Tornador: compressor test

[onsite]

This requires a 20amp circuit

Curious as to why your stating this? Any input on it?


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[jwgreen6]

Curious as to why your stating this? Any input on it?


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Compressor motors have a substantial "initial surge current" requirement. Have you ever noticed your lights dimming when the refrigerator or freezer starts up? That's the initial surge current on display.

There are 1800 watts available on a 120/15A circuit, 2400 watts on a 120/20A. The initial motor startup could exceed this rating easily. That's why most compressors use a 240v motor; there is much more power available.

[onsite]

So would the 8k hf generator push it or rewire to run on 220 outlet?


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[onsite]

They have 28a breakers for what that's worth


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[onsite]

This one here http://m.harborfreight.com/8750-peak...arb-68525.html sorry 20A was mistaken


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[KB in MD]

Curious as to why your stating this? Any input on it?


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It was just a FYI.
i didn't read the fine print until after i purchased this unit. My garage only has a 15a circuit that trips when i try to use this compressor.

[onsite]

It was just a FYI.

i didn't read the fine print until after i purchased this unit. My garage only has a 15a circuit that trips when i try to use this compressor.

Oh the 29 gal? I picked it up cheap for my trailer but now I'm scared I won't find a gen to power it. I'm looking at the 8750 harbor freight one but hate to spend the money to find it still won't do the job rather than get rid of this one for something smaller!


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[jwgreen6]

It was just a FYI.
i didn't read the fine print until after i purchased this unit. My garage only has a 15a circuit that trips when i try to use this compressor.

The inrush surge current can be up to 100x the "steady-state" current rating meaning the motor can try to initially draw 150A for 1/2 cycle, thus tripping the breaker. One thing that can help tame this effect is an "Inrush current limiter", a combination of power resistors, thyristors, and triacs. An electrical engineer could design such a device for your application.

Generators have a hard time handling ISC because the power is being consumed as it is needed. A typical home that is wired with 240V/200A service has a "pool" of 48KW to draw from coming into the house. A generator cannot make up the ISC because its "pool" is much smaller. So you have to increase the capacity of the generator substantially to keep it from tripping its overload protection.

[KB in MD]

another old thread:

http://www.autogeekonline.net/forum/...dor-users.html

[KB in MD]

It was just a FYI.
i didn't read the fine print until after i purchased this unit. My garage only has a 15a circuit that trips when i try to use this compressor.

I worded incorrectly. It trips the overload circuit on the compressor not the house 15a breaker