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DC-DC Non-Isolated Charger - Charging Disabled

Morning, Hoping some one can shed some light on my potential issue. I have been revamping my camper van and have installed a DC-DC 12v 30amp non-isolated charger to replace a VSR I had previously. I have also installed a Victron IP22 charger. The IP22 all works as expected and I can see it charging the battery. As a test I connected a Victron IP65 Charger (12v 10amps) I have in powersupply mode to the DC-DC 12v Charger as test before I fit it to the vehicle (I set the powersupply to output over 14volts). Now if the battery is not connected the DC to DC charger says its in bulk charging mode. As soon as I connect the battery it disables the charge. I have double checked all the battery and charge settings and they are correct.

This is my setup for some context :).


drewbie asked
drewbie edited ·

3 Answers

DC-DC Converter: what happens when output voltage is lower than target battery?


I would like to use the Orion-Tr DC-DC converter to charge my house battery from the starter battery. The house battery is also charged by solar.

According to the description of the Orion-Tr DC-DC Conveter it is possible to use it as a constant voltage charger for a secondary battery (e.g. house battery). I wonder what happens when the target battery has a higher voltage than the defined output of the converter? Will it just stop charging? Or will it be destroyed?


[starter batt] -> [DCDC converter, output 13.6V] -> [house batt at 14.4]

patrickschweizer asked
Mike Dorsett answered ·

1 Answer

Dc to dc charger draining starter battery ??

Hi all..

Hope someone may be able to shed some light on this one.

So I am using an Victron 12-12-18a isolated DC to DC charger.

This is how I have wired it :

- Positive from starter battery to input positive on Victron
- Negative from earth point under seat to negative input on Victron
- Positive output of Victron to positive of leisure battery
- Negative output of Victron to negative of leisure battery

Then from the leisure battery :

- Positive to the positive of a 12 way 12v distribution board
- Negative from rear earth stud (drivers side rear quarter) to negative of 12 way 12v distribution board

The issue :

- When on a camp site for 2 or 3 days on mains hook up (there is a battery charger under the seat, charging the leisure battery), the starter battery is losing voltage to the point where I can't start the van ??

Is this being caused by the DC to DC wiring / vsr or maybe something else.

Your help would be much appreciated - I am completely lost !



andyjturner asked
alanr answered ·

8 Answers

Buck Boost and MP2 with connected starter battery (Terminal E)

Hi there,

I've been searching around the community and asked my dealer regarding the following connection but couldn't get my head around this particular situation.

I am instaling a MP2 and a buck boost in a vehicle 24V installation. I would like to use the "starter battery charge" ruction of the MP2 (E-connection) for when the vehicle is connected to "shore power". Also, I would liker to use the auto detection of the buck boost for charging the LiFePo cells.

My question is now: How can I make sure that the buck boost will not switch on when the MP is charging the starter batteries? The he voltage threshold is probably not sufficient and is the vibration detection sufficient? Or is it best to install a fixed input to the alternator via the purple connector of the buck boost?

Thanks for our input and help :-)


lechrisl asked
Mike Dorsett answered ·

1 Answer

Victron Buck boost low input voltage. Will not turn on. Need help.

Hi. This is my first post. I have a Victron Buck boost 50 amp and the buck boost is not turning on. I went into the TSConfig software and the input voltage is at 0.7 volts. I checked my aux battery and the battery has 12.8 volts. I am running a 4 gauge positive and negative wire (8feet long )from my starter battery to the buck boost. Please let me know what you think and what I can do. Thanks.

justin-dillon asked
justin-dillon answered ·

4 Answers

Using both a DC/DC and a MPPT Charger


I am planning on using the Victron Orion TR-Smart 12 12 30 Isolated to charge a LiFeP04 House Battery from the Start Battery of an outboard Alternator.

However, I am also planning on adding solar, to top up the house battery when we are not running the outboard. For this purpose, I am considering the Victron SmartSolar MPPT 100/30, but I am now wondering how the charging would switch between the two systems? Does Victron have a Smart integrated MPPT/DC2DC Charger? Or can it be achieved differently with Victron devices? I know of other branded products that do this.

Can I connect simultaneously both Victron units to the House battery?



adric asked
tdsmith541 commented ·

3 Answers

Buck-Boost Temperature via CAN-Bus


I might to know the answer already, but is there a possibility to get the battery temerature which is on the CAN-Bus into the Buck-Boost for low temperature cut off?

Thanks for your help



dirkmuc asked
kevgermany answered ·

1 Answer

Newby needs help with orion dc-dc charger on lifepo4

Hallo, I have a persistant problem with my setup. Somtimes the voltage of the lifepo4 falls under a treshold to which the BMS shut down the akku output. After that the orion 12/12-18 does not load the akku at all - the charger cannot heave the akku over that treshold again. Other chargers can. I have a small dedicated lifepo4 charger that does the job without problems.

Settings on the orion are all set to lifepo4.

Does anybody have experienced similiar problems, and maybe found a solution?

I 'am grateful for any hints...

dukeofhazard asked
kevgermany answered ·

1 Answer

Orion-Tr DC-DC Converter Isolated - Remote on/off question

I have the non-smart version of the Orion TR 12-30 DC-DC Isolated charger in campervan. My positive input wire is connected to one of the open locations on the battery of a MB sprinter van. I have the input and output grounds going to a common negative buss that is grounded to the vehicle chassis.

I'm little unclear what to do with the jumper plug. From my understanding this model doesn't have the engine detection on mechanism so a wire form the ignition switch will need to be ran to it to tell it when to turn on? I currently have the jumper wire in and Blue Sea Systems battery on/off switch I have to turn off power to the auxiliary battery banks does not kill the power which indicates that my auxiliary system is getting 12v from my vehicle battery via the DC-DC charger because the jumper is in?

nkhofer asked
jeroend answered ·

1 Answer

PIlote Buckboost introuvable


je viens de changer de PC et je n'arrive plus à accéder aux Buckboost 25 ou 50. Lorsque je le branche sur la prise USB, j'entends qu'il détecte quelque chose mais les ports COM disponible ne s'affiche pas.

Lorsque je vais dans le gestionnaire de périphérique je vois bien le périphérique mais il me dit:

- Les pilotes de ce périphérique ne sont pas installés. (Code 28)
- Il n’y a pas de pilotes compatibles pour ce périphérique.

Heureusement mon ancien pc fonctionne encore...

Ma config: Windows 10

Si vous avez une idée et/ou déjà rencontré ce problème, et que vous avez la solution, ...

En vous remerciant d'avance

procamscop asked

0 Answers

Use MPPT for another utility
Hello, I was wondering if it was possible to use an MPPT to convert a 48v battery to 
12v. A simple DC-DC converter is not enough for me because it does not generate enough power for my use (500 / 600W) Thank you :)

mathew asked
JohnC answered ·

1 Answer

Connecting two Orion-Tr Smart converters in parallel

I want to connect two Orion's in parallel to charge twice as quickly when driving. However, I've read that in order to do this you need to connect a 'hot wire' from the ignition to manually turn the units on, as using the voltage sensing can cause issues if there's a slight lag between the two units, causing one to not turn on.

I understand how to connect the two units in parallel, but how do I connect to the ignition to act as a switch? I have a Mercedes Sprinter, not even sure where to start - thanks in advance! I presume there's no other way to charge quicker than 30A? I have a Euro 6 engine so can't use a standard VSR.

nancybeaumont asked
nancybeaumont commented ·

1 Answer

How to charge a starter battery from leisure battery?

Goal : I want to use my vehicle's indoor lights and ventilation during the night (3A 12V).

Setup : I currently have an independant solar and battery setup (700W solar 160AH of usable LiFePO4 battery)

Proposed solution : I think I could use an Orion-TR 12/12-9 converter taking power from my leisure battery and use the cigarette lighter circuit to charge the starter battery (15A fuse so everything seem alright). (The vehicule manufacturer said it's ok to let the car at "on" for long periods if I charge the battery.)

- Will it work?

- If I start the engine and the alternator is working at the same time as the converter, will it cause problem? (alternator and converter in parallel, seems ok from the manual from the possibility of paralleling multiple converters)

- Have I other solutions?


mathieu-dubuc asked
scraggs edited ·

2 Answers

DC DC Converter Parallel & Single Setup

I am about to wire 2 24-12 70 DC-DC Converters in Parallel to power a Mover for a Caravan. But this 140Amps are basically just needed when I use the mover. For the rest of the time, 70Amps is already more than I need on the 12V section and I would like to save standby usage of 2 units when one is sufficient.

Can I install a switch to operate only one DC-DC converter, meaning just one converter is powered without getting problems with current going from the output of the powered converter to the one that is not powered?

Best Regards

nomad asked

0 Answers

Why Steady 'Green LED' on Vic 12/30 DC/DC Orion If Setting is on "Charge" and Tundra Is 'off'?

'05 Tundra, on Battery Tender, Smart Alternator, motor off, DC/DC setting on 'Charge' but steady green LED is on....when I open the breaker the green LED goes out and no 'output' then shows on the Vic Connect DC/DC screen....

2 possible meanings according to Victron....In 'Power Mode', it is not or in " 'float stage' [battery charged]".

Sooooo, what is happening?


phillip-buttolph asked

0 Answers

inclinaison convertisseur DC DC


Je n'ai plus de place pour un convertisseur DC DC. Est-il possible de le mettre en vertical mais incliné à 90 degrés (c'est-à-dire que les inscriptions en façade seraient inclinés à 90 degrés, les câbles seraient branchés sur le côté à droite au lieu de en-dessous). Est-ce qu'il y a une inclinaison à ne pas dépasser ?


roucoups asked
Thierry Cortassa (Victron Energy Staff) answered ·

1 Answer

Campervan Schematics


Hi All,

I have finished my first revision of the campervan schematics, I am sure I would have forgotten a few items (such as the Dometic fridge, a shower solution etc), but this is the general installation. I wanted some people to check it over and to see if everything looks legit in terms of wiring etc. I suspect the solar wattage should be enough considering I have the DC-DC charger? Also in terms of AC power, can someone advise on a suitable distribution box that will work seamlessly with the Multiplus and the correct wire sizes for this also please?

Let me know if anything looks wrong. I plan to fit what I can and get it approved by an electrician.

campervandan asked
kevgermany answered ·

5 Answers

Isolated or Non-Isolated For An RV

I need to install a dc-dc charger in my trailer. I tow it behind my truck and use the truck's alternator to charge the trailer's battery en route (via an anderson plug). The dc-dc charger will be grounded to the trailer's LiFePO battery. the truck's battery is grounded to the body and frame. Should i install an isolated or non-isolated dc-dc charger?

Also, can i create a custom charge profile with both versions of the dc-dc charger?


psea asked
psea answered ·

1 Answer

Victron 12/12 30 cycles on and off (input voltage drops)

I have a 12/12-30 dc to dc charger hooked up to my battery in my car. It has worked perfectly for three months but yesterday it started cutting out. It would work for 5 min and then input voltage would drop and it would turn off then input voltage would go back to 14.2v and it would turn on again and repeat doing this over and over again.

i have 6awg wire ran from the battery to the unit and from the unit to my house batteries, fused at the starter battery and the house battery through a lynx distributor. Not sure what the issue could be so any assistance would be helpful

ryantwomey asked
basil katakuzinos answered ·

1 Answer

Orion-Tr isolee 12/24 15A


J'ai remarqué que le câblage de mes 2 convertisseurs orions étaient particuliers.

Ils rechargent un parc de batterie en 48v.

1- Le Négatif du 24v ( sortie ) était branché sur le Negatif 12v ( entrée).. cela peut endommagé les batteries ?

2- que signifie isolated pour mon cas ?

3- pour la recharge du parc en 48v les 2 orions doivent être réglé sur quelle tension exactement? 27.6v ?

Merci de vos conseils

patrice34 asked
patrice34 answered ·

6 Answers

3 Orion-TR-Smart 12/12 30A communicating over Bluetooth

With 3 Orion-TR Smart 12/12V 30A's paralleled, how does communicating over Bluetooth work with selecting each device individually to set them up, do they appear as unique device names? Anything else required for 3 devices on the same 12V bus?

Thank You.

ve-user asked
ve-user edited ·

1 Answer

Need Orion 12/12 30dc charger PKU

My Orion was working great until I changes the PIN, then lost it (I know my fault). Research showed the PKU is on the underside of the hardware device, let me tell you it is packed away with 4 screws in a difficult place to remove. Is there any other way, any way at all to find the PKU?

Thank you,


girlinvan asked

0 Answers

Orion TR (not smart) battery charging

The Orion DC to DC has "Adjustable output voltage: can also be used as a battery charger".

I am going to assume that the Orion tr does not have a charge algorithm (bulk, absorption, float) like the Orion smart models since it only has one voltage that is adjusted. So, do you just set a bulk voltage? Would it reduce its amperage output based on what the battery is drawing and stop charging. Or is there (or should there be) another mechanism that prevents overcharging on a longer drive?

Alexandra asked
JohnC answered ·

2 Answers

Orion TR Smart and Euro 6 Engines

Hi the collective hive of information.

I am in the middle of commissioning an Orion TR Smart 12/12-30A on a VW T6 Camper van. The system doesn't seem to be triggering that often, and even after a couple of hours driving the Lithium batteries are not full.

All default settings have been used, but the start battery is regularly at 12.3-12.5v.

Are the default settings too aggressive, do they need to be dropped. If so any recomendations. I have done various searches and running second battery charging with Euro 6 engines seems to be a dark art with little information about what a good set of settings should be.

My instincts as opposed to science or knowledge is to:

Drop Input Voltage Lockout to be 12.1v / 12.3v. After starting the engine and idling the starter battery is regularly at 12.2v, so restarting shouldn't be an issue at 12.1v.

Setting Start Voltage to 13.2v

Setting Delayed start to 12.8v

Setting shutdown voltage to 12.7v

Any guidance, are these values too low?

Many Thanks



bathnm asked
pau1phi11ips commented ·

0 Answers

Parallel operation of two buck-Boost DC-DC Converter 100A

Hello, is it possible to operate two converters in a parallel relay to provide a charging current of 80 amps in total, the system consists of a 100 ampere generator 24 volt system?

anton859 asked

0 Answers

How does this not ruin a Start Battery?

In this design example, a Sterling DC to DC converter is used to charge a lithium house bank with the Start battery as the "Source". So for example, if we are charging the Lithium Bank at 60Amps over 3hrs, how is this justified when a Start battery is not designed to provide high current over a long period of time?


ve-user asked
pau1phi11ips edited ·

3 Answers

orion 12/12 30 how to factory reset?


I may need to reset my Orion smart TR 12/12 30 to the factory default to get the Bluetooth to let me log in. It wants a PUK, which I have on the box, but the unit doesn't take it and results in an ff00 error code as shown on my phone. Tried both upper and lower case letters, and double checked it a few times, It then wants to wait a while to try it again. I can see the device, from Bluetooth and I can connect to my other Victron devices just fine. This unit is new, and it will not let me in to set up the parameters at all. (BMV 712 works, MMPT 150-30 works, Victron inverter works, all on Bluetooth on the same phone).

The unit was just installed.

First time, trying to connect at all. (lots of other boats with Victron stuff near by, so i would not be surprised if someone tried to connect into it by mistake.)

I have the PUK on the box. That does not work.

Is there some other default password?

Does it have a factory reset button someplace to restore the default settings?

Is there some other solution to resolve this or does that error code mean the unit is defective?

Thank you,


waltschn asked
mototravel edited ·

4 Answers

Why does my Orion-Tr Smart make a loud chirring sound?

My Orion Smart-Tr DC-DC makes loud and weird noise when the output starts, both the charge mode and power supply mode. See video.

This can't be normal? What could cause this, or what should I do?

Background: the Orion Smart-Tr 12/24 DC-DC in a camper van, charging the leisure battery (24V) from car battery (12V). Leisure battery also has other charging options (solar + Victron Skylla-IP44), and everything works well.

Edit: When it's on, I get 10-15 A current going out as seen and confirmed by the leisure battery BMS. So the unit seems to work, but I don't dare to use it in its current state.

jtm asked
jtm edited ·

2 Answers

Orion-Tr Smart DC-DC Charger Isolated (Size of Wire)

Anyone know the biggest Wire that the size Orion-Tr Smart DC-DC Charger Isolated could take?

i Have gauge 2Awg... Will that fix?


fenix asked
mjaben commented ·

2 Answers


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