[OAC_Sparky]

Blackzx3,Sep 14 2005, 08:14 PM Wrote:Just to remind you OAC_Sparky it is 5hp peak and therefore you should not be using 110 V since this is the rms value.  You need to be using the peak voltage.  It would still require about 24A to achieve this 5hp peak, but just wanted to point this out since you did say it was your living.

As well I believe they do take into consideration what is called air watts, deals with the efficency of the fan or something like that.  Sorry vacuums are not my thing and never will be.
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RMS voltage is what you measure at the outlet. Peak voltage, for most practical applications, is a theoretical number that has no use.

RMS voltage is used because in actuality the voltage extension above the .707 point is so fractional compared to the rest of the sine wave that next to no extra work is performed, because an equal part of the wave (in the same cycle) is under the .707 .

When you use a meter to check your voltage at the outlet, if it's 110V the actual peak voltage is 155V, but the actual time above that .707 (ie.110V--->155V) is cancelled out by the time it's UNDER the .707 point (ie. 0--->110V) . That's why it is a "mean" ie average value.

When a motor is giving a peak rating, it means that in its duty cycle it can give a greater value than its normal operating output. ie. It can produce extra power for a short burst to start a high static load, for a short time before the windings overheat. But during that time, it still draws the current based on (746xHP)/RMS voltage.

There are no such recognized "air watts" or such nonsense like that (sorry, no offense, I'm sure you mean well). That's just more marketing hocuspocus.

Power in (watts)x efficiency (decimal percent) = Power out (watts)

You can't produce more power than you put in (no matter what you call it) because if we could we'd be using that technology to power everything. It would be one step better than a perpetual motion machine. Horsepower is horsepower. 1HP =746 Watts