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PostPosted: Jan 5th, '17, 10:41 
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Joined: Jan 2nd, '17, 21:52
Posts: 8
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Location: Beechboro, Western Australia
Hi all, on the process of choosing my pump, I made this little Running Cost calculator According to Energy consumption. I thought it can be useful so I'm sharing it.
http://goo.gl/bGzssb

How it works:
Simple change the grey area with your values
Cell 1: Enter your local electricity Unit charge, a Unit is = 1kWh , here in Western Australia we only have one option of Energy provider, as of Dec/16 the Unit was $0.24073

Cell 2 - Enter the pump (or any other element) Wattage consumption as per manufactory, I'm using Aquapro HP1100, so it's 37 Watts

Cell 3 - Enter the amount of daily hours your pump will run, in my case it is continuous = 24h .. but if you are on a timer eg 30 mins on 30 off than is half day on = 12h, etc...

You should now find your running costs per day, month, year, etc... Pretty useful to compare the cost benefits of pumps and all elements really, aerators, timers or anything really...

By the way, on time of sharing this spreadsheet, I added a comparation tab, follows the same process but there are 4 cases to be easily compared... Example

Case study 1 - Solar or plugged in pump ?
I needed to move around 1000L/h

Aquapro HP1100 - 37w consumption
Pump price: $59.90 *assuming you have a power point installed near by, Electrician fees to install one might be considerably
Year run. cost: $78.01

Solar pump
Pump cost: $259
Year run: $0

Conclusion: That would take 2.55 years for the solar pump pay it's value in running costs


Case study 2 - Continuous flow versus timer
Continuous flow set-up
Aquapro HP1100 - 37w consumption operating 24h day
Year run. cost: $78.01
Pump price: $59.90


Pump 2 (2000L at 1m head p/h - 75w consumption operating 12h day)
Year run. cost: $79.06
Pump price: $119.90
Timer Price: $49.90
Timer running cost (10w running 24h) : $1.73

Conclusion: Monthly running costs are pretty similar but initial set up cost on pump 2 is $109.9 higher...

*This examples below are only considering set up and running costs on the closest possible outcome (move 1000L / h of water), technical advantages or disadvantages, brand quality, personal preference etc are also important and should be considered.

Hope this can be helpful to anyone :)


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PostPosted: Jan 5th, '17, 11:01 
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Joined: Mar 9th, '13, 10:44
Posts: 3368
Location: Loomberah NSW
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Good work, not really useful for me though- it all runs on solar power here :)

Keep in mind that claimed wattages are not necessarily real values- you need to measure the actual consumption of a pump to get accurate costs with your calculator. Some are quite close, but some consume a lot more than claimed.

BTW, timer power use is measured in millwatts, rather than 10W- it would get very hot if it used 10W!

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My small AP system: http://backyardaquaponics.com/forum/viewtopic.php?f=18&t=16345
Larger 2nd system: http://www.backyardaquaponics.com/forum/viewtopic.php?f=18&t=24153
Solar powered Gunagulla Organic Garden
Fruit +Loomberah Wx
http://gunagulla.com


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