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2 inverters 450 ac run

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  • 2 inverters 450 ac run

    Hey all,
    Just wanna double check something. I got a existing ground rack system. 6000 inverter(240.vac). Were gonna add a new system. Existing home run wire size is 8 AWG at 450 feet. The new system will be 3000. Add a subpanel too combine both systems together. 6 kw and a new 3kw. Total 60 continuous amps at 450 feet. Change home run to 6 guage and add a 100 amp sub. Existing main is 400 amps. 400 buss. Seem correct?
    thanks
    Mike

  • #2
    No it is not good if you intend to run 60 amps continuous. The minimum will be size allowed is # 4 AWG copper, but at 450 feet you are going to be eaten alive with voltage drop and power losses.
    MSEE, PE

    Comment


    • #3
      Play with a few voltage drop / wire gauge calculators:

      an on-line voltage drop calc for AC runs: (3% loss)
      http://www.elec-toolbox.com/calculators/voltdrop.htm

      Dc or AC
      Voltage Drop Calculator :

      http://www.nooutage.com/vdrop.htm
      http://www.electrician2.com/vd_calculator.htm
      http://www.elec-toolbox.com/calculators/voltdrop.htm
      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

      Comment


      • #4
        Originally posted by So solar View Post
        .... Change home run to 6 guage and add a 100 amp sub. Existing main is 400 amps. 400 buss. Seem correct?

        Check your local codes / inspector as to how much they will allow per meter. You could possibly have enough to affect the pole transformer. You are pushing more than the average here, and may bump some obscure limit.
        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

        Comment


        • #5
          450' run

          losses will be great at 450' w/ #4. tables available in many places will show losses, thus acceptable line loss. #2 is going to cost $, but performance will be worth it.

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