Wiring a 120 Volt Mulitplus off-grid to 240 wired mobile home.

learaviator
learaviator Registered Users Posts: 12 ✭✭
edited August 9 in Off Grid Solar & Battery Systems #1
My home is currently being powered by a Magnum MS4024PAE, 120/240 volt inverter charger. I am switching everything over to Victron equipment, this Multiplus II install is the last piece. 
Nothing in the house is 240 volt, Everything is 120 volt. I am powering both line 1 and line 2 with the Magnum inverter. 
 I turned every possible thing on in the house at the same time and total system draw is 38 amps. Line 1 draw is 20 amps and line 2 draw is 18 amps so both legs are fairly well balanced. 
I bought a Victron Multiplus II, 120 volt, 5000 va inverter as I was told I really only needed the Quattro if I was hooking up to the grid. I was also told I can just hook a jumper between Line 1 and Line 2 and run this Multiplus II 120-volt inverter this way. 
Any thoughts on this? Also, I would like to keep the whole Magnum system as a backup, but trying to draw a schematic and figure devices needed is a later project. 

Thoughts on tying line 1 and line 2 together by using the Multiplus?

Thank You!

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  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,146 ✭✭✭✭✭
    edited 9:39AM #2
    I'm not sure  if that's okay with the Electrical code but jumper between  line one And Line 2 is the way to do it i probably use 8  or even six gauge wire

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric,  460 Ah. 24 volt LiFePo4 battery bank. Plenty of Baja Sea of Cortez sunshine.

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  • SumPower
    SumPower Registered Users Posts: 113 ✭✭
    #3
    learaviator said:

    Thoughts on tying line 1 and line 2 together by using the Multiplus?

    Thank You!

    This is done quit often. Just use the correct wire size and corresponding breaker size to protect the wire. Any jumpered panel I worked on I labeled or wrote on the panel schedule "120 volts single phase only". 
    When someone follows the work and sees a single pole breaker as the main, they will realize there is a single conductor feeding the panel and know that there is no 240 volt split phase available.

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  • Dave Angelini
    Dave Angelini Solar Expert Posts: 7,042 ✭✭✭✭✭✭
    edited 4:18PM #4
    As said, label it to make it clear. If there is existing insurance, they probably do not care as long as the area looks safe and normal. Make sure the breaker/wire gage that Victron recommends is used. The main breakers can just be a disconnect if they are larger.  Again, labels!
    "we go where power lines don't" Sierra Nevada mountain area
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    E-mail offgridsolar@sti.net

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