UPS confusion

Discussion in 'Power cuts' started by rakabos, 17 Oct 2010.

  1. rakabos

    rakabos

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    Hi guys

    Feel like im beating a dead dog here but anyway i need some advice with regards to a UPS. I want to run the return pump, 30W or so and heater 200W. I need about 6 hours backup time. Now i know about sine wave and how the modified ones can cause damage etc.

    I am just not sure how the calculation works. So for the 230W i consume and 6 hours needed, what KVA UPS would i need? Would i require one with an inverter or would a sinewave pc type UPS do the trick?
     
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  3. mariusmeyer

    mariusmeyer

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    All UPS systems for PCs are modified sinewave. This is because the power supply inside the computer handles the conversion into DC. Personally I would not run the heater. Unless the tank is very small and it is very cold. But if you do want to then you calculations will be as follows.

    200W + 30W = 230W total. Devide this by the inverter efficiency %. Lets say the inverter is 85% efficient then it is 230 / 0.85% which gives you a total draw of 270.5Watts.

    Divide this watts by 12V as this will be the voltage of your new source of supply.

    This gives you a total amp draw of 22.54Amps. So in theory a 102AH battery will last 4.5 hours at full discharge. Many will come and say that you should not discharge a deep cycle battery more than 50%.

    I would not do a all in one UPS. I would rather go for an 300W inverter with a charger and deep cycle battery. You can then add more batteries in parallel as you have funds and want more backup time.
     
  4. rakabos

    rakabos Thread Starter

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    Thanks marius, that really helps

    Where in JHB would one buy this?
     
    Last edited: 17 Oct 2010
  5. mariusmeyer

    mariusmeyer

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    Will send you a PM from where I got mine.
     
  6. rakabos

    rakabos Thread Starter

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  7. butcherman

    butcherman Moderator MASA Contributor

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    Hey Marius can you pm me the details also?
     
  8. mariusmeyer

    mariusmeyer

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    Will do.
     
  9. butcherman

    butcherman Moderator MASA Contributor

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    wow that was fast :p thx :thumbup:
     
  10. mariusmeyer

    mariusmeyer

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    Copy and past is an amazing thing :)
     
  11. nepellew

    nepellew

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    help

    Please let me know were in durbs i can buy one eskom and there sheadding hahaha thanks:lol:
     
  12. Manic

    Manic Moderator

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    Builders warehouse by greenstone has one on special for R1499. You can add extra batteries to this one as well
     
  13. rakabos

    rakabos Thread Starter

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    Do you have any more info on this?
     
  14. LCornelius

    LCornelius Moderator

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    Make and model?
     
  15. nepellew

    nepellew

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    k

    Hi there im running a 50watt heater a Pump Set Bioflow 280 a resun sk-05 and two lights what is the nessity stuff to keep running i have and idiot in my house that likes to keep tripping the lights um i need to knw exactly what should run to keep them alive and what ups i need thanks again guys
     
  16. mariusmeyer

    mariusmeyer

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    The most important part is to keep oxygen throughout the entire system. If you have a sump then you can get away with just running the return pump. As it falls down the overflow it make enough oxygen. Lights can be turned off. Heater as well unless you have a very small system that will lose heat quickly. This is only an issue in winter as well. Tell us more about your system and then we could give you better recommendations.
     
  17. nepellew

    nepellew

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    k kewl

    Well my and is a juwel Rekord 600 Volume: approx. 63 Litres
    Measurements: 61 x 31 x 42 cm 1 x Pump Set Bioflow 280
    1 x Heater 50 Watt 1 x Resun Sk-05 skimmer two T8 one ocean sun light and the other coral sun light both 15 watt dat all im runnig for now
     
  18. mariusmeyer

    mariusmeyer

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    Since you dont have a sump you will have to keep the skimmer running so that it can supply the tank with oxygen. So just the internal pump and the skimmer would be ok. In winter you might have to keep the tank warm as 60L can cool down quite quickly in winter. You will need to know the wattage of the skimmer and the return to determine the current draw.
     
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  19. nepellew

    nepellew

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    kewl

    thanks my skimmer is 4 watts and my heater is 50watts my internal filter is 4.5watts so what kind of ups would i need
     
  20. rakabos

    rakabos Thread Starter

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    Ok

    So i have done a bit of googling.

    I can get this:

    Modified sinewave unit with 2 x 105 Ah deep cycle batteries and 1200W inverter/charger for R3500.

    The other option is a pure sinewave unit with 1 x 105Ah deep cycle battery and 600W inverter/charger for R3500

    So if one runs only the return pump which is about 40W or so it would give you A LOT of backup time, 10hrs+.

    Which option would you guys say is best and why
     
  21. rakabos

    rakabos Thread Starter

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    oh and thx to everyone especially Marius for the info
     
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