Hello everyone, I’m new to the forum and excited to join this community—greetings from Germany! I’ve already found lots of valuable info here, and now I’d like to ask for your advice regarding my system setup. I have a Victron setup in my campervan that I would like to optimize. Currently, I have…

You can use the VE.Direct TX output cable from an MPPT to connect to the remote H terminal of the small Orion directly, but only because you want to use the Orion to charge the starter battery. The Orions remote terminals are referenced to the input voltage. If you want to do the same on the bigger …

Thanks for your reply! At first, I had a thinking error: I can actually connect the input of my Orion DC-DC 9A directly to my positive and negative distribution point and control it via voltage monitoring, just like my other Orion. In my case, it switches on at 13.7V and off at 13.3V (the MPPT is s…

I dont think this would work well when only voltage controlled, i feel like its just going to end up wasting energy since both Orions would try to charge their output battery, which is in turn the input of the other. Id use the remote terminals, on the big one to only enable it when the ignition is…

Great discussion. I wish Victron would release a single dual input device (alternator + solar) to charge: house battery from solar and/or the alternator top up the starter battery when required

Or maybe a dual output mppt unit :wink: One output for the house battery and one for the starter battery (that one could be really small, like 5A or so…) That would be the ideal solution for me! But for now, I bought a second DC-DC Orion (9A) and still have to install it — just means more wiring w…

Voltage control has worked really well for my Orion for the past 5 years, as an alternative to ignition signal. Maybe I didn’t explain the Orions clearly. The existing one is already voltage-controlled off the alternator and charges the LiFePO4 house battery while driving, following the appropriate…

What i meant with “Voltage control wont work” is not that the Engine Running Detection will not switch on, but rather that it will switch on more than you want, and on both Orions at the same time. This is not about isolation or not, it works as good or bad using non-isolated Orions. I hope a little…

Thank you very much for your effort! Okay, I understand the problem, but I still think that it might work reliably due to the chosen voltages. It will take a bit longer: the Orion has arrived (used), but unfortunately, I didn’t notice that it’s a regular Orion without the Smart features… …

Is it working or did you find any other solution? I have the exact same problem and it seems difficult to me to get it done with voltage control.

Dual Victron Orion DC-DC Setup Questions

DIY

chrigu 29 July 2025 21:32 6

If you have a 12 or 24V MultiPlus or Quattro you can use its trickle charge output to charge the starter battery, even if the MP is off and the house battery gets charged from an MPPT for example

Topic		Replies	Views
Where to place the ORION DC-DC? DIY marine , beginner	20	996	9 July 2025
Running MPPT INTO DC-DC charger? DIY beginner , rv	8	1915	11 March 2026
Charge both starter and leisure battery's DIY diy	11	1619	23 October 2025
Orion Smart Isolated DC-DC charger with a solar panel DIY beginner , rv , parallel , orion , victron_community	9	302	23 October 2025
Use Orion XS 1400 for DC to DC Charging (12v to 24v) and Power Supply (24v to 12v) DIY diy , orion_xs , cerbo_gx	4	1029	24 April 2025

Dual Victron Orion DC-DC Setup Questions

Related topics