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48v battery

Charging a 48V lithium battery from a 12V battery.

Hi all. My currently solar setup on my campervan is as follows:

250W PV > 30A charge controller > 12V leisure battery.

I have just bought an E-bike which runs off a 48V lithium battery that I would like to be able to charge from both the solar panel and the 12V leisure battery (when charging overnight). My current charge controller can only charge a 12/24V battery so am looking at buying the Victron 100|20 controller that can charge a 48V battery.

- If my solar panel is only pulling in 30V, will my 48V lithium battery still charge?
- Can I charge my 48V battery from the 12V leisure battery without using an inverter? If so, what do I need to do it safely?

Many thanks.

ali-paul asked
Vance Mitchell commented ·

2 Answers

Battery Switch ON/OFF 275A

The Battery Switch ON/OFF 275A 12-48V

Can i use it in a 48V system with a Multiplus II

jens-due asked
marekp commented ·

1 Answer

Multiplus in ESS mode aansluiten op Belgisch net voor thuisbatterij.


Ik heb thuis een multiplus II GX aangesloten op het Net met een 10Kw lithium batterij.

Alles in mooi aangesloten zoals het in de manual beschreven staat en het systeem werkt ook gewoon perfect, Maar nu is de keuring langs geweest om het systeem te keuren en dat wilde hij niet doen omdat de omvormer in serie was aangesloten met het electriciteitsnet en niet in parallel. (Ik vertelde hem dat dit systeem enkel maar in serie kan worden aangesloten en dat alle meet apparatuur vanbinnen in de multiplus aanwezig is, en dat dit toestel aan alle veiligheids voorzieningen voldoet en gekeurd is door Synergrid belgie)

Kan iemand mij helpen met info of voorbeelden van iemand anders die dit ook zo gedaan heeft thuis, zodat ik dit kan voorleggen aan de keurder? Of heb ik zelf iets over het hoofd gezien?

In bijlage de schets van hoe het is aangesloten:



Met vriendelijke groeten


aaroncloet asked
Daniël Boekel (Victron Energy Staff) commented ·

6 Answers

24V system MPPT

Good day,

Regarding a 24V system, what does the MPPT manual mean by the following indicated in bold below?

"3.3 PV configuration (also see the MPPT Excel sheet on our website) ● The controllers will operate only if the PV voltage exceeds battery voltage (Vbat). ● PV voltage must exceed Vbat + 5 V for the controller to start. Thereafter minimum PV voltage is Vbat + 1 V. ● Maximum open circuit PV voltage: 150 V or 250 V, depending on model.

For example: 24 V battery, mono- or polycristalline panels, max PV voltage 150 V: ● Minimum number of cells in series: 72 (2x 12 V panel in series or one 24 V panel). ● Recommended number of cells for highest controller efficiency: 144 cells (4x 12 V panel or 2x 24 V panel in series). ● Maximum: 216 cells (6x 12 V or 3x 24 V panel in series).

48 V battery, mono- or polycristalline panels, max PV voltage 250 V: ● Minimum number of cells in series: 144 (4x 12 V panel or 2x 24 V panel in series). ● Maximum: 360 cells (10x 12 V or 5x 24 panel in series)"

Is 24V charging capped at 150V? (even with the 250V series)

hdp asked
seb71 answered ·

1 Answer

Off Grid 48V System options


Sorry if this is a bit long winded, I would appreciate some advice on Equipment selection and Integration for a 48V off grid system. I have been going around in circles Googling youtubing etc on Victron, Solar, Batteries etc.

I am going to be living temporally in a farm location whilst Renovating a Barn for a future house and also setting up a Camping/Glamping/Cabin site. This is all in the same Farm Location.

The 48V/5000 Multiplus 2 (GX ?) seems ideal as I can feed with a generator if required supplying 2 x Ac outputs and also feed via an MPPT from Solar (20 x 370W ish of Ground mounted Solar giving around 7 to 7.5 KW) and with Lifepo4 Batteries.

I have narrowed MPPT options to the 250/100 or the MPPT-RS ?

The advantages of the 250 is it is Multi Voltage and I could use Later in a 12 or 24V Camping setup with Some of the Panels. However it is limited to 5800W.

The RS can use more Solar and it has 2 x MPPT Trackers (2 x serial strings of 10) Disadvantage 48V and more expensive.

I would like to top up a water heater if the system is full (load shed?)

Looking at a couple of Friends rough Data (from a 6KW and 50Kw grid systems it seems the more Panels the better for the UK winter.

For Batteries was thinking of a 16s 280aH aliexpress type, but BMS selection seems to be a nightmare looking at all the reviews.

In my Understanding of this could I use a BMS to balance the Cells and the Victron setup to deal with the high and low voltage and temp sensors.

From online it seems some are using the BMS to deal with the total load, I don't know why.

Could use an expensive decent BMS if required.

I would consider Pylontech Batteries but they are more expensive and I would like to learn the system.

In addition the 16s cells could be later split to create 12V or 24v for the Camping area (to match the 250 MPPT).

Really it is the Integration and communication with the Kit I need help with, plus brushing up on my theory.

For Instance am I better off Having the Multiplus and a Cerbo or a multiplus GX, do I need a battery Monitor? or which one would one be better over the other in terms of temperature sensors and relay outputs for generator etc. (I don't want multiple items capable of doing the same thing)

The system will be located at the top of a hill around some old Barns so was considering a small wind turbine in the future unless its too much hassle.

In an ideal I world not have a grid connection for my future house (or just export/ use as much as posssible) so I could use the system or expand it for this.

This is a big learning process... and I am an Electrician ! (Never been involved with Generators, Solar or Battery storage though)



Andy F asked
Andy F answered ·

2 Answers

Quattro settings for lead acid batteries 48V

Hi all, I have a system made by Quattro 48V/10000/140, two MPPTs Smart solar, 48 V floade lead acid batteries, 755 Ah (C5) SG tested and ok by manufacturer. But I never had energy from batteries during evening/night despite voltage was above DC restart... You can find attached a PDF with settings of quattro and an image with assistant settings. Please tell me what is wrong...SET.pdfImmagine 2021-02-07 182526.jpg

lorenzo-accaroli asked
lorenzo-accaroli commented ·

4 Answers

Specific gravity VS CCGX voltage readings

Hi everyone, actually I have a TAB battery floaded lead acid battery (48V 24cells 775Ah(C5)). The fact is that... It's a couple of days that I check Sg of the cells in late afternoon when MPPTs chargers are in foat or even off status. Today I read 55V on CCGX but sg give is 1.25. My battery dealer told me some weeks ago that to have the voltage i have to add 0.84 to sg readings, so today 1.25+0,84= 2.09 V/cell, that gives 2,09x24=50,16V... 5V less than the reading on CCGX! why does it happens? I don't have BMV nor shunt. Inverter is off.

lorenzo-accaroli asked
Alexandra edited ·

1 Answer

Narada battery setting

6V&12V operation manual copy.pdf


lets give a full details of the system configuration

Easysolar 5kv

BMV 712 smart

3 Battery balancer

9 X 375wat solar panels

3 string 12v 200ha Narada 313F HTB " I'm attaching the operation manual "

my concern is charging current setting for 48v system 25c

Float 54.40v / Equalization 56.4 this is according to operating manual

no details any where in the user Manual regarding Absorption charge current noticed, what would be the most suitable charge current, noting the max discharge is 10 -15% of the battery capacity regards .. ishtiaq

ishtiaq asked
alan edited ·

4 Answers

Combine 2 3-phase quattro hybrid generators

I have a 30kW Hybrid unit including DC generator, 48V Li batteries, 3 x 10kVA Quattros in 3phase. The inverters are in inverter mode only and do not charge the batteries, the generator charges the batteries, controlled by a PLC. The inverter configured to cut off at low voltage setpoint.

I'd like to combine two of these units to serve a max of 60 kVA load , 3 phase.

Can I AC couple these systems ? Connecting inverter 1 of each unit to phase 1, etc. so I'd have 2 inverters on each phase, 20 kVA per phase?

Is this possible ? How would it be configured software ?

I realise normally two DC batteries can not be used if not on same DC bus, but does it matter if the inverter never charges the batteries ?

energylad asked
alan commented ·

2 Answers

MeterBoost 48V - 82Ah - 4,2 kWh lithium battery, anybody experience with these?


I came across Meterboost 48V - 4,2 kwh batteries, Portugese made and cheap (with BMC). On there website they make reference to Victron. But can't find any information about connecting these batteries to a Victron's Multiplus (did Victron already test them)?

Is there anybody out there that has any experience regarding connecting and using these batteries? Love to hear your remarks!


robertg66 asked
Paul B commented ·

2 Answers

Charging 48V batteries from alternator


It's been some time now that I'm trying to find a solution for my next van installation.

I first came with this diagram with 2 victron 12V LifePo4 (24v): https://community.victronenergy.com/questions/65042/wiring-diagram-for-a-van-install-with-multiplus-ii.html

Now I would like to use the Pylontech 48 V batteries and a Multiplus II 48V/3000 for efficiency, price, form factor, ...

I searched for a 48V buck/boost around 50/100Amps and found nothing affordable and easily available. I do not want to install a second 48V alternator... At least not at first, I have a strong 250A 12V alternator.

The basic schematic would be as follow:

- A "small" inverter under the hood would allow to feed the Multiplus at the rear of the van without needing big wires (and losses).

- The inverter would be activated with a D+ signal to avoid discharging the start battery

- The installation would be very simple

- I could easily "tune" the amps drawn from the inverter with the AC input current limiter of the Multiplus

Is it possible ? do you see any problems with this kind of setup ?

Thanks !


Basic diagram without solar, Cerbo GX etc etc etc.




sebcbien asked
danhig answered ·

3 Answers

What charge controller for 2 panels and a 48V battery bank?

Looking to size a Victron Smartsolar Mppt controller to two LG 375 Watt panels in series, feeding a 48V lifepo4 battery bank bank.

RIght now my calculations tell me I need a 20 amp charge controller, however Victron does not make a 20 amp controller that supports a 48V battery bank.

Looks like Victron makes the MPPT 150/45-Tr amp but it does not look very common or available. the next up is the SmartSolar MPPT 150/60-Tr.

What would be the best smart controller to run this set up?

Thanks P

brasstacks asked
brasstacks commented ·

1 Answer

48v vs 24v off-grid US

Hello all. Looking for advice as I build my off-grid system for my tiny home. My current dilemma is that my batteries can be configured as 24v or 48v systems, and not many of the 48v systems are configured directly for US, split phase.

Option 1 is use the batteries at 24v and use an inverter/charger(quattro probably), adding a second unit for split phase in the near future.

Option 2 would be use the batteries at 48v, with a EU inverter/charger run it at 240v, plus an autotransformer.

Is having a 48v system worthwhile in terms of longevity and efficiency to justify the slightly more complicated system? I'm also not sure how I could charge my pack with a 120v inverter generator through a 240v configured inverter, when I need generator backup. I like the idea of having the autotransformer in the long term anyway to balance loads for split phase when I use tools, but the AC charging from a generator is the biggest unknown to me right now.

bdale asked
mt-geek answered ·

1 Answer

Why so few 48V mains chargers?

Hi everyone,

It does seem a bit strange that there are so few 48V mains chargers available given the fact that there are a plethora of 48V solar mppt charge controllers and 48V inverters. Aside from the large Victron Skylla chargers, there are basically NONE! And I don't just mean Victron, but across the board aside from some awful Chinese offerings that is...


hardwarepimp asked
Daniël Boekel (Victron Energy Staff) commented ·

3 Answers

DC/DC - 48v to 24v conversion + buffer battery?

I am in the process of spec'ing out the power electronics for a large sailboat. For various reasons, it will have a 48v LiFePo4 bank where the majority of charging sources come in, as well as the inverter/charger, and then a 24v buffer battery where most of the DC loads will draw from. It looks like the total 24v DC power usage will be around 10kwh per day, but with loads like electric winches or windlass potentially spiking temporarily to 3.6kw (~150A)

My first question is this - what is the proper way to handle this conversion? The only 48/24v dc/dc converters I see on the site are the 'dumb' Orion DC/DC chargers that go up to 400W. It looks like we'll need about 500W/hr of charging to keep up with demands, and an extra converter for redundancy (absolutely cannot have this fail at sea!) So it looks like 3 x Orion 48/24v converters in parallel?

Secondly - the buffer battery will be a Victron 24v 200ah LiFePo4 smart battery. The DC/DC converters seem to be configured to just output a steady voltage. Does this buffer battery need to be supplied with a 'smart' charger to give it exactly the right voltage to fully charge, or can the converters be set to a safe voltage and just keep it mostly charged?

hoeken asked

0 Answers

Options for battery balancing 48V bank of 8x 6V batteries

The Victron battery balancer works with 12V batteries. Handling a 48V bank would take 3x balancers.

But, what about a bank consisting of 8x 6V batteries ? Our bank is 8x Crown CR-430 430AH batteries ...

halfwalker asked
robert-martin answered ·

3 Answers

Einstellung Nasszellen bei EasySolar 48/5000/70-100 MPPT 150/100 Color (Ladeprobleme)


ich habe 4x12V 225Ah Nasszellen angeschlossen, aber die Ladereglung klappt nicht, die Zellen werden in relativ kurzer Zeit immer schwächer (Säureheber) obwohl die Anzeige 100 % zeigt.

Bitte Info, wie die korrekte Einstellung vorzunehmen ist, denn den 1. Satz Akkus habe ich vorsorglich schon mal getauscht, um die Zellen auszuschließen.

Verhalten ist beim 2. Satz genau gleich.

jorabo asked

0 Answers

MPPT 100/20-48V or DC/DC converter, to Direct Solar Charge a laptop via car-lighter ?

Hi, I'm using the 100/20-48V MPPT to charge my 48V bike (54.6V 10A). it's working great! I'm starting to source flexible panels to make a portable setup to carry onto the bike when riding :)
the 'prototype' setup looks like that at the moment.. :-)


Also, I'd like to use the same setup to charge my other 12V devices (laptop, phone, light, fan, etc..).
So I decided to use a car lighter... it looks like that.


right now, it doesn't work. But I don't know if it's just a problem with the Gissaral 90W charger with a surface connect port at the end (I tried it on a car and didn't work either. I'm gonna send it back anyway), or if there's something wrong in the setup...

My questions are:

- Is it OK to use this kind of car charger after the MPPT like this? (using the MPPT as a DC/DC converter I guess?) or do I need to use something else than the MPPT ? (and if so, what?)

- Is there a way to safely and quickly change the MPPT setup in the app, for switching between my 48V and 12V presets ?
- Is there hope that the app will work using windows bluetooth ?
- maybe not disconnect between each time I take a look at the app ?
- Basically, are there useful updates to the app coming ? would be great!

Also, suggestion:
"We" (I?) need an outdoor/waterproof version of this MPPT :-)

Thank you very much in advance for your help! :-)

coin3ip asked
coin3ip edited ·

2 Answers

48V Nissan Leaf Lithium Battery Pack 14S with 30A BMS


Capacity (when new): 3.5KWH

Fully charged voltage: 58.8V

I have 8x 250w solar panels 37.2 voc

4x 100/50 victron SCC

whats the best way to build this system?

Wayne asked
Wayne commented ·

1 Answer

Skylla Titan 48/25 with Gel battery bank, powered by 240v generator

The Skylla Titan charger comes with factory set values. My understanding is gel batteries shouldn’t be equalized. The charger IUoUo characteristic is 3 stage, boost, equalise, float.

My question is, should the equalize stage be switched off with these batteries? In The manual, it’s called equalize-charging mode. Options for 0, 4, 8, 12 hrs before switching to float. Factory setting is 4hrs.

If set to zero, it would then go from Boost to float before fully charging? Is that correct or is the equalise-boost meaning absorption?

Or keep 4 hrs and it will finish the last 20% of the charge with reducing voltage (not an over charge)?

Hopefully it all makes sense.

Thanks, Mic

micvw asked
micvw edited ·

0 Answers

Inverter maximum battery capacity

Could someone be so kind as to tell me the maximum battery capacity that both the 48v 3kw and 5kw multiplus inverter charger can handle? (Intend I’m using Pylontech 48v us2000).

merlin asked
merlin commented ·

2 Answers

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?

srobinson asked
srobinson commented ·

1 Answer

MultiPlus Quattro Inverter Charger

Hi. I have a 48/3000 multiplus. In the technical book it is written that the maximum input voltage = 66V DC. But when it reaches 64.7V it stops. How can I adjust it to work up to 66V. Thank you

ciprian-dobrescu asked

0 Answers

24v cells in series out of sync in 48v system, can 2 MPPT controllers balance?

I have 2 24v batteries connected in series for a 48v system but one of the 24v is getting more charged than the other. Currently I have 2 150/35 MPPT controllers in parallel charging the 48v battery and it's monitored by a BMV-712 which needs to be the only thing connected directly to the negative 48v terminal to track the current in & out. The negative terminals for the solar panels & the MPPT controllers (both for solar in and the other for battery out) are connected to the chassis (to reduce loss from heat/save wiring, this is in a motorhome - side question: is this helping or hurting?).

  1. If I connect the +/- terminals of one 24v battery directly to the +/- of one MPPT controller (and do this to the other 24v battery too), will this work or short? If so, how is the + terminal in the middle (of the 48v set) connected to the - of the other battery protected against a short when that - terminal is connected to the - of the MPPT controller?
  2. Should I use a battery balancer for this issue instead?
  3. Whether balancing with a balancer or using the MPPT controllers on the individual 24v batteries, how will the BMV accurately track current unless it's the only thing between the battery and ground?

deeperid asked
JohnC answered ·

2 Answers

Battery Discharge more than actual loads

Good Day

We have come across this issue on our one Victron Installation. The loads that gets used is less than what the battery reports it is giving out.

Is this something to worry about?

how can this be fixed?


sectorsolar asked
Alexandra commented ·

6 Answers

Quarto 48V 10000VA 140A 230V AC quarto

Hi everyone,

I am a power engineering student and I am looking into the inverter model Quarto 48V 10000VA 140A 230V AC quarto. Its used within a project by NPG called Silent Power. I am new to this so I am tying to get as much information to understand the inverter. I've looked on this site but I am finding it difficult to pick out the correct relevant manuals and technical information. Could anyone please help.

Kind regards,


drossy88 asked
Matthias Lange - DE answered ·

1 Answer

Batterie Balancer and charging AGM slow discharge batteries on a 48V bank of 4x12V


Being new here and after searching the forum, I didn't find an answer and I am looking for some help. Thank you very much for your time and answers.

I am planning to wire in serial, 4 Hankook 12V - 65Ah to get to 48V in order to drive through an Alltrax SR 48300 controller a DC Motenergy ME0909 Motor ( 48V - 100 Amps ).
1) Is it a mandatory to use Battery Balancers (like BMV-702 or 712 ) in a serial AGM Battery Bank ( 4 x 12V ) as I have read somewhere that AGM batteries don’t need equalization ?
2 ) I understand these batteries balancers work when charging but do they work also when running the motor and therefore discharging the batteries ?
3) What is the best way and easy way to charge these batteries ? Is it by charging them one by one with for example a Blue Smart IP22 ( 12V ) or directly with a 48V charger like a MEC ( 48V Charger )

Thanks again

louis asked
warwick commented ·

2 Answers

Off-grid Multiplus II + SmartSolar MPPT system monitoring


I'm planning an off-grid installation with four solar panels, a SmartSolar MPPT 100/20 (48V) and a MultiPlus II 48/3000/35-32.

I'm wondering how I could monitor my system and I see (at least) two options:

1) Raspberry py

In this case I'd need to get:

  • UTP cable + MK3-USB interface to connect MP II to the Raspy
  • VE.direct cable + VE.direct to USB interface to connect the MPPT to the Raspy

Is that right? Or can I connect the MPPT directly to the MP II? In the latter case I don't need to buy VE.direct to USB interface

2) MultiPlus-II GX 48/3000/35-32

In this case I'd need to get only:

  • VE.direct cable from MPPT to MP II GX.

Is that right? As MP II GX has only one VE.direct port, is there any other way to connect MPPTs to it, in case I will expand my system?

Do I really need MK3-USB interface with MP II GX? What's the purpose of USB port??

Which option do you suggest?

Sorry for the large amount of questions and thanks in advance for helping me to have clear ideas :-)


the-salmon asked
the-salmon commented ·

1 Answer

10kw system plan, Please help!

Hello all,

I'm new here sorry if this question is redundant.

I'm building an offgrid system. I will NOT be selling power to the grid. I want to get an inverter/charger that's good enough so i can eventually add more panels and more batteries without having to get new ones and re-wiring all the time.

I was thinking on going with 2 3648a outback prewire inverters but I like the apps of Victron and outback is not available here.

  1. I want a 10kw system
  2. 48v to 60v system.
  3. 10x 500 watts panels from china ( another 10 later)
  4. 3 x Tesla smart lithium ion batteries ( 57v 2.5kwh) , I plan to get 11 of these.
  5. Victron charger controller and inverter

Questions are:

1) Which inverter/s should i get?

2) 250 charge controller will be enough?

3) Quattro or Multiplus?

4) Will the Victron inverter work well with tesla smart batteries?

offgridwolf asked
Anita answered ·

4 Answers

Multiplus 3000 with a pump Pedrollo 4SR6m/13

We've just installed a MultiPlus 3000/48 to run a pump Pedrollo 4SR6m/13 (https://www.arrosage-distribution.fr/pompe-4-sr-6m-13-pedrollo-6198.html). The pump is rated at 1500W, but seems to pull more like 2300W.

However the Color Control indicates that we're pulling 2877W from the battery, but only supplying 2277W to the pump. There is also a 148W dc load (the inverter?) So where is the 450W going?

Of course at 2900W the Multiplus gives me a overload warning, and after a half hour shuts off with an overtemp warning on the Color Control.

The only solution I've come up with for the moment is changing the Multiplus 3kw for a 5kW, but would hope to find another solution.

tieole asked
Murray van Graan answered ·

1 Answer


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