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AC wiring dual multiplus'

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TankFish

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Feb 2, 2021
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I need a bit of help with wiring 2x Victron Multiplus 3000 in a 50amp RV. Just the AC side. I have the DC, panels, orion, etc done. I cannot find a correct wiring for the AC side. Right now, I have them wired separately (red to one and black to another [neutrals to a neutral block]). Obviously your configurations are off and you would need two CCGXs to see them (or other monitoring tools).

I have gone through classes on the professional website, searched for diagrams online, about exhausted every option before landing here.... again..

I have found many many diagrams, all with people commenting problems with them. All I want to do, is parallel the two Multiplus' together. I want to do this correctly and safely. From what I've gathered, since the multiplus can only take IN one AC hot, is you run the black to both or red, to booth inputs and then the second output run the opposite and tie them together. That seems unsafe, or is that how it's meant to be done?

Yes I should have went with quattros in retrospect, but it's to late now. Lesson learned. Can any one explain the AC wiring a little more clear for me or draw it out? Doesn't need to beautiful, just comprehensive. Any help would be great. Thanks!
 
Are you trying to configure as 120VAC/240VAC split phase or 120VAC single phase?

And you don't need 2X CCGX to see them. The CCGX can see multiple VE.Bus inverters in the chain if properly connected.

They must be configured to operate in parallel as a master/slave and if they are operating in 120V or 120/240V mode.

Have you made allowances for plugging into 120/240VAC split phase 50A shore power and 120VAC single phase 30A shore power?
 
snoobler said:
Are you trying to configure as 120VAC/240VAC split phase or 120VAC single phase?

And you don't need 2X CCGX to see them. The CCGX can see multiple VE.Bus inverters in the chain if properly connected.

They must be configured to operate in parallel as a master/slave and if they are operating in 120V or 120/240V mode.

Have you made allowances for plugging into 120/240VAC split phase 50A shore power and 120VAC single phase 30A shore power?
Click to expand...
I'm trying to configure it as the trailer came. Two poles of 120. Sorry, I'm literate in house wiring and 180* split. This RV has two 120v (dual 50amp breaker) feeding each side of the box. I'm guessing I would run it as a normal 220 @180*?

I knowni don't need two CCGXs, the way I have it now I would. I want to be able to parallel them so I can use one CCGX.

I understand how to configure them. I went through the training videos and saw how to use the VE configure. I played around with the "Fake" options. I was able to build a template for a 2 multi system. I just can't do the actual configure until I wire them appropriately.

I have not. I will never plug into 30a. We are traveling military and every place we stay has 50amp (which I test before I plug in). I have an ATS in and will probably be buying an SPS when available to purchase. Right now, we are all 50amp. We'll 80% solar and 20% 50amp.

I can wire a house, without hesitation. I just don't want to wire this wrong and burn down my rig or burn up a multi. Just need to figure out how to wire them together properly. Do I just run the red to both inputs, then wire the red out of out1 and the black out of out2? What do you do with the input black?
 
Master AC-out is L1 and N
Slave AC-out is L2 and N

Your 50A in L1 goes to AC-in L on master, L2 goes to AC-in L on slave, N to both.

Victron has lots of schematics.

www.victronenergy.com

System schematics - Victron Energy

A system schematic shows schematically how Victron Energy devices are connected to each other. Find schematics for your product.
www.victronenergy.com www.victronenergy.com

While these are for Quattros, you can adapt them to Multis:



Note that it is critical you NEVER plug in to 30A shore power or any other single phase power. Ever.
 
snoobler said:
Master AC-out is L1 and N
Slave AC-out is L2 and N

Your 50A in L1 goes to AC-in L on master, L2 goes to AC-in L on slave, N to both.

Victron has lots of schematics.

www.victronenergy.com

System schematics - Victron Energy

A system schematic shows schematically how Victron Energy devices are connected to each other. Find schematics for your product.
www.victronenergy.com www.victronenergy.com

While these are for Quattros, you can adapt them to Multis:



Note that it is critical you NEVER plug in to 30A shore power or any other single phase power. Ever.
Click to expand...
That is exactly how I have them wired now. Yet, if I don't use AC out 2, I get an error when in VE configuration.

I have Red in to the master AC IN 1, red out of AC out 1 and into the breaker panel.

I have black in to AC IN1 on the slave, out of AC1 into the breaker panel.

Now they both have a AC out 2. If I don't have anything going out, it won't let me configure them. This is where I'm at. Either I'm configuring something wrong or the wiring is just not right. They have a shared neutral, grounding is good. They run fine if I just leave them not configured, but I want them as a pair so I can use one GX and configure them the same for solar, charging, excess, etc.
 
What error are you getting?

In order to configure them in parallel, they must be in their final configuration, i.e., both connected to the VE.Bus. If they are not chained with an ethernet cable, they can't be configured.

Connection: MK3 to CCGX to Multi-1 to Multi-2 (ethernet cable at each "to"). You can omit the CCGX, and connect MK3 directly to Multi-1.

AC-out-2 should not be used as it's ONLY active when the inverter is receiving AC-in.

Isn't red typically L2 and black typically L1?
 
It won't let me configure them through the CCGX. I mean it will, but when I use the VE bus configure, it disconnects and I have to reconnect it each time I got to VE configure. Its annoying, so I just plug into them from the port on the multi itself. The CCGX displays the one MP its plugged into, it only acts weird when I try and configure the MP.

I keep getting an overload error on MP2 (slave) when I put them in parallel. Maybe it's the red and black? Didn't think it would matter honestly with them being parallel. I'll switch them from master to slave etc, and see if it gives me the same error. Maybe that is the issue. I guess I'm just getting wrapped around this split phase 2x120's. Wasn't expecting it. I first thought it was 240 (220) until I used a MM and checked it when I first opened the breaker panel up.
 
So, you are running VEConfigure3 on a computer attached to a USB-MK3 adapter connected to Multi-1 connected to Multi-2?
 
Yes. Windows laptop with ve tools, MK3 usb, ethernet to one multi, ethernet from one MP to the other. I can get them both to pop up fine, put them into parallel and drag and drop them on their lines. Then I configure each individualy as stated in the training. Save the settings, send the settings, etc. The slave goes straight into overload once configured and on. I'm going to switch them once it cools down outside and I can turn off power for a bit. See if the black has to be master? They both go to different poles that is why I didn't think it mattered but, worth a shot if it's the fix.
 
It sounds like you're doing it backwards. It's my understanding you configure them as Master and slave first and configure each unit. The last step is dropping them on the lines.
 
I have the shore turned off when configuring them if that is what you mean. They have no AC power, just DC.

Same errors. With the red as L1 they just keep clicking on and off. If Black as the master as L1 I get an overload.
 
TankFish said:
I have the shore turned off when configuring them if that is what you mean. They have no AC power, just DC.

Same errors. With the red as L1 they just keep clicking on and off. If Black as the master as L1 I get an overload.
Click to expand...

I'm sorry. I'm at a loss. It does not seem to be behaving as it should.
 
you can't run VE.Configure at the same time as CCGX (this is documented) - unplug the CCGX while using VE.Configure (or VictronConnect).

You have a few options ... you can:

1) Put the units in parallel, feed them from ONE leg of AC, and tie BOTH RV 120 legs to the AC Out; this limits your max input to 50 amps (instead of 100 amps AKA 2 50 amp legs); you'll get 6kVA and you don't have to worry about balancing L1 and L2
2) Put the units in split-phase and treat input and output as split phase (even though you don't have 240 inside the RV). This allows you maximum flexibility with what AC service you can connect to, but limits each leg to 3kVA on the output side while inverting (may be OK for you) and you have to balance L1 and L2
3) Run the units standalone, one on each leg of AC; same 3kVA per leg limit applies

Unit 1 takes L1/Red + neutral and Unit 2 takes L2/Black + same neutral (white). The input and output neutrals should be the same length on both input and output (especially if you do split phase).
 
cinergi said:
you can't run VE.Configure at the same time as CCGX (this is documented) - unplug the CCGX while using VE.Configure (or VictronConnect).

You have a few options ... you can:

1) Put the units in parallel, feed them from ONE leg of AC, and tie BOTH RV 120 legs to the AC Out; this limits your max input to 50 amps (instead of 100 amps AKA 2 50 amp legs); you'll get 6kVA and you don't have to worry about balancing L1 and L2
2) Put the units in split-phase and treat input and output as split phase (even though you don't have 240 inside the RV). This allows you maximum flexibility with what AC service you can connect to, but limits each leg to 3kVA on the output side while inverting (may be OK for you) and you have to balance L1 and L2
3) Run the units standalone, one on each leg of AC; same 3kVA per leg limit applies

Unit 1 takes L1/Red + neutral and Unit 2 takes L2/Black + same neutral (white). The input and output neutrals should be the same length on both input and output (especially if you do split phase).
Click to expand...
I don't have the CCGX connected while configuring. Stopped trying after the second disconnect as I stated. When configuring, I just sit outside at the inverter. Configuring is not an issue. I can use both ve bus config and ve config plugged straight into the MPs. I originally tried through the CCGX, because my first training was that guy everyone references on you tube with his guide. After going through most the classes on VicPro website, I just started plugging straight into the MPs.

Right now I have them as you suggested #3. They run fine stand alone. My issue, is you can't see anything happening on the second Multi, unless I bought another CCGX.

I have been trying to split phase and parallel them. I can't get either to work. Split phase I get an overload light on the slave. Parallel they just keep clicking on and off. Honestly, constantly reconfiguring the wiring has probably ruined all of my "measured" runs.

I'd prefer running them split, but I just get that overload light every time.
 
OK, so is the wiring for split phase the way I described it? You can see my diagram here:
NH%20Electrical%20V4-Page-1.png
 
cinergi said:
OK, so is the wiring for split phase the way I described it? You can see my diagram here:
NH%20Electrical%20V4-Page-1.png
Click to expand...
That is how I wired it for split. Only difference is my grounds are grounded to a grounding block from the MPs AC ins and outs and then grounded to the frame.

Wired that way, then configured for split, the slave overloads (overload light comes on and it turns off
 
First thing that jumps at me (not the issue) is that you have AC-IN-2, where that should say AC-OUT-2 on those.

Second thing (could be your issue) is that your ground between units seems to be floating in the diagram. Shore ground should tie to both master and slave units.
Output ground should tie from master to slave output ground and go to the panel.
 
Final thoughts - in my 5th wheel, there isn't a single device that actually uses split phase power. I have a 50a feed, L1 and L2, but nothing uses both sides for anything. I suspect that you don't actually need split phase service, so you can just use the parallel configuration rather than the split phase configuration.
 
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