running hot tub from alternate energy

Discussion in 'Electrical Forum discussion & Blog' started by twrh111, Dec 19, 2012.

  1. twrh111

    twrh111 New Member

    Messages:
    1
    Location:
    ark.
    hello, newbie here, i do have an understanding of electricity both ac/dc. i have a 220v 4 wire hot tub wired to specs that i would like to run off a battery bank. my question is, can a hot tub be wired to work on 110v. i have a 10 battery bank wired as a 12v system being recharged with wind power. each battery has a minimum 500 cranking amps. so, rewire the tub or convert and step up my power to 220v. thx, terry
  2. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Let's say the hot tub uses 30 amps @ 240. That is about 7.5KW. It would need 60 amps at 120, meaning bigger wires. But KV is KV.
    At 12 volts, the battery would need to supply 600 amps.

    The CCA rating of a battery is not meaningful here...that is a short term spec for the starter of a vehicle. The steady state draw is much less. You need to know the total KWH rating to know how long it would power the tub
  3. jwelectric

    jwelectric Electrical Contractor/Instructor

    Messages:
    2,542
    Location:
    North Carolina
    This question would beg to differ with this statement

    No
    No matter if you have an inverter or not the power or wattage comsumed will be the same and I don't think you hardly have enough
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