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How to connect Victron Multiplus 12v 3000 to AC/Grid

lucl

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Jan 6, 2022
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Hi guys,

I got the Victron Multiplus 12v 3000 120v inverter today and I've read the manual.

I am using in a home application (not in an RV). It will charge a battery bank when grid is online and power a few things when the grid is offline (from battery bank).

One thing I'm not clear on is that the manual states the AC INPUT CURRENT is 50A. But regular household breakers typically go up to 20A max. So what is the right way to connect this inverter's "AC IN" to the breaker box? Should I be supplying 50A, and if so how is that done with an 120v setup? Or do I need to connect it to a fresh 50A breaker in the main grid's breaker box?

I guess the reason this is important is that the Multiplus can charge batteries at up to 110A (90A default) so I want to make sure I'm understanding its input requirements correctly.

I know RVs have 50A breakers in them but I'm hooking this up at home.

Thanks!
Luc
 
Last edited:
Is this the manual you look at?

Page 15:
The terminal blocks can be found on the printed circuit board, see appendix A. The shore or mains cable must be connected to the MultiPlus with the aid of a three-wire cable. - The AC input cable can be connected to the terminal block “AC–in”. The AC input must be protected by a fuse or magnetic circuit breaker rated at 50A or less, and cable cross-section must be sized accordingly. If the input AC supply is rated at a lower value, the fuse or magnetic circuit breaker should be down sized accordingly. - The AC output cable can be connected directly to the terminal block "AC-out". With its PowerAssist feature the MultiPlus can add up to 5kVA (that is 3000 / 120 = 25A) to the output during periods of peak power requirement. Together with a maximum input current of 50A this means that the output can supply up to 50 + 25 = 75A. An earth leakage circuit breaker and a fuse or circuit breaker rated to support the expected load must be included in series with the output, and cable crosssection must be sized accordingly. The maximum rating of the fuse or circuit breaker is 75A.

75A x 120V = 9000W output due to Power Assist feature per Victron example above, so if your AC can supply 20A, then you will have 2400W + 3000W = 5400W available at the output.
 
You can install a 50 amp breaker in your home panel and run the appropriate sized wire to the Multiplus.
 
You can install a 50 amp breaker in your home panel and run the appropriate sized wire to the Multiplus.
Hmm. But is it possible to have a single phase 50A breaker? I thought everything above 20A is 2 phase and requires those double breakers that connect to both circuits in the breaker box.
 
I'm not an electrician and haven't done this but there are 50 amp single pole breakers for most major brand electrical panels.
 
Yes there are single phase 50a breakers. They are not as common- so may need to visit an electric speciality supply house.

The outputs on your multiplus should go to a sub-panel that has the breakers for all the loads you want the Multiplus to supply - when power is out.
 
Hi guys,

I got the Victron Multiplus 12v 3000 120v inverter today and I've read the manual.

I am using in a home application (not in an RV). It will charge a battery bank when grid is online and power a few things when the grid is offline (from battery bank).

One thing I'm not clear on is that the manual states the AC INPUT CURRENT is 50A. But regular household breakers typically go up to 20A max. So what is the right way to connect this inverter's "AC IN" to the breaker box? Should I be supplying 50A, and if so how is that done with an 120v setup? Or do I need to connect it to a fresh 50A breaker in the main grid's breaker box?

I guess the reason this is important is that the Multiplus can charge batteries at up to 110A (90A default) so I want to make sure I'm understanding its input requirements correctly.

I know RVs have 50A breakers in them but I'm hooking this up at home.

Thanks!
Luc
You can also tell it you are using a lower capacity circuit (maybe until you get an electrician to give you a larger line/breaker).

"AC input current limit 50A (= adjustable current limit for PowerControl and PowerAssist functions)"
 
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