Old 04-19-2012, 11:58 PM #1
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Default Math/Electricity HELP!!!

Hey Guys,

I am horrible at math and need help.

I am considering getting a 12vdc 50watt submersible pump. I need help figuring out how much it will cost to run 12 hours a day.

i will be converting 120vac from my home with a variac and a rectifier.

will this set up have significant electriciy bill savings over just using a 120vac 20watt pump???

It's ok for you to laugh at me lol


Michael.


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Old 04-20-2012, 12:59 AM #2
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Default Re: Math/Electricity HELP!!!

No, a 20 watt 120 vac pump will consume 20 watts. A 50 watt 12 volt model will consume 50 watts, PLUS whatever is lost in the variac and rectifier (for a total of 60 watts or so).

Here in the netherlands we have a rule of thumb that running 1 watt 365x24 costs roughly 2 euros a year. In the US this figure will be lower (perhaps $1.50 or so) since your energy taxes arent as bad as ours.
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Old 04-20-2012, 02:12 AM #3
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Default Re: Math/Electricity HELP!!!

This is where I lose the concept or over think it... So 20 watts @ 12vdc will cost more than 15 watts @120vac? Since I'm reducing the ac so much I thought I'd save a ton

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Old 04-20-2012, 02:14 AM #4
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Default Re: Math/Electricity HELP!!!

A watt is a watt is a watt, no matter the voltage. You pay for electricity by the watt.

It could be 50Watts at 10,000V and still cost less than 100Watts at 12V.

(Volts x Amps = Watts)
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Old 04-20-2012, 02:17 AM #5
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Default Re: Math/Electricity HELP!!!

Thank you guys. It's amazing how simple something can be when explained properly.

Michael
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