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battery charging

cycle use control voltage same as bulk absorption voltage?

i have universal agm ub1211100 batteries with specs here

they say a "cycle use control voltage of 14.6. to 14.8v and float use control voltage of 13.6-13.8v"

I have set the 100/30 MPPT controller to charge profile 3 which will charge to bulk at 14.7v and float to 13.8v

do you think I have understand correctly the defintion of cycle use control voltage to equal the bulk voltage?

gavinge asked
Kingfisher answered ·

1 Answer

Can I have solar connected with a dual battery?

Hi all, I have a dual battery system set up in my car via a battery isolator.
i want to mount a solar panel on the roof rack and run it to my Victron 75/15 solar controller and onto my second AGM battery.

My question is can I have this wired in all the time even when driving the car, will it conflict with the dual battery isolator or will it sense the isolator and not send any charge to my battery?

Just don’t want to fry my battery.

Rumy asked commented ·

0 Answers

With a second battery installed using only an Orion-Tr Smart Charger, can I use "hot" auxiliary outlets with the ignition key off?

I want to install an Orion-Tr Smart DC DC charger and a second battery as you show in your charger manual. Once installed, I want to use the "hot" accessories in my vehicle with the ignition key turned off. Will the smart charger use the second battery in this scenario? asked

0 Answers

Which Shunt do I need (dummies guide)

hello all,

Spent a lot of time trying to find the answer to what might be a simple question. A buying guide would help iron this out.

I have two engines, one engine goes to an isolator which charges the following

two x XV31MF (aft) for the bow thruster (Total 220ah)
three x XV31MF (stern) for entertainment and engine start.(Total 330ah)

Reading the posts a 500am might be ok? My concern is the engines which are large volvo Penta start from battery bank 2. The batteries are say 1000 cold crank amps that’s 3000 CCA the shunts go up to 2000 amps.

So I am confused what amps I look at for the shunt

CCA is a lot higher than the amps

the above two groups are in parallel

Brand Numax
Range Numax XV
Voltage 12 Volts
Technology Wet
Capacity (C20) 105 Ah
MCA 925 A
CCA (EN) 740 A

Rsmith9848 asked

0 Answers

Multiplus not bulk charging

Hi. I have a new install MP2 3kVA with victron gel batteries (4 x 220AH in series).

I did an initial discharge test down to what the system believed was 70% or 48.9V.

When I cut back power, the charger went straight into float, not bulk.

It has slowly charged back to 85% and is now in storage mode.

Any ideas why it would not have bulk charged?

Should I just run another (longer) discharge cycle and see if it corrects itself?

nickdb asked
Barney9304 commented ·

1 Answer

EasySolar stuck in Storage mode

I own an EasySolar system comprising of a Multiplus Compact 24V/1600W/40A and BlueSolar charger MPPT 100/50 (Rev 2) fed by 4 x 250W solar panels, with 4 x 12v/170Ah Victron AGM Super cycle lead acid batteries as storage.

If I run the system in the “Batterylife” ESS option, the batteries discharge to the SOC level(s) – 80% - at which point the solar charger appears to become disabled and all appliances are left running on a grid feed.


Changing the mode to “Keep batteries charged” re-enables the solar charger, thus allowing solar to run any system load, and slowly recharges the batteries back to full capacity over a week or so. At night, any system load is met via the grid feed however, rather than from the batteries.

If I reset the system from the Color Control panel (MultiPlus Compact >Advanced >Reset), this succeeds in shifting the system from Storage to Absorption/Float and rapidly recharges the batteries, as well as allowing them to power any system load overnight.


However, after around 48 hours the battery voltage drops and the system then reverts back to Storage mode.


The batteries discharge to the SOC level, which disables the MPPT and requires me to intervene again as above.

The company that installed my system initially attempted some remote fixes, but did not resolve the problem. They now no longer respond to any contact from me.

I understand from this forum that this is not an uncommon problem, although solutions appears to be scarce. It seems that the Storage mode can be disabled via the VEConfigure set-up system, but I am not trained to do this myself, nor am I certain if this would fix this problem.

Just wondering how to get the system working properly, any advice appreciated.

KeithS asked
KeithS commented ·

2 Answers

using an MPPT as battery charger using main car battery as input


In my camper I have 3 changing/power options in parallel for my auxiliary batteries:

1)Quattro 12V based system

2)MPPT 75/15 solar charger

3)24V to 12 V converter connected to the main car batteries while driving.

The 24V to 12V converter does not charge the auxiliary batteries well; it does not regulate the output voltage properly. I am able to operate refrigerator, lights etc. by using this system in case the auxiliary battery is empty.

To be able to charge the auxiliary battery while driving I came up with the idea to connect the 24V main battery to the solar input of the MPPT75/15 and disconnecting (and float) the solar panel (relay). In this case the car generator would act like a ‘solar panel’, generating about 24-28V ‘sun’ voltage.

The MPPT does manage the output voltage well for charging of the batteries and I should be able to charge the auxiliary batteries properly.

Would this be a good option? And a smart choice to do? Or can I expect issues?

Thanks for your help, B

Bertus asked
Loxley commented ·

1 Answer

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

Need Help to Install Victron Orion-Tr Smart 12/12-30A with Schaudt EBL 119

Next Week i will install the Victron Orion-Tr Smart 12/12-30A and a LIONTRON LiFePO4 12,8V 150Ah Battery. I have a Globecar Campscout B. In this Car is the EBL Schaudt 119 installed under the Seat from the Driver. At this Position there is also the Battery for the Engine. Under the Passenger Seat is the Place for the new LiFePO4 Battery (now at this Time there are two AGM Batterys).

The Victron Orion-Tr Smart 12/12-30A has an Option to detect that the Motor is running, so i do not need to search the D+ Line. But which Cables must i install from the Schaudt EBL 119 to the
Victron Orion-Tr Smart 12/12-30A and then from the Orion back to the Schaudt ?

I can not find a Guide for that Combination. In the Userguide are Configurations explained but i am afraid that i make a Mistake.

Please can you help me which Cables i and Configuration i must use ?


ChrisS asked

0 Answers

Blue Smart IP22 Charger 3 outputs - will run 3 independent charge cycles? if not, should I use separate Isolator?

The title says it all. I am not very proficient with boat electrics, therefore some of the answers are too technical for me.

I have the Blue Smart IP22/30 Charger 3 outputs and 2 battery banks.

Shall I connect them as:

1 output --> Isolator --> battery banks


2 outputs --> Battery banks?

In the second case (which sounds more reasonable), will the charger sense the individual banks' Voltage and charge?

Or will I have to wait for service bank to reach the starter bank charge level and then fill up?

thank you in advance.

Sailorman asked

0 Answers

why i can';t charge the batteries to 100%?

Hi, i have just purchase the batteries (LiFePO4) and i am charging them with the smart charger from victron. But it seems they don't reach the float level. they have been connected for over 5 hours. is it normal?



camillamassacesi asked
Stefanie answered ·

1 Answer

24v 16amp Battery Charger Flex Cable

Hello, I recently purchased a 24v , 16 amp Phoenix Battery Charger but it has no household plug on it; do I use 1mm2 , 3 core to wire to a standard plug?

The output wires I am fine with. Thank you for your help

Kernowsolar asked
Kernowsolar commented ·

1 Answer

Nach Update auf V1.50; Warum lädt der MPPT 75/15 Laderegler nur noch in Erhaltungsspannung (Bulk) ?

Hallo, wir haben einen Smart Solar MPPT 75/15 an einem 110 Watt Solar Panel und einer 225 Amp/h Batterie installiert.

Vor dem Software Update auf V.1.50 hat das System toll funktioniert.

Bulk und Float alles ok. Siehe bitte Foto.

Nach dem Update auf V1.50 kennt das System nur noch Bulk - Ladung.

In den Tagen vor und nach dem Software Update waren keine Stromverbraucher aktiv. Auch sonst wurde nichts am System verändert.

Wir haben nun seit 3 Tagen Verbraucher hinzugeschaltet. Das System lädt weiterhin nur in Erhaltungsladung - Bulk weiter. Die Sonneneinstrahlung ist in den Tagen vergleichbar.

Warum lädt der MPPT 75/15 nur noch in Erhaltungsspannung (Bulk) ?

Gibt es ein neues Softwareupdate? Oder kann man auf die alte Software Version zurück wechseln?

Vielen Dank schon einmal im voraus für die Informationen.


Wesso asked
Stefanie commented ·

2 Answers

BSC IP67 Volt und A Anzeige fehlerhaft?

Hallo Zusammen,

habe hier ein BSC IP67 Ladegerät an einer Victron 90Ah LiPo hängen. Ladestand der Batterie ca. 50% (BMV-712) bei 13.11 Volt (Multimeter). Wie dem Screenshot zu entnehmen ist das BSC IP67 da anderer Meinung.


Habe jetzt auch mal alles von der Batterie abgeklemmt und nur das Ladegerät angeschlossen. Gleiche Situation.

Hat wer eine Idee?

CaEike81 asked

0 Answers

Travel Trailer Generator Backup Question

Hello, I just wanted to ask if this setup sounds correct for a backup with a generator. I have a travel trailer with a 1600W air conditioner (3900W Startup). I want to have a 2800W generator to back up in case of loss of shore power. I am looking at the Multiplus 3000W 12V to 120V, and a 60A MPPT to handle the 800W of solar into 2400W of lifepo4 battery. The generator has an autostart feature that works when it senses a closed loop. So, my idea was to have the inverter installed normally with AC coming in from a Automatic Transfer Switch. I would have a rely that would close when shore power is lost thereby closing the loop and starting the generator. The ATS would switch to generator power and send it to the multiplus. Does this sound workable?

My questions are about the battery charging. Since I will be charging from solar and the multiplus, is there a way for the units to communicate so as to not send too much current from both units together? Any other devices I should have besides the multiplus, solar controller, and ATS?


CappyJax asked
CappyJax commented ·

2 Answers

How to upgrade my Ah if there is no 90Ah LifePo available anymore?

Hey Guys,

I am just wondering if somebody has an Idea, how to upgrade my System to have more Ah available.

Currently I am using 1x 90Ah LifePo. As there is no 90Ah from Victron available anymore and as it is not possible to mix it with an 100Ah, I am wondering what to do?

Any Idea? Or is the only way to buy 2x new 100Ah‘s

Thanks in Advance,


CaEike81 asked
Matthias Lange answered ·

1 Answer

Progressive Dynamics Converter with LFP batteries

Can anyone comment on the suitability of a Progressive Dynamics PD9140-24L converter for use in charging a pair of LFP 25.6/200 batteries being monitored by a ve.bus bms? I am interested in having this to assist my Quattro when there is grid or generator connected power to charge the batteries as fast as possible.

It seems these are set for a 29.2v charge voltage which is slightly beyond the 28.8v limit stated in the battery manual. This would work out to 3.65v per cell which is below the thresholds enforced by the BMS (3.9v I believe). I think I could greatly reduce risk by putting a BP-65 on the positive line from the converter. I can have the BP triggered by the BMS Charge Disconnect remote wire.

Does this seem like a feasible setup?


cookinwitdiesel asked

0 Answers

MPPT 100/15 battery reading issue

I have an MPPT 100/30 connected to a single 50W solar panel and to a 240 AH 12V battery array. The multi-meter reads 12.1V at the battery terminals, 13.5v at the terminals on the MPPT and the software reads 13.5V. Consequently, the batteries are always in float and no charge is being given to the batteries. Fuses are both OK and I have the mppt connected to the battery isolator.

Nachofon asked
Nachofon answered ·

2 Answers

Victron SuperPack 12,8v 100Ah and a 140A alternator

Hi everyone,

Just bought a Victron SuperPack 12,8v 100Ah battery, this battery has the BMS integrated this is the reason why I chose it.

This battery will be installed in my camper van as a leisure battery, but a big question question come to mind, will my 140A alternator sustain the charging load.

From the battery's technical datasheet, it only pulls up to 50Amps when charging, but is this really the case ?

Since this battery has a BMS of its own, does it control the current pulled when charging ?

Can this limited charging current be set in the battery's BMS via the mobile app?

Will I need a DC to DC charger in-between the alternator and the battery ?

By the way, the alternator is a Valeo 439753 which is regulated and I currently have an 80Ah battery as my main battery and also a split charger relay.

Thank you in advance for you response


Philouteke asked
Philouteke commented ·

2 Answers

How does Cyrix-Li-ct work?

I just replaced my original battery combiner with the Victron Cyrix-Li-ct. I tied the small read lead to both my dashboard wire (AUX START) and to AM Solar's AMS Lithium Control Module v4.2 to the ALT + and - connectors.

Can someone explain to me how this relay is supposed to work? I have 3 typical scenerios: (1) vehicle running (class A motorcoach) with no solar, (2) shore power and (3) dry camping with plenty of solar.

Is this a "one-way" solenoid? Are both lithium batteris and chassis batteries affected in the above scenerios?

I've included the data sheet from Victron for your refereance.


Edgargw22 asked
abogaard commented ·

3 Answers

Flotacion AGM


Tengo un sistema con un multiplus 48/5000, 1 MPPT 250/85, 1 MPPT 250/60, 1 BMV-712 y 4 baterias AGM 260Ah en C100 (200Ah en C10). Está todo el sistema de manera "automatica" con los valores recomendados. Las baterías tardan mucho en llegar a flotación, mas de 5h desde que llegan al 100% de carga. No se si es correcto o el sistema está mal configurado. La intensidad de carga despues de llevar un rato al 100% ( y 57,6V) es de apenas 1A, pero no pasa a flotación.

¿Alguna idea del problema? Gracias.



I have a system with a 48/5000 multiplus, 1 MPPT 250/85, 1 MPPT 250/60, 1 BMV-712 and 4 AGM 260Ah batteries in C100 (200Ah in C10). The whole system is "automatic" with the recommended values. The batteries take a long time to float, more than 5 hours since they reached 100% charge. I don't know if it is correct or the system is incorrectly configured. The charging intensity after 100% time (and 57.6V) is just 1A, but it does not float. Any idea of the problem? Thank you

Girbar asked

0 Answers

Why is a 50 Amp Buck Boost charging at 10 Amps

I have a 50 amp buck boost connected to a 12 V Euro 5 alternator on input and 200 Ah of 12 V lithium Battery on output. Buck boost charges battery at about 10 amp regardles of engine revs. Battery will accept 60 Amps from shore powered mulit-compact. Any ideas what problem could be?

Scott Simpson asked
Matthias Lange answered ·

1 Answer

Charger moving to Float and not moving back

I will preface by apologizing for not being an electrical expert...but I'm running into a few issues. I have a Victron BMV 712, a Victron MPPT charge controller 100/30, 300 watts of solar and 200ah Battleborn batteries (all fairly new). My batteries were charging up to around 85% in Bulk then spending some time in Absorbtion and finishing in Float to 100%. Now they are switching to Float at around 80% and will not switch back to Absorbtion or Bulk for the remainder of that day. I have tested this by waiting until it goes to Float and turning on my appliances and running it down to 50% (all the while the MPPT stays in Float). The next day it cranks right back up in Bulk and goes up until about 80%. I am using the app and (think I have) configured my charge controller and BMV according to Victron instructions. What could be happening here and/or what information would need to hazard some guesses? Thanks!

thompsondr1 asked
Daniël Boekel (Victron Energy Staff) commented ·

4 Answers

turn off battery charger

I have a multiplus 12/3000/50 and I would like to have the inverter on so ac would be passed through but have the battery charger off. Is there anyway to run the device with the battery charger off?

jabrockert asked
serpa4 commented ·

2 Answers

Where do I put the master switch for a battery to battery charger two battery system on a boat?

Hi everyone,

A simple question for those that know I suspect.

I'm trying to wire up a basic boat system, with a lithium house and a lead acid engine start battery. I have a Victron Orion TR Smart battery to battery charger and just want to know where the main battery isolator fits into this system. I realise both batteries must always be connected when the engine is running so that the charge has somewhere to go when the lithium battery reaches full charge. Can I continue using the traditionals 1/2/both swithch shown as per the schematic at the link below or do I need to have completely separate isolators. Can someone explain or even better draw on the schematic to complete the wiring diagram?

Many thanks for any assistance


AndrewL asked

0 Answers

Which Victron products will work on my system?

I have a 500 watt solar panel with 25.78 V and 19.39 A.

1. Would I need a 100/50, 100/40 mppt or a 150/50 mppt?

I will have 2 x 12volt @ 200 AH each lithium batteries and then upgrade to a 3rd battery for a total of 7680WH.

2. Inverter Charger: I am thinking a 12/3000 as I have high items that draw high watts. Up to 1800, eg, hot water heater and induction cooktop.

Does the Multiplus include the charge controller and inverter charger in one? If so, can they be used in a van setup like mine?

3. I would also like to add a b2b charger but not sure which one of your products will be best for my situation. Any links to diagrams would be very helpful. Than you in advance. Deon

deonbez asked
Matthias Lange answered ·

1 Answer

About my victron system using battery protect


Hello I have updated my electrical design for my wiring, I made sure that the current would flow into the BP in and leave from the out. Can you please let me know if this is safe thanks

Chinaka asked
Chinaka commented ·

1 Answer

Protecting LiFePO4 batteries from all sorts of things If I connect my MPPT, DC2DC charger and a EHU charger to one side of a Battery Protect and the other side to the battery, and connect my BMV712 relay output to the Battery Protect, would that then disconnect my battery bank to prevent being charged when the temperature drops cold (as well as if it gets too hot) and disconnect in the event of low (or high) voltage events? Or is it not so simple as that?

brassmonkey001 asked
brassmonkey001 edited ·

2 Answers

Help with system to charge 12v AGM battery

I have an Optima D34/78 Yellow Top 12v AGM deep cycle battery (55 AH) that I would like to charge with a 100 watt solar panel. Looking at the GoalZero Boulder 100 panel - The GoalZero rep said this panel will charge my battery and he recommended Victron for a charge controller. So a few questions:

1. Do you agree that this is enough wattage to reliably charge my battery year round, even when there are not a lot of bright sunny days?

2. What charge controller should I use for best results?

Some other information:

Location Pennsylvania, USA, latitude = 40

No trees or other obstacles to the south of panel location. Some trees to the north, east, and west

Distance between solar panel and charge controller / battery ~ 30 feet

rastaman147 asked
rastaman147 commented ·

4 Answers


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