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240 vs 120 v.

Posted by BobB on April 27th, 2001 08:49 AM
In reply to Will a spa run cheaper on 240V vs. 120V by Kevin on April 27th, 2001 01:46 AM [Go to top of thread]

Kevin: Hope you don't mind my 2c worth:
The energy consumption of the spa itself ( motor, heater, etc..) will not change with the voltage level. There are very slight efficiency differences in motors but it is not signifigant.
Without getting too technical a kwh is one thousand watts for one hour. Watts are approximately equal to volts times amps. For most loads, if the volts go up, the amps go down, and the watts stay about the same.
What does change a lot however is the loss factor in the supply line from the spa to the service panel. This electrical loss is seen as light dimming when a load like a motor ( typically a regrigerator motor, or air conditioner motor ) starts. If your spa is very far from the electrical panel, you can reduce the losses in the line, and improve the voltage at the spa by converting to the higher voltage. This is signifigant because the losses vary with the square of the current.
All this being said, however, if you already have the spa, and it is already being operated at 120v, and it seems to work OK you will probably never save enough money in operating cost to pay back the electricians cost to convert the supply line. But if it is a new installation, it won't cost much more to install initially at 240v.
Hope this isn't too long winded.

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