backup power supply help

Discussion in 'Power cuts' started by bfreeman, 29 Jun 2014.

  1. bfreeman


    2 Mar 2011
    Likes Received:
    so given the recent load shedding this year I decided it was time to build a back up power supply for my tank. got an electrician to build me the power supply and this is what I have landed up with,

    6 amp, 12-84ah charger
    45ah battery (which I swopped as only a 7ah was supplied)
    800w Omega 12v dc to ac 230v inverter (doesnt say what sinewave)

    I have the following pumps,

    fluval 205 canister filter (10w)
    fluval 306 canister filter (15w)

    now here is the problem.....when I try and connect the pumps to inverter then the motors start clicking, if im lucky a single motor will run for about an hour before it stops......and I cant get them to both run together. and to top it off this is while its still connected to the mains.....

    please advise urgently as im worried for my fish
  2. Guest

  3. viper357

    viper357 Admin MASA Contributor

    4 May 2007
    Likes Received:
    From my understanding, that is due to your inverter, you'll need a pure sine wave inverter. There seem to be a couple of older types of pumps that will run fine on a normal inverter, but generally, a pure sine wave inverter is what you'll need for newer pumps and to run your controllers etc.
  4. Philip.Cloete


    21 Dec 2010
    Likes Received:
    Secunda Mpumalanga
    Or use dc pumps they work fine on modified sine wave.
    Imo it would be cheaper to get dc pumps than to het a true sine wave inverter.
    Maybe I just looked at the wrong places for an inverter but thats the 2 options you have.

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