How are you creating 240V split-phase power?

williatywilliaty Solar Expert Posts: 60 ✭✭
I've been reading about running mini-split systems off solar lately and all of the high-SEER models being mentioned are 240V split phase. How are you guys creating this? I have a Victron Multiplus making 120V single phase. Their 240V models are 240V single phase and require a autotransformer to synthesize 240V split phase for US appliances. Looking though NAWS's catalog, only a very few inverters are sold that make 240V split phase directly and the forums are full of people having problems with them.

So, how are those of you who are using 240V split phase creating it?


  • Dave AngeliniDave Angelini Solar Expert Posts: 6,138 ✭✭✭✭✭
    Schneider XW and CSW, Outback Radian. Not having any problems with them since day one.
    Ok, a few glitches in hundreds of offgrid homes. The biggest problems are from people not configuring them properly with the grid. They really are not DIY unless you have put the work in to be qualified and knowledgeable. If it were easy you could do it on youtube ;)
    "we go where power lines don't" Sierra Mountains near Mariposa/Yosemite CA
    E-mail [email protected]

  • mike95490mike95490 Solar Expert Posts: 9,571 ✭✭✭✭✭
    Schneider XW here.  no issues at all.  legs are properly balanced (one time thing when you configure the main breaker panel) inverter inverts & charges just fine for the last 10 years (new spare in the box awaiting install)
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    gen: ,

  • RCinFLARCinFLA Solar Expert Posts: 1,453 ✭✭✭✭
    edited August 2020 #4
    Most mini-splits are inverter three phase compressor units with little starting surge current.  You can get up to 15k BTU units that run on 120vac.  That is the limit to run on normal 15A 120vac power outlet.

    Other option is regular air cond unit with softstart/start cap boost to cut down startup surge curent.  See MicroAir EasyStart.  All the RV guys are using one of these to run their 15k BTU 120vac air cond on 2200 watt Honda inverter generators.
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