Voltage drop vs wire gauge

Guys, is there a way to figure out what will be the voltage drop for 100 ft of 14 awg wire? What difference a 10 awg would do?
Of course I can put a voltmeter to measure it, but is it predictible?

Comments

  • icarus
    icarus Solar Expert Posts: 5,436 ✭✭✭✭
    Re: Voltage drop vs wire gauge

    Try here,,,http://forum.solar-electric.com/showthread.php?t=29

    Tony
  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    Re: Voltage drop vs wire gauge
    CBHunter wrote: »
    Of course I can put a voltmeter to measure it, but is it predictible?

    Very predictable & repeatable.

    link:
    http://www.uwgb.edu/nevermab/voltage_drop_calculator_.xls

    Assuming 10A @ (for your 100ft (one-way) wire (@70F))
    14 ga 2.54V or 2.54%
    10 ga 1.00V 1.00%
    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

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

  • RCinFLA
    RCinFLA Solar Expert Posts: 1,484 ✭✭✭✭
    Re: Voltage drop vs wire gauge

    Wire Dia. Cir Ohm/1000' Vdrop
    Size Mils Inch^2 @20C I max. @ 100'
    00 364.8 0.1045 0.080 350.0 2.8
    0 324.9 0.0829 0.100 250.0 2.5
    1 289.3 0.0657 0.125 180.0 2.3
    2 257.6 0.0521 0.160 150.0 2.4
    3 229.4 0.0413 0.200 130.0 2.6
    4 204.3 0.0328 0.250 100.0 2.5
    6 162.0 0.0206 0.400 63.0 2.5
    8 128.5 0.0130 0.655 63.0 4.1
    10 101.9 0.0082 1.000 30.0 3.0
    12 80.81 0.0051 1.600 20.0 3.2
    14 64.08 0.0032 2.500 15.0 3.8

    Take resistance per 1000 feet, divide actual wire length by relation to 1000' (100' = 1/10 of 1000')

    Vdrop = I actual x times resistance of length of wire.

    For #14 with 15amps -> (2.5ohms for 1000') x (100'/1000') x 15 amps = 3.75v drop