Installing the Victron Multiplus II Inverter to Power our 50A RV Off-Grid | RV With Tito DIY

(Off-Grid RV Upgrade) HOW I installed the Victron Multiplus II 2x 120V Inverter in our 50A Class A motorhome and WHY this is best inverter for off-grid boondocking. Part 2 of our Winnebago Class A 50A OFF-GRID electrical / solar system RV upgrade.

*Download The Off-Grid Electrical System Diagram for 50A RV*

*UPDATE VIDEO* : Watch the ENTIRE Off-Grid RV Solar Installation From Start-To-Finish

*Video Topics*
00:00 Off-Grid Inverter Installation on 50A RV
01:25 Victron Multiplus II Inverter Features (Model 12/3000 120-50 2x120V)
03:24 50A RV Off-Grid Inverter Configurations
08:00 Victron Multiplus II Cable Connections
10:38 Adding the Multiplus II to an existing RV electrical system
16:00 Wiring the Multiplus II into our AC electrical panel

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*Disclaimer*
The opinions expressed in our videos are our own or from a contributor. Before taking on any project or making a large purchase, we recommend you do your own research and consult a professional for advice. We are NOT liable for any damage to your RV or injury incurred as a result of following our tips, advice or instructions. We are not RV professionals or certified technicians. We are simply RV owners who work on our own RVs and have a desire to share what we learn with others. Be responsible and know your limits.

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[jeanniecalo]

*A quiet **Generater.Systems**, love the dual fuel capabilities, camper is 50 amp but the adapter helps and found it still handles the load. Haven't taken a camping trip yet, that's in a couple of weeks. Will see how well it does over a long weekend.*

[campnut]

You explained the inverter better than anyone I've listened to yet. Great video Brian.

[ShaneKing-je]

You explained this very well. I have done all my own off grid solar/electrical system for my house but was trying to understand the RV system and you cleared it up beautifully. Now I understand and know this is the system I need, I wasn't sure until watching your video. Great Job.

[russellmitchell]

Oh man! This is the best description of my Multiplus pass-through.
Yes, you explained it well.

Cheers

[hermes]

Having installed a Victron Multiplus 2 3000W in previous rv I can say your explanation was well done and complete, nice job.

[petekane]

Take a picture first. Very helpful tip for the DIY crew.

[yairhaim]

Probably the best video description of the Victron Multiplus II - absolutely great!!

[jerryhoxsey]

Finally a straight forward explanation of how to set up whole house inverter. Now I am ready to do this. Thanks

[CartersTrail]

I initially used the Victron 3000W and AM Solar "Smart Phase Selector" for my 50A RV and I've had nothing but problems over the past year. I would constantly lose one side of the panel and at times, both sides. The two were not happy together. I was so happy to see Victron release this new model that I immediately purchased it and removed the extra component. You made a great choice.

[markk]

My two RV hero’s are Bryan and James at the FitRV. Amazing knowledge and fantastic educators. RV manufacturers need to hire you guys as consultants not just influencers.

[jamesmason]

Hello from the high desert of New Mexico USA 🇺🇸. Great job Brian on the installation. That's the inverter that I want to get for my 1967 GM TDH-4519 city transit bus but I just don't have the money for it and my old AGM batteries took a dump on me so I really need to get batteries first because I live in my bus full-time and don't have any power when the sun goes down. Keep up the good work and stay safe and God bless you and your family and America 🇺🇸

[AllAboutRVs]

Great explanation and what a great setup. Looking forward to seeing the final system.

[earlhunt]

Brian, I've used several of your innovative construction mods: flexible panels with t rails, aluminum angle cages for batteries and others. In 2020, I went with an entire Victron system for my class C Navion: 640w on roof, 400w Aux on ground, 4 MPPTs for max efficiency of shading, DC to DC converter, and lots of new increased gauge wiring to meet safety. Then installed the 12vdc dual compressor NOVAKOOL refrigerator. We're 30 amper So went with the multiplus 3000. I've not had a moment's problem and Think Victron is the gold standard for RVs and sailboats.

[offgridcitycouple]

Such a well made and easy to understand video, thanks Brian for the awesome content!
I've been looking through a bunch of resources to try to understand how this device works but no one seems to be able to explain it in non-electrical-engineer terms. Thanks again :)

[pauloconnell]

Excellent job. Worked electronics most of my 80+ years and you did a great job of simplifying things.

[logun]

Just started this journey for my 5th wheel (ie meaning just started researching on how to do all of this DIY) your explanations have been great. Really appreciate this content. Thank you for sharing.

[CozyLivingMachine]

That's probably the best explanation I've seen out there! Victron should hire you to do some of their videos (their site is terrible!)

I would love to see a system like this that also acts as a charge controller, I think that might help justify a bit of that cost -- They're pricey little pieces!

[lemorco]

Your drawing was great. Simple to understand and a great basic knowledge of how these things work. Thanks!!

[markmelvin]

Great to see your video. I'm heading this way based on a couple of videos from @AllAboutRVs. This is a great solution for our class A to power the entire coach with the single inverter. I'm pairing it with two Vatrer 460 AH LiFePO4 batteries. Thanks again for all the great information!

[KUL]

I opted to do this in phases. The inverter Pre-wire on our Brinkley is a 30-amp circuit looped to the front bay of our 5W. So essentially this is like being at the state park on 30-amps. I think it will work for now.

This 30-amp circuit evolved at the factory over time, ours runs everything but the front AC, the 1, 100-watt microwave, the electric fireplace, & the converter.

I unplugged the converter now., of course.

We camp host at 8, 500' in a steep canyon so even though the rear AC (7 amp AC draw) is on that same 30-amp circuit we won't need it 99% of our summers.

Phase B will be to drag two more 6-3 marine grade wire bundles from the kitchen AC breaker panel area through the chase way to the front 5W compartment. That will require the help of a buddy I am told if I am to do it without dropping the belly pan. I like your idea of two different colors of split cover wire protectors. All I will have to do then is upgrade my 30-amp dual 2 gang disconnects over to the 50-amp size.

For phase one I have the 6-3 6 ga. wire in place from the intermediate disconnect box to the inverter already. Since it is emulating being on 30-amp single L1 like a state park (only 12-2 comes with the Inverter Pre-wire), shall I jumper L1 & L2 at the input side of that intermediate disconnect box going to the inverter or leave the L2 line floating? In the case of the 30-amp at the state park with my 50-amp to 30-amp dongle they would be tied together. However I would just be emulating this manually in my own wiring at my Inverter disconnect. I see a lot of folks just not hooking L2 up if they have a single 120-volt line in, but that isn't how the outside dongle on my RV works, for example.

The 6-3 going back out to the coach from the Inverter is wired, but only L1 going back to the Pre-wire line. For now, L2 is going to an outlet I set up for a small Lifepo4 charger that I use as an alternative to recharging a separate 100ah Lifepo4 battery dedicated to powering our Starlink 12 to 48 volt DC to DC converter to our POE. That battery has its own solar panel, but with camp hosting I like to be like NASA & have redundant functions in most everything I do.

Also, since they are shorter runs to my Lynx Distributor, I run two runs of 4/0 cable for both the red & black wires on my MK2, fused at 200-amps each red wire. They run much cooler now at a full 30-amp AC off-grid load which is an easy 200-amps DC. However I did not do this on the 560ah battery bank yet. Even us OCD guys never finish our work!

Cheers, Davey - KU9L