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Setup of IP44 charger with BMS

Hi everyone,

I have a new install with Victron 12v 150ah smart lithium batteries along with an IP44 charger.

I am using the victron mini bms to control the charge disconnect remote port on the IP44.

Question is " in the Skylla IP44 setting there is a spot where you select BMS present- Y or N."

Do I select yes or no. Or is this only for CAN connected devices



mrplick asked
s_v Simbora answered ·

1 Answer

Multiplus 12/3000 120- shutting off

My 3000 will charge my lithium batteries fine thru all the steps, bulk, absorption, and then float. Once it reaches float it will actually go to Off when I view the app It then will start back up on it's on. Sometimes in absorption mode, sometimes in bulk mode. Anybody know what can cause this and will this lead to bigger problems. How do I fix?

tmsustar asked
RickP answered ·

1 Answer

Quattro 24/5000/120 with 240V split-phase input

I currently have a Multiplus 24/3000, but am thinking of replacing it with a Quattro 24/5000, both for more output capacity and maybe to handle 100A of charging input from a 240V split-phase (“50A”) outlet. As far as I understand, a single Multiplus can use one of the 50A legs but two configured in split-phase mode would be required to handle both legs.

The PDF manual online claims the 120V Quattro can handle both legs of input but that 240V output is not possible off the inverter. That’s fine with me - I only care about 120V. But can it use both legs for battery charging, or is it just something passed through?

My goal is to charge my batteries using both 50A legs if possible. I only have 120V appliances and would prefer to run single appliances up to 3kW - beyond what a single Multiplus can do. If a Quattro won’t help me, then maybe I need to consider a second Multiplus instead. But with split-phase, I don’t think I’d be able to run anything beyond 2.4kW for long, if I understand correctly. Any advice greatly appreciated!

casey asked
casey commented ·

1 Answer

Quick charge option for ESS?

Is there some option (that I might be missing) in remote console (or VRM or wherever) to activate an immediate charge from grid state? I know of the schedule options, but sometimes we (in South Africa) will hear about an impending grid failure (load shedding) a few hours in the future, and the battery SOC might not be as desired ahead of that. It would be nice to have an option to just tell the system to charge from grid right now, perhaps until some kind of settable SOC and/or time limit or so. Let's say my battery is at 50%, and I hear there will be 2.5hrs of loadshedding in an hour from now, I'd like to be able to select a quick charge option, set it to (say) 80% SOC and 55min time limit, and have it start immediately. Right now (unless I'm missing something) I need to add a new schedule to start in a few minutes and it's a lot more keystrokes in a sense to get to what I really want: charge now.

(apologies if this has been asked and answered, I did try to search for something similar, but could not find anything)


multiplus II 5000, 4x 3.5kWh pylontech, 150/100 MPPT, venus GX

gyrovague asked
Guy Stewart (Victron Community Manager) answered ·

1 Answer

DC DC charger settings Deep Cycle Lead Acid

I have just installed an Orion-Tr Smart 12|12 - 30 Isolated DC/DC charger to my Mercedes Sprinter van to charge a West Marine Lead Acid 105 Deep Cycle 'House' battery when underway. I was surprised there was no charge profile available for this device/battery match in Victron Connect.

The Merc has a 270Amp Alternator and my house battery spec is:

105 Amp

20 Ah Cap

MCA @ 32°F = 800

185 RC

Can anyone advise me on a charge profile?

Ted Thornton asked
Alexandra answered ·

1 Answer

Battery protect connection to multiplus

I'm having some difficulty understanding how I can connect the BatteryProtect (12v/65a) with the MultiPlus 12/800/35. The MultiPlus when charging should go to the IN but when it's inverting it should use OUT, you obviously can connect both on the BP. It's says clearly in the manual that you shouldn't use chargers on the OUT terminal but how about consumers(aka the inverter mode) on the IN?

The schematic on the Victron site is way too elaborate to translate to my setup. Can I just connect the MultiPlus to the IN of the BP?

e11enn asked
Paul B answered ·

1 Answer

Skylla-i 3 outputs with Charging Alternators

I saw my client using a Skylla-i 24/80 3 outputs charger to charge 2 nos. of separate engine stater battery banks. Both engine also has a charging alternator connected to their respective starter directly. Both engine may or may not run at the same time. Is this type of configuration compatible at all?

Tan Tiong Teck asked
Paul B answered ·

1 Answer

Multiplus Compact not charging, inverting & no 120V.

Our 12/2000/80 Multiplus had been working fine until ~5 days ago. Now only the alarm LED light is on, we have no 120V AC at the outlets but still have 220V on shore power. The BMV 800 is reading 12.6V and our SOC is down to 59%. The last full charge state was 5 days ago, the day we disconnected from shore power in preparation for hurricane Isaias landfall. Returned next day to reconnect shorepower and no charger/inverter.

Kaikane asked

0 Answers

Charging voltage MultiPlus incorrect?

So I just setup my MultiPlus 12/800/35 with my VE.Bus Smart Dongle. I set de dipswitches to

1=off, 2=on, 3=off, 4=off, 5=off, 6=off

This should give me a charging voltage of 14.7 for my AGM battery, but when I check the app it says it has a voltage of 14.10 (sometimes drops to 14.07)

I did save the settings with switching 6 on and off.

What am I doing wrong?

Also, is there a way to change settings in the app or can you only see data?



e11enn asked
e11enn commented ·

0 Answers

Orion Smart 12/12-30 to charge AGM bank from Lithium battery?

I'm adding a Relion RB300 battery to my electrical system (got it very cheap), and want to use it as a solar "header tank" of sorts. The plan is to charge the lithium battery from solar only, and connect the lithium to the AGM bank with an Orion 12/12-30 isolated charger. All boat loads are connected to the AGM house bank. The solar panels charge the lithium whenever there's enough sun, and the lithium in turn tops off the AGM, probably keeping at or near float all the time.

Question is, is the Orion 12/12-30 isolated the right tool for the job?



davidhoy asked
Bathnm commented ·

1 Answer

Victron OEM Wallbox - Status & features

Dear Victron,

in May i have seen your blog entry presenting an future Victron Wallbox, i was super happy as i would assume that it would make my life way easier in regard to dynamic/smart EV charging as part of an offgrid 3 phase island system.

As the car is now available i have to decide whether i wait for the finished Victron product (which hopefully offers dynamic/smart charging) or go with an DIY solution including extensive programming (what I wane avoid).

Maybe I am lucky and you are already in a state to spread some more infos to the community!?



Janek Plathe asked
Huhu answered ·

3 Answers

VE. Bus BMS with Skylla ip44 via Venus GX

If I connect a VE. Bus BMS (connected to Victron Smart LiFePO4) and a Skylla IP44 to a Venus GX, will the BMS be able to control (disconnect/connect) the charger without additional devices (remote disconnect)? Or, must I use the BMS charge disconnect output?

Paul asked
s_v Simbora answered ·

3 Answers

Seit dem Update v 1.5 meines Ladereglers (MPPT 100/50) vor zwei Tagen, produziert dieser nicht mehr...

Ich bitte um Hilfe! Wenn sie wollen kann ich bilder anhängen... Viele Grüße und danke für ihre Hilfe! Vanessa

Vanessa K. asked
Matthias Lange - DE commented ·

5 Answers

How to charge a 48V system from a 12V vehicle alternator

Hey everyone, First post on here!

We're just in the middle of setting up our Victron system and want to use a 48v system (due to cable sizing and efficiency) in our overlander which has a 12v alternator.

My question is, can the Victron batteries be charged in parallel (i.e each batter individually charged) but drawn from in series?

If so are there Victron products or suggestions on the best way to achieve this setup, there will at some point also be some solar power introduced too, so if that could be kept in mind it would be great!

Any advice/suggestions gratefully appreciated!


James Yardley asked
bigboy529 answered ·

4 Answers

Can i use a Phoenix multi 12/1600/70 for charching a lifepo4 ?

Phoenix multi 12/1600/70 for charching a lifepo4

Rob_B asked
Rob_B answered ·

5 Answers

Split Charging from MPPT through Battery Protect

I have an Autotrail Motorhome with a Sargent Electrical unit that used to provide split charging for my Leisure and Starter batteries.

Last year I had installed the following system:

200amh LifePo4 Victron battery

Multiplus 3kva inverter charger

Victron BMS

Victron BMV712

Victron 200watt Solar Panel AND a SmartSolar 75/15 MPPT Charge Controller

Victron SmartSolar 75/10 MPPT for the original 100watt solar panel (removed the PWM charge controller and bypassed the Sargent Unit)

Battery Protect on the "output" side of the battery / system

Battery Protect between a Sterling Power DC-DC battery charger and Lithium battery

(Sterling charger runs of the starter battery / Alternator while the engine is running)


Can I introduce a "Split Charger" between the once of my MPPT Charge Controllers and my starter battery using the cables already in place (or new cables)?

Which Victron unit would I need? (Cyrix...?)

Thanks in advance


SteveCounsell asked
SteveCounsell commented ·

1 Answer

Atlas combi 12/1500/50 stop charging

I have have an Atlas combi 12/1500/50 that have worked perfectly until last week when it does not charge anymore with landline connected. No lights on the charger lit up, no cirrent and no on liggt. When I remove landline ”equlize” lits up. When measuring voltage it conform that it does not engage charging. F2 fuse is ok. I suspect that the resent thunderstorm Destroyed it. Are there any more fault isolTion to do? Could it be that the lNdline has too low voltage or bad frequiecy that shut it down? Are there spare parts or do I need to replace the whole unit? The converer works fine. Any leads in direction are appreciated. Thx!

Rapid asked

0 Answers

Mppt 7515 green and amber lights are flashing and no Wattage from solar????

Can anyone help me, the amber and green lights are flashing - I deliberately drained the battery to make the solar power charge the battery. The app tells me there is now W coming from the solar panels...really annoying as I cant tell what is going on :-(

qw12as asked
dazey77 answered ·

1 Answer

Charge controller advice


What charge controller do you recommend for 2 solar panels 300W / 24V.

Thank you!

Sorin T. asked
Sorin T. commented ·

2 Answers

Prefer PV MPPT over Alternator DC Charging for mobile aplication.

My situation is this. I have a large PV array 2600 watts running into two 100|50 MPPT charge controllers, I have 2x 3000|24 Multiplus inverters, BMV702 and a raspberry pie connecting it all together running Venus OS. I also have a 260 amp 24v DC alternator onboard that will charge the battery bank and help power loads.

My question is, how can I force the PV / MMPT chargers to always output if there is a draw on the system. I have set my alternator to charge to 27.8v while my MPPT chargers charge to 28.4 (temp compensated) . Often times I'll run two air conditioners, using close to 3000 watts. If my battery bank is not full and the MPPT chargers are still in bulk mode, it will work pretty well with the chargers continuing to contribute to the loads and the battery bank will fill. However once the bank is near full the MPPTs throttle down and the alternator takes more of the AC load, which puts my strain on my diesel engine costing me fuel and power.

With the tools at my disposal here, how can I have the MPPT chargers contribute even if the battery bank is full. I thought a few years ago the DVCC used to work this way and it would trigger the chargers to assist.

Thanks for any help you can provide.

neoneddy asked
dazey77 answered ·

4 Answers

100/50 MPPT settings for Enersys 12T105F batteries

Hi , I have 4 x Enersys 12T105F 105 Ahr batteries in parallel being charged by my blue solarsmart 100/50.

Float voltage is specified by Enersysy as 2.280V pc at 20 degrees C & 2.265V pc at 25 degrees C.

In the smart app ...What should I set absorption voltage to? The temperature correction to? or is one of the presets a correct one to use?

I know that 4 batteries in parallel isn't ideal ,and I will likely change to a 24v setup with 2 in parallel x 2 series and have a 24-12v Orion converter to run my 12v system.

Solar panels are 4 x 250 W setup in 2 strings of 2 in parallel so I have plenty of incoming power.

I have noticed at the moment (with a test load of 25W on 100% of the time) that I reach end of bulk charging in 3.45hrs,Absorption afte 2hrs then into float. Late in the afternoon it goes straight back to Bulk mode....Is this because I have the 25w load running?

ScottM asked

0 Answers

Feature request: Dynamic Grid-Setpoint in ESS, based on top SOC.

Currently the Grid-Setpoint in ESS is a static number (in watts) that controls how much system power is allowed from grid, with the remaining load being served by incoming solar and/or battery capacity, down to a tolerable SOC. While that works great in the assumption of keeping batteries @100%, every day, it’s not so good for long-term health and maintenance of lithium batteries, in a (stable) grid-tied system.

I would like to suggest an upper limit to the SOC (other than default 100%), at which point the ESS would dynamically shift the load more/less (by changing Grid Setpoint) to charge the batteries when they’re below the high mark, and otherwise running the load off of solar or battery capacity, down to the existing minimum SOC (as normal)... or similar type of functionality.

Currently, I’m constantly changing the Grid Setpoint down, to serve the system loads from the incoming solar preferentially, as much as possible. Then resetting it up again at night, to keep the batteries above a reasonable SOC. While workable, it is way more manual than it needs to be.
I believe adding a simple top SOC to the algorithm that controls when to shift to using solar would greatly simplify and automate this process.

Geomz asked

0 Answers

MultiPlus charge settings for third party LiFePO4

I've got a 8S LiFePO4 with an internal BMS (I can't tap into it). For LiFePO4 and other lithium chemistries, I'm used to a CC/CV (constant current then constant voltage) charge cycle. What I would like is to get the MultiPlus to charge at no more than 50A until it hits 28V (3.5V per cell) (then hold that 28V until the charge current drops to 5A. I don't want any float stage or any periodic re-absorb.

Could someone give me advice on how to get as close this as possible?

krby asked
ben commented ·

1 Answer

Can't find the error in my system. BMV perhaps?


I have a Victron BMV-712, the shunt is correctly wired as per its instructions. It worked fine when it was monitoring the drain on the house batteries from the loads, and the charge to the batteries from the Victron mppt 150/45.

My problems started when I added a Victron Orion tr 12/12-30. I set up it's charging profile using the data from the battery manufacturer (Photonic Universe).

Bulk/abs 14.20 Cond. 13.85 Float 13.50

The Orion would never stay in Bulk for more than a couple of minutes, regardless of how little battery percentage I had left. I was at 65% and still it went straight to float, or sometimes absorption for a few minutes then float.

Now I'm parked in one spot I've been plugged in to the mains most of the time. The other day the BMV showed 64% - sounds reasonable, I had been unplugged for several hours, it had been cloudy on and off, and I had used my laptop for gaming which does use a lot of power. I couldn't plug in the next day, so I ran down to 56% - but my heater still turned on. My heater doesn't work unless the battery is at 75% or higher!

So I'm wondering if the Orion is working correctly, but perhaps we often have more battery power than the BMV is showing?

Please note that the "starter battery" on the BMV is not the starter. It's simply connected to my battery bank.

Here are screenshots of everything on my app today as I drove. I had been unplugged for only 10 minutes or so.

I also include a drawing of my system. The positive and negative feeds from the mppt and the Orion originally went to the positive and negative bus bars respectively, but when trying to get the Orion to do something other than float, I took advice to move them to their current positions on the house batteries.

Thanks for any help or guidance you can give me, I'm completely lost now and way out of my sphere of knowledge!









missy asked
missy commented ·

1 Answer

Absorption end amps for Victron 110Ah AGM deep Cycle Batteries

Hi I Have 5 x 110Ah Victron AGMs in parallel for 550Ah bank , Can anyone advise the end amps in absorption for these ? have heard everything from 1-4 % from watching them a little when on generator through Phoenix charger and inverter it switches to float around 10-11 amps so about 2% does this seem right , alot of people say AGM's should be set higher than this at 3-4 %

Simon Phillips asked

0 Answers

75/10 Bluetooth MPPT showing voltages but not charging

I have the 75/10 MPPT hooked up to a 12V VRLA gel battery and a Renogy 100W PV panel. Basically the same setup as I have in my van, which works great.

For some reason, this setup doesn't want to charge the battery. It's showing what looks like correct PV and battery voltage, but no current or PV production.

Occasionally, the LED on the charge controller will show a solid blue light and the PV voltage will fluctuate, but there is still no current. The battery status will show "bulk" on the app. I confirmed there no current with a multimeter. See below:


But most often, the battery says "off" on the app, and the PV voltage matches the battery voltage. I've tried disconnecting and reconnecting, disconnecting and leaving off for hours before reconnecting, and nothing seems to make it want to charge... see below:


Any advice?

manjusri52 asked
ejrossouw commented ·

2 Answers

Remote switches connected in series?

Hi, can someone tell me if I'm able to connect the remote switches on a solar charger and dc/dc charger in series? I'm running a 123 smart bms which has a programmable relay and I'd like to use this as as high voltage disconnect should one of the cells on my lifepo4 battery come into trouble.

Thanks in advance


Frosty asked

0 Answers

Can diffrent "can-products" clash?

We have an client with an existing Victron 5kVa Quattro inverter. The client wants to replace the old batteries with lithium batteries. We intend on using BlueNova. BlueNova uses the can-port for communication. The only "possible" problem I can predict will be the existing charge controller; which is one of the older ve-can charge controllers victron has.

We will add a GX device for proper control and monitoring, but i want to be sure that the two ve-can products will not clash when communicating with the GX

Will this be a problem or can i assume that it will work? Or is it just safe to suggest a new charge controller?

schalk@solarengineering asked
ejrossouw commented ·

1 Answer

How to set up two multipluses for twice the charging but only inverting from one

My marine system has enough ac output from one multiplus but i want more charge capacity so i would like to add a second multiplus as a charger only and have the charge bee coordinated between the two systems. Setting them both to the same charge curve is insufficient. There needs to be a master. What setting would i use in the ve bus configuration tool? It’s not a Parallel ac system but should i just set it to parallel, pick a master and a slave, and use the front panel button of the multiplus to set the slave to charge only mode? The general,reason i want to do this is since i don’t need the capacity of a second inverter i would rather not have the parasitic load of the inverter idling and the ac and dc wiring of a parallel ac system is much more precise and restrictive on the multiplus location.

Stanton Reed Koch asked
Matthias Lange - DE answered ·

1 Answer

Voltage Spikes, System Failure, MultiPlus Absorption Transition During Charging LiFePO4

System Design:

I have 3 Lion Energy UT1300 LiFePO4 105Ah batteries. They each have an internal BMS and are the 'drop in' replacements for deep cycle Lead Acid batteries. They are rated for maximum 100A charge / 150A discharge each and are connected in parallel using 4/0 AWG cables. On the negative terminal I have 12" 4 AWG cable to a BMV 500A shunt and then 24" 4 AWG cable to a Lynx Shunt. On the positive side I have 24" 4 AWG between the battery bank and a BlueSea m6000 disconnect switch, then 12" 4 AWG from the switch to the Lynx Shunt. The Lynx Shunt is connected to a Lynx Distributor. Then I have a MultiPlus 12/3000/120 connected to the Lynx Distributor via (2) 36" 4 AWG cables and a 400A Mega Fuse. The Lynx Shunt has a 800A CNN fuse. The MultiPlus has the voltage sense connected using a fused 20 AWG wire to the battery terminals. I know the 4 AWG wiring is not ideal, I will replace with larger wire in my final installation, I don't know if it is the source of my issue. Here is a crude wiring diagram



I can discharge the batteries fine, the problem occurs during charging. When the MultiPlus transitions from Bulk to Absorption problems occur. They range from interrupted charging (Absorption voltage set to 13.9 - 14.1) to complete shutdown of the MultiPlus (Absorption voltage set to 14.4 - 14.6).

Here is a picture of the PV during charging showing the transition between bulk and absorption. The absorption voltage is set to 13.9, the unit seems to stop charging after the transition to absorption.


Here is the picture of PV when the MultiPlus absorption voltage is set to 14.4 Volts. The drops during the absorption mode represent when the MultiPlus shuts down and then resets itself. During the shutdown all lights are off and AC1 is off. NOTE: The voltage spikes seem to follow the current peaks. The MultiPlus will continue this interrupt cycle indefinitely until I intervene.



1. Has anyone else seen this behavior?

2. Could this be caused by the BMS shutting down during charging?

3. Could this be caused by using 4 AWG cable?

4. Could the MultiPlus design be causing the voltage spike?

5. What would a normal PV chart look like during absorption mode? I have read absorption mode is a constant voltage with reducing current until charging is complete.

Thanks in advance for any help.

mtnscott asked
Daniël Boekel (Victron Energy Staff) commented ·

4 Answers


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