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# Is 220v pump cheaper to run than 120v pump?

#1
08-09-00, 09:31 AM
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I'm about to replace my water pump that runs on 120v. People tell me that a 220v pump is cheaper to operate. Since I buy hydro by the KW/h, and it appears that a 220v pump uses 1/2 the amperage, I would think the cost is (very close to) identical.
How does 220v save money.

#2
08-09-00, 06:10 PM
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hello ding dong,
ok here is why 240 is cheaper to run then 120. in your wires there is resitance, since ther is resistance there is power loss, the lower the amps the lower the power loss. if amps doubled the power loss would quadruple.
the forluma for power loss is I x I x R
I = amps
R = resistance
useing this forluma with a resitance of 10, 5 amps and 10 amps
5 x 5 x 10 = 250 (240 V)
10 x 10 x 10 = 1000 (120)

#3
08-09-00, 08:46 PM
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i have seen this point argued up and down if there is any savings it is so little that you won't notice it that's my opinion if you have a pump that draws 10 amps at 120 volts it draws 5 amps at 240 volts per leg which still adds up to 10 amps. What it does do is allow you to run smaller wires and a smaller breaker

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