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Battery to Bus wire size

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  • Battery to Bus wire size

    I have two LiFePo4 100 ah Batteries wired in parallel, using 2/0 cables. What size wire should I use to connect the batteries to the BUS bar? I will connect a 2000 watt inverter to this bar.
    First build, clueless..

  • #2
    When I’ve done voltage loss calculations for battery runs, usually voltage loss is negligible compared to what an ampacity chart says wire should be. All depends on voltage for your inverter whether 12 volt, 24 volt, or 48 volt. Here’s an ampacity chart:

    044702F5-BB17-4F0F-B74A-BFFABF61DDA5.jpeg
    A 2000 watt inverter ought to be on a 24 volt system.

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    • #3
      Waiting to learn what your system voltage is. 2000w inverter should be on a 24V system and batteries sized to handle the expected loads. 100ah @ 24v is not a good match to a 2kw inverter.
      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
        Thank you. My system is 12 volt. 2000 watt inverter. Inverter Lable reads: Input DC 11v-15v 200A 2400w and AC Output 115v 17.4 A.. Will it be ok to use the 2/0 AWG cable to connect inverter to BUS bar?

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        • #5
          Originally posted by anne2263 View Post
          Thank you. My system is 12 volt. 2000 watt inverter. Inverter Lable reads: Input DC 11v-15v 200A 2400w and AC Output 115v 17.4 A.. Will it be ok to use the 2/0 AWG cable to connect inverter to BUS bar?
          12V 2000w ( likely 3,000w peak)
          3000/12= 250amps = 4/0 wire

          2/0 wire is only rated to 175A

          If there is much length, you may need larger wire to reduce voltage drop to prevent inverter shutdown from undervoltage.

          https://lugsdirect.com/WireCurrentAm...ble-301-16.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

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