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Magnum 2800 to Victron 3000 swap - AC Output Thoughts

Watts Happening

I call it like I see it.
Joined
May 3, 2022
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I couldn’t stand using the factory Magnum 2812 inverter in our bus so I swapped it out for a Victron 3000 that I had sitting on the shelf today, keeping everything 12v for now and will probably swap in a couple 48v Quattro 5000’s over the winter (have those on hand too).

The factory setup is a “main” panel, which feeds power to the inverter, then power comes back to an “inverter” aka sub panel.

That said, the original Magnum has (2) 10/2’s coming in and (2) 10/2’s leaving. It passes through both legs of the 50a service. The Victron only does 120v so I effectively ditched one of the input and output wires and tossed a jumper between phases in the inverter output panel so it would light everything up.

All is working as expected, but here I sit on the couch thinking it’s prone to overloading the 10awg wire. Obviously the wire is sized appropriately for the inverters ability to invert power, but it’s NOT sized properly for what the Victron can pass through and combine with inverter power. Effectively 30a from AC and another 25a from the inverter, resulting in the possibility of outputting 55a over a 10awg wire, no bueno.

It’s not realistic to run a larger wire, huge pain, not gonna do it. So my thought is, why not use the “ditched” 10awg output wire and just put both 10awg wires into the Victron AC output? This will then feed each side of the inverter panel and can handle the max theoretical amperage.

Thoughts?
 
What victron unit? Multiplus?

I’d just limit the AC input via software, unless you need 50a.
 
NEC, If you follow it, states 1/0 AWG as smallest wire to be run in parallel. Article 310.10 (G). Not sure if it applies to RV's.
 
What victron unit? Multiplus?

I’d just limit the AC input via software, unless you need 50a.
Yes it’s a multiplus, and I did think about limiting it via software but then I’m sorta self limiting most of my RV. That limit sets both battery charging and pass through, I don’t particularly want any major limits if I can get around it safely for the short term.
 
NEC, If you follow it, states 1/0 AWG as smallest wire to be run in parallel. Article 310.10 (G). Not sure if it applies to RV's.
I’m aware, and I agree, the premise being if you lose one of the two conductors you’re now putting the entirety of the current on a single conductor that isn’t rated for it.

That said, with as rare as I would expect to overload even a single circuit, my logic is that it’s technically NOT paralleling the wires. Yes, they originate from the same output source on the multiplus, but where it differs is that one wire is L1 into the panel, the other is L2. If one wire breaks or otherwise becomes disconnected, it doesn’t dump any extra current on to the other wire, that side of the panel simply quits working.

Additionally the way they are each connected to the panel is via a 30a breaker, thus if current was exceeded on either its corresponding breaker should disconnect.

Agreed?
 

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