What must run from batteries? Or Genie?

Discussion in 'Power cuts' started by RiaanP, 22 Sep 2009.

  1. RiaanP

    RiaanP Moderator

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    What is the absolute minimum that needs to run when the power goes out? Do I need 3KW genie or big inverter to run the tank? On average I had power outages that last around 4 hours. The max we had was 6.

    Is lights needed? Do get dark and stormy days out at sea. So I doubt if lights are that needed for that 4 hours, just open the curtains...When power do come on later maybe run the lights an hour or two later that day. Something wrong with this approach?

    Heaters? How much can the temp drop in 4 hours?

    Scrubber could be a problem, but just disconnect it and let it lie in the sump to prevent it drying out. I mean the algae are used to some periods of darkness anyway.

    30 to 50 times water movement in the tank? Is that really needed? Or can tank and fish relax for 4 hours of calm seas?

    DSB, yes there is an problem, that needs some movement. Will 50% of normal flow kill all life forms within the DSB?

    Water movement in display for oxygen uptake. Well if battery driven air pump can solve this... why have strong flows for this period?

    Skimmer? I do not know? Will the pollutants build up that mush if my skimmer is out of action for 4 hours?

    Or do you need just some circulation between sump to display tank. Like a battery driven bilge pump?

    Or did I answer myself?
     
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  3. brentnorm

    brentnorm

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    Return pump would be my number one and everything else is extra. Perhaps 1 heater if you really want too.
     
  4. lIghty

    lIghty

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    Assuming that your return pump creates flow over your DSB, I would Say

    RETURN
    Pump for ATS
    HEATER (Depending on Climate of your area)

    A gennie works out much cheaper than a inverter setup, how ever this means you would manually have to connect the system to it, where as a Inverter setup "can" be made to switch automatically.

    Also with a gennie, generally you could run 90% of the system without any problems....
     
  5. martin

    martin Reef Adict

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    Always the biggest you can afford the better.
    4-6hrs outage
    Return pump but flow should be sufficient for oxygenation so perhaps a seio & return.
    If return would cater for dsb good otherwise a feeder for dsb.
    Lights are not a problem they can be off for long periods but lights also help heat in winter.
    Also enough power for a heater in winter as we could be in for longer loadshedding with a22holes 27% increase they might not be able to afford 5th grade coal.
    Riaan the biggest longest most powerful you can afford is always best without overkill.
    flow
     
  6. RiaanP

    RiaanP Thread Starter Moderator

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    Just one clarification.
    Return pump will overflow back to sump and keep DSB up.
    Smallest bilge pumps are 500GPH or 1892L/h. That should be enough to keep DT slightly moving for oxygenation and to give DSB enough flow.

    You get bigger pumps but they will run the batteries flat in double time.

    And as in my current setup, it "drives" the scrubber as well.
     
  7. Tony

    Tony

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    Look at the worst case scenario. If the power is out for 24 hours then no inverter will sustain that tank. A gennie will go as long as there is fuel in it. The power of the gennie will depend on the power consumption of the tank especially the lighting
     
  8. mariusmeyer

    mariusmeyer

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    I worked out that I can run a 40W return pump doing 1000LPH after head loss (2 X total turnover) plus a 12W 5000LPH sunsun circulation pump for 21hours off of a single 102aH battery.

    The return pump will give enough oxygen and the 5000LPH internal circulation should keep the water well mixed. If you want to add extra oxygen then add a 3W airpump to the sump but that will only give you 20hours then.

    On 2 102Ah batteries I am planning on running my 40W return pump, 1 circulation pump and my OCTX200 skimmer and that should last for 24 hours.
     
  9. Monti

    Monti

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    Just the return pump, ATS pump, heater and maybe if you can, an internal circulation (to help keep oxygen up).

    Dont bother with lighting- corals can go a day or two without lights without any ill effect.
     
  10. RiaanP

    RiaanP Thread Starter Moderator

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    Marius, are you sure?

    A battery rated at 100 A·h will deliver 5 A over a 20 hour period at room temperature (20 degrees Celsius)

    Battery (electricity - Wikipedia, the free encyclopedia)

    What are the Amp ratings on your return pump and the Sunsun pump?
     
  11. justinM

    justinM

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    got a brand new 6.5 KVA gene at a sale for 3 grand. when the power goes off, i just disconnect the geyser and stove, backfeed through a plug point and vuwala! the only house in the neighbourhood with everything running (including my entire tank) definately the easiest option
     
  12. mariusmeyer

    mariusmeyer

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    The inverter has minimum efficiency of 90% so for the return pump it is 40W / 0.9 = 44.4W load on battery. 44.4W /12V (supply voltage) = 3.7A.

    For the sunsun pump it is (12W / 0.9) / 12 = 1.11A

    Total of 4.81A.
     
  13. lIghty

    lIghty

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    Got point Tony, as long as you have fuel its not a problem!
     
  14. RiaanP

    RiaanP Thread Starter Moderator

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    Cool, so I learn every day. Thank you Marius. Question, what is the price for inverter and a 105aH deep cycle battery?

    Also I read up this morning that a deep cycle battery should not drain to less that 20% capacity. There are even types that should not go below 50%. Does inverters auto shut down at this point or will they keep on draining the battery? Or is that up to intelligent inverters that will cost you your other arm?
     
  15. mariusmeyer

    mariusmeyer

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    Deep cycle batteries can and will drain to almost 90-95%. This is what they are designed for. Normal car batteries should not be drained that far as they are designed for big bursts of power but for a short period of time.

    Price wise depends. A 102Ah deep cycle battery is around R1100 a battery and an 1200W inverter (modified sine) is around R1300.The inverter is 12V which means you can start off with just a single battery and when you have more cash just add extra batteries.
     
  16. RiaanP

    RiaanP Thread Starter Moderator

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    Ok, went of topic a bit, comparing what is better between Batteries and inverters against generator. That in itself is another discussion.

    Original question, what is the minimum that must be running when the power goes out.
    Or
    What is the minimal needed to ensure survival if the power is out for 4 to 6 hours.

    Trying to justify at least R2500 to spend on power alternatives to the Department of Finance for a system less that is less than 300L. :(
    (Sure if you have the cash... you can build your own power plant...)
     
  17. mariusmeyer

    mariusmeyer

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    A return pump and circulation pump. And an additional air pump if you have a big bioload.
     
  18. Nemos Janitor

    Nemos Janitor

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    What happens when the eskom power comes back on?
     
  19. brentnorm

    brentnorm

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    I have heard rumours that it is a possibility.:whistling:
     
  20. Nemos Janitor

    Nemos Janitor

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    Jup, I think it could be very interesting if the generator is running and eskom power comes back on.
     
  21. jacquesb

    jacquesb Retired Moderator

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    LOL - then you supply ESKOM WITH POWER! ;)

    Seriously - I think that this might cause issues? Where are the "sparkies" (or rather "electricial specialists" out there?)

    Alan?
     
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