro as we wont have many non essential electric loads, No AC, Oil fired heating and hot water ect.

I have attached a quick diagram of my intentions below. To reiterate, i guess my main questions are;

If grid power is available, but the quattro is working from batteries, is it possible to set the quattro to power the loads from the grid once the batteries reach a set SOC? The ESS manual refers a lot to disconnecting loads at certain preset SOC's, but i just want it to power from the grid instead of disconnecting loads.

The second is in the case of overloading the Quattro inverter, when grid power is available. Will it top its current capacity up with grid power? Will it switch to purly grid supply instead and bypass the invertor all together?

Can the Cerbo and touch 50 run ESS? They arent mentioned as compatible in the ESS manual but i assume the manual is older than the products? Also, is it possible to run two touch 50 displays from one Cerbo? So i could have one by the setup in the garage and one in the house?


Thanks in advance


Rich. asked
Rich. commented ·

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