50A Multiplus 12/3000 Inverter Kit with Smart Phase Selector


50A Multiplus 12/3000 Inverter Kit with Smart Phase Selector


This kit includes all the standard components for the do-it-yourself installation of a Victron 12/3000 inverter system on an RV with a 50A shore power/generator connection.

Steady State:  2400W
Surge:  6000W
Voltage Output:  120V AC
Voltage Input:  9.5-17V
Waveform:  Pure Sine
Frequency:  60hz
Charger:  120A
Passthrough:  50A
Efficiency:  93%
Dimensions:  H 14.3" x W 10.2" x D 8.6"
Extra:  Hybrid

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AM Solar Smart Phase Selector
The Smart Phase Selector greatly simplifies the inverter/charger installation process on a rig designed for a 50A service.  By installing our Smart Phase Selector box between the generator/shore transfer switch and the main AC panel, you no longer have to move AC loads in the main panel to accommodate the inverter’s limitation of only being able to handle one 120V 50A leg.  The Smart Phase Selector will distribute inverter output to both sides of the main panel.  Or, when plugged into a 50A service, the Smart Phase Selector will pass both legs from shore independently.  When Inverting or plugged into 30A and smaller service, the Smart Selector will send power to both sides of the main panel, passing through the inverter.  This allows power assist to function properly, preventing the shore breaker from blowing.

We do not currently sell the AM Solar Smart Phase Selector as a point-and-click item by itself on the website because of its complexity and potential compatibility issues with other system components. If you would like to order a Smart Phase Selector, give us a call and we will help you make sure it is the right product for your application.

The AM Solar Smart Phase Selector is not currently designed to work with generators that have L1 and L2 in phase. L1 and L2 need to be 180 degrees out of phase, like a 50A shore power connection, otherwise the Smart Phase Selector will only send L1 to both sides of the main panel, effectively giving you only half current.

The MultiPlus is a powerful true sine wave inverter, a sophisticated battery charger that features adaptive charge technology and a high-speed AC transfer switch in a single compact enclosure. Models range from 800VA to 5000VA per module.

Unique PowerAssist feature
The MultiPlus will prevent overload of a limited AC source. First, battery charging will automatically be reduced when otherwise an overload would occur. The second level will boost the output of a generator or shore side supply with power taken from the battery.

Uninterrupted AC power (UPS function) 
In the event of a grid failure or shore or generator power being disconnected, the inverter within the Multi is automatically activated and takes over the supply to the connected loads. This happens so fast (less than 20 milliseconds) that computers and other electronic equipment will continue to operate without disruption. 

Virtually unlimited power thanks to parallel operation
Up to 6 Multis can operate in parallel to achieve higher power output. Three phase or split phase operation is also possible. Please check our datasheets to see which models have paralleling, three phase and split phase capabilities.

Victron Multiplus inverter/chargers must be programmed

Multiplus Inverter/Charger Programming

AM Solar will update the firmware and program the proper settings into your inverter before it is shipped to you.

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To program a Multiplus inverter/charger you will need to have basic PC skills.  A Mac can be made to work, but not consistently.  We do not support Mac programming.  Your PC skills should include the ability to download files and programs, open programs, and connect to devices via a USB port.  You can read the programming instructions here.

Aside from the Multiplus inverter/charger, you will need the following:
• PC Computer (preferably a laptop)
• MK-3 to USB Adapter (Supplied with complete inverter kits)
• UTP RJ45 Cable (Supplied with complete inverter kits)
• DC Power supplied to the unit (This can be supplied by your house battery)
• Internet Connection (For downloading files, the programming can be done offline once the files are downloaded)

If anything above sounded potentially frustrating or completely outside of your abilities, AM Solar can pre-program your inverter for $100.  If you already have your inverter and find that you cannot program it, you can ship it back to us, pay the programming fee, and we will send it back to you, fully programmed.

Installation Diagrams:

Wiring Diagram (AGM or Drop-in Lithium)
Smart Phase Selector Diagram
Smart Phase Selector Description
Programming Instructions

What you get:

1x INV-VT-3000 PMP123021102 MultiPlus 12/3000/120-50 120V VE.Bus Inverter/Charger
1x MONITOR-VTDM DMC000200000R Digital M. Contr.200/200A GX
1x CABLE-VT-RJ45-5 ASS030065000 RJ45 UTP Cable 5 m
1x CABLE-VT-MK3USB ASS030140000 Victron MK3-USB Interface
1x 50-TSFMB1 Smart Phase Selector 50A V1.0
8x LUG-4/0-RING-3/8 4/0 Lug-3/8" Ring
12' CABLE-4/0-1-BLK Cable 4/0
6x 93H-R3/4 Heat Shrink Red 1.5" x 3/4"
2x 93H-B3/4 Heat Shrink Black 1.5" x 3/4"
1x 95F-CLST-400A 400A Class T Fuse & Holder
1x FUSE-CLST-400A Spare 400 Amp Fuse
1x WIRETIE-05 GT-40S-0 Black Wire Tie 5-7/8"
1x 93S-MINI Switch-Mini On/OFF with Screws
16' CABLE-6GA-3-GRY Stranded 6/3

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Due to the delicate nature of the electronics and high cost of shipping, all inverter sales are final.  If there is a problem with your unit we can connect you with the manufacturer's tech support team to resolve any potential warranty issues.


AM Solar Part Number:  99-VT3050KIT, Smart ATS