Backup Power

Discussion in 'Test Kits, Controllers, Reactors and Dosers' started by preshan, 1 Jun 2007.

  1. preshan

    preshan <img src="/images/ecrccom.gif">

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    Hi guys i just installed a 3kva ups on my tank and have decided to only plug the return pump , resun waver and 2 seios on controller to this ups so that
    i can get the longest backup time in the event of power failure.
    what do you guys think
    how long backup time would this ups have
    there are 16 batterys 7amps each on the ups
    total watts used is +- 200 watts

    Preshan
     
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  3. Mekaeel

    Mekaeel Moderator MASA Contributor

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    did you buy it from EJ?
     
  4. preshan

    preshan Thread Starter <img src="/images/ecrccom.gif">

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    No i got it from a customer who didnt want to spend money on repairing it
    so i put in new batterys and charger card
     
  5. viper357

    viper357 Admin MASA Contributor

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    I would also connect a small heater just in case.
     
  6. Mekaeel

    Mekaeel Moderator MASA Contributor

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    guess we all need need to start investing in a genarator to be on the safe side
     
  7. Ridwaan

    Ridwaan

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    I am in the process of investigating solar power backup.
     
  8. ed

    ed

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    we get lots of power outages, just bought a 5.5kw generator for checkers to keep things going, will run all my pumps just without the lights
     
  9. DragonReef

    DragonReef

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    Hey edd welcome to MASA.
     
  10. djmurray

    djmurray Email me about anything

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    Oh my system i had a system that ran off a 24v backup kit and it ran my system for +/- 12-14 shours with everything and 36+ with just a pump and heater
     
  11. Alan

    Alan Admin MASA Contributor

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    This is a very good idea. UPS back ups are fine for short power outages, but when you start getting to the 1, 2 or 3 day outages you will find you will need a generator. The problem with a genny is they are very noisy.
     
  12. Dober Man

    Dober Man

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    Preshan, post how many watts your return pump and seios are drawing, and i can tell you exactly hopw long your back up will be.
     
  13. dendrosa

    dendrosa Member

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    From his message it looks like total power consumption of 200 W. With 16 battries of 7 Amps ea would be 112 amp hrs. Based on this, backup would last abot 4.5 days. I agree with Viper, I would add a heater, but even with a 200W heater backup should last for two days easily.
     
  14. Dober Man

    Dober Man

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    Your discharge current on that load with a bank of 16 12V batteries would be 1 Amp. So in actual fact, you'll get about 12 hours max.
     
  15. dendrosa

    dendrosa Member

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    Surely if you have 16 batteries of 7amps ea, you have 112 Amp hrs. If you are drawing 1 amp per hour roughly ( 200W / 220V) that is roughly 112 hours?
     
  16. Dober Man

    Dober Man

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    Your discharge current of 1 Amp is only because you have so many batteries in series. If you had a discharge current of 1 Amp on 12V, then yes, you would get huge back up. To work out discharge current, divide the watts of the load by the total voltage of the batteries in series.
     
  17. dendrosa

    dendrosa Member

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    But why would you put the batteries in series? Your invertor converts 12 DC volts to 220 volts AC. By putting batteries in series you have 192 V DC . Not what you want.
     
  18. Dober Man

    Dober Man

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    The invertors in UPS's aren't 12V. They make them to suit the total DC bus.

    UPS manufacturers as a rule of thumb do not make their UPS's with all the batteries in parallel. With large units, you would have two banks of betteries in series, and parallel the two.

    Even if all 16 of his batteries were in parallel, his discharge current would be 16.66, and with one 12V 7ah he would only get about 25 minutes or so.
     
  19. Copperband

    Copperband

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    Supermoo, would you then rather suggest a gennie rather than a UPS?
     
  20. Dober Man

    Dober Man

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    I would rather have a small genny, but you would need a UPS to regulate the output of it. A 1 kVA Line interactive UPS, and a genny with and AVR is the answer.
     
  21. Copperband

    Copperband

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    I need to spec the size of the genny for the big tank also might as well then run fridge and freezer as well.
     
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