How many relays for more than one dump load?

Discussion in 'Dump Loads' started by windy_question, Oct 19, 2009.

  1. windy_question

    windy_question WindyNation Engineer

    Need a clarification because I'm about to raise my WindyNation 500W PMA on a tower.

    I have a 40 amp controller, rectifier, one 40 amp relay, two 12 V dump loads. I just wasn't not sure if I should have one or two 40 amps relay because of two dump loads?
  2. windyguru

    windyguru WindyNation Expert

    The 40 amp relay can handle 40 amps at continuous duty. Depending on where you set your dump voltage, each 300 Watt, 0.73 ohm resistor will consume about 20 amps. Therefore two will consume 40 amps in total. While you would probably be fine with one relay, it would be a good idea to use 2 relays and have a resistor hooked up to each relay.
    TomT likes this.

Share This Page