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Thread: Generator Sizing

  1. #1
    Join Date
    May 2011
    Location
    West Palm Beach, FL
    Posts
    21

    Generator Sizing

    Trying to size size whole house generator using utility company KWH. Is there a calculation for this. Highest month being 14220 KWH

  2. #2
    Join Date
    Jan 2016
    Location
    PA
    Posts
    3,763
    Not really
    first detemine how you want to use
    days or hours?
    run close to normal
    or emergency bare bones
    select the things you want to run
    Then add up the loads

    heating/clg (use the higher)
    hot water
    cooking
    refrig
    a 1 kw misc(may not need to do this)
    gen might have plenty of capacity due to std sizes or increase in size required for motor starting (and only when starting)

    talk to a supplier
    they have sizing tools

    14000 or 1400 kwh/month?
    that is a $1400+ per month bill!
    >80'A per hr at 240 vac or 160 at 120 vac
    wow



  3. #3
    Join Date
    Jan 2016
    Location
    PA
    Posts
    3,763
    WAG using std dynural ratio

    14200 kw hrs per month / 30 days/month / 24 hrs/day ~ 20 kw (avg per hr) x 1.7 ~ 35 kw



  4. #4
    Join Date
    Jul 2006
    Location
    San Francisco, CA, USA
    Posts
    6,854
    Quote Originally Posted by Tom Drake View Post
    Trying to size size whole house generator using utility company KWH. Is there a calculation for this. Highest month being 14220 KWH
    Not really.

    14,220kWH could be 14,220kW for one hour, 200kW for 2 hours per day, or 19kW running 24/7 for 1 month. So which value would you use to pick a generator?
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