wire size

Would you use 10/3 Romex  solid to join a 2500 watt inverter  120v to a mains panel 65 ft away?


  • mcgivormcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    Romex or NMD 90 has restrictions for its useage, particularly with regards to mechanical protection, if running a single 120V circuit a 2 conductor cable is all that's required Note. The third uninsulated ground in a 10/2 is not counted as a conductor.

    For 65 feet with 10 AWG the voltage drop would be acceptable at 2500W load at 2.6% voltage drop https://www.calculator.net/voltage-drop-calculator.html?material=copper&wiresize=3.277&voltage=120&phase=ac&noofconductor=1&distance=65&distanceunit=feet&amperes=20&x=31&y=26
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS 
    Second system 1890W  3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.  
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
  • ws9876ws9876 Solar Expert Posts: 404 ✭✭✭
    would you use 10/2 romex solid from solar panels 50 ft to charge controller?? or would you use 2 pieces of 10 awg copper stranded?
  • BB.BB. Super Moderators, Administrators Posts: 32,027 admin
    Stranded or solid does not really matter electrically or for straight runs... Stranded will be much easier to bend and get around corners.

    When you get to larger AWG wiring (like 8 AWG or larger), it is generally easier to work with stranded.

    -Bill "I am not an electrician" B.
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • EstragonEstragon Registered Users Posts: 4,495 ✭✭✭✭✭
    I'd be inclined to use stranded if/where subject to vibration or other movement (wind etc).  Stranded can be tough to get properly  into a tight connector though.
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
Sign In or Register to comment.