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Maths question help please
http://byap.backyardmagazines.com/forum/viewtopic.php?f=1&t=5829		 Page 1 of 2
Author:  bentaz [ Jul 16th, '09, 15:16 ]
Post subject:  Maths question help please
Could someone please help me with this, I'm a self confessed math spastic!
I would like to know how you work out how much it will cost to run a pump on my future system?

Its a 370w pump
The power costs basically 19 cents a Kw.
It will be run 15 mins on 45 off, so 6 hrs a day.

how do you work it out from there?
I'm sure there are some smart people out there in AP land.

Thanks in advance.
Author:  b2barker [ Jul 16th, '09, 15:22 ]
Post subject:  Re: Maths question help please
Power is charged in kW-hours.

0.37kW for 6 hours = 2.22kWh

At the rate you gave that's 42.18c per day

Other threads may help you to determine if a 370W pump actually uses 370W or more :?:

Allow for 50c per day, jobs done
Author:  Chappo [ Jul 16th, '09, 15:37 ]
Post subject:  Re: Maths question help please
Confirm the above,,,

And yes a 370Watt pump should be using very close to 370 Watts or it's broken/restricted etc.
Author:  Nocky [ Jul 16th, '09, 15:45 ]
Post subject:  Re: Maths question help please
you can get a lot lower wattage high volume pumps, mine is 12,000 litre per hour pump uses 175 watts runs 40min on 1 hour off works out at about $17 per month or 56c per day
Author:  Geoff2222 [ Jul 16th, '09, 15:49 ]
Post subject:  Re: Maths question help please
What sort of pump is that Nocky?
Author:  bentaz [ Jul 16th, '09, 15:59 ]
Post subject:  Re: Maths question help please
Geoff2222 wrote:
What sort of pump is that Nocky?

yeah what he said!

Thanks for the help guys
Author:  Chappo [ Jul 16th, '09, 16:00 ]
Post subject:  Re: Maths question help please
It's an old farm pump attached to a push bike:) Geeee his Mrs gets tired.
Author:  Chappo [ Jul 16th, '09, 16:13 ]
Post subject:  Re: Maths question help please
I'd guess when his better half tires of that bike ,, he plugs in one of these......

http://cgi.ebay.com.au/New-Jebao-12000L ... tsupported
Author:  KudaPucat [ Jul 16th, '09, 16:15 ]
Post subject:  Re: Maths question help please
I think Nocky uses a 10,000 lph tornado pump

Edit: See his thread here: Nocky Finally gets Serious, 6000lt System
Author:  bentaz [ Jul 16th, '09, 16:36 ]
Post subject:  Re: Maths question help please
[quote=

http://cgi.ebay.com.au/New-Jebao-12000L ... tsupported[/quote]
that would work out to just over 18 bucks a power bill!
thats great
Author:  Geoff2222 [ Jul 16th, '09, 17:10 ]
Post subject:  Re: Maths question help please
Kuda, Do you know how much one of these 10 klph tornado pumps are? Are they inline or submersible?
Author:  RupertofOZ [ Jul 16th, '09, 17:57 ]
Post subject:  Re: Maths question help please
http://www.rockaroundtheblock.com.au/pr ... 649&cID=63

Slightly cheaper than an Ebara Optima... and the Ebara is about 380w from memory.. :wink:
Author:  bentaz [ Jul 16th, '09, 18:37 ]
Post subject:  Re: Maths question help please
this is the pump I was looking at has anyone used these pumps
http://cgi.ebay.com.au/ws/eBayISAPI.dll ... 0068775343

Is head height measured from the pump or the surface of the water?
if that makes sense?
Author:  Geoff2222 [ Jul 16th, '09, 18:48 ]
Post subject:  Re: Maths question help please
Is head height measured from the pump or the surface of the water?
if that makes sense?[/quote]

From the surface of the water to the nearest outlet. That will be your head height.
Author:  Chappo [ Jul 16th, '09, 18:51 ]
Post subject:  Re: Maths question help please
I don't trust companies that fail to give data flows on their pump products.

With your head measurement DON'T forget piupe friction , elbows etc ,, they can easily double or triple the head your pump must push against
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