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Grid tie a 3 phase system to a single phase service

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  • Grid tie a 3 phase system to a single phase service

    Hello Everyone. I recently acquired a complete system from an industrial setting. It consists of 3 arrays (14 panels each), three Outback GVFX 3648 inverters, three FM80 charge controllers and six Rolls Surette batteries. The system is equipped with an autotransformer and is setup to output 480 volts 3 phase. I want to maintain the three phase power for use in my workshop as only single phase is available from the utility. I want to tie this to the grid, but not sure what the implications are of the three phase system vs. the single phase service. I'm not worried about the voltage as I have the ability to drop the voltage at the autotransformer or use another standalone transformer that I have kicking around. I'd like to hear thoughts, opinions, etc on what approach I might take for grid tie of this system. Thanks in advance.

    -Arthur

  • #2
    How do you plan to interface a 3 Phase Grid Tie PV system into a Single Phase Main Panel?

    Solution #1 = Upgrade your Main Panel from Single Phase to 3 Phase Service to match the Outback configuration
    Solution #2 = Rewire the Outback Grid-Tie Inverters as Single Phase.
    Solution #3 = 3 Phase off-grid and waste all unused PV Kilowatt-Hours
    Last edited by NEOH; 11-15-2017, 12:48 PM.

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    • #3
      I have a utility fed single phase panel that powers lights, outlets and a 30 HP Phase converter. The phase converter powers a 3 phase panel that is used for machinery loads. The three phase panel also has an MTS connected to a 40 KW diesel generator. The generator is only used if I need to run a three phase load larger than 30 HP.

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      • #4
        So, you think you will use PV 3ph to reduce the load off the 30hp converter?
        Powerfab top of pole PV mount (2) | 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

        solar: http://tinyurl.com/LMR-Solar
        gen: http://tinyurl.com/LMR-Lister

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        • #5
          No. just to run smaller three phase loads, most of which are run through frequency drives today.

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          • #6
            The GVFX units can be stacked in single phase or split phase instead of three phase.
            OutBack FP1 w/ CS6P-250P http://bit.ly/1Sg5VNH

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