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Testing home voltage for roaster. Kill A Watt shows 155v ???
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SmkSignals
Senior Member


Joined: 18 Feb 2013
Posts: 14
Location: SoCal
Expertise: Just starting

Posted Sat May 4, 2013, 5:29pm
Subject: Testing home voltage for roaster. Kill A Watt shows 155v ???
 

Hi Everyone. I have a new to me Behmor 1600 and love it. Roasts great and have no problems with the roaster.

I was curious about the voltage at the outlet I am using in the garage. I bought the lesser expensive Kill A Watt P4400. From what I read this model shows voltage instantly.  It is reading 155v before plugging in the Behmor. It reads the same after plugging in the Behmor and roasting on the P1 setting. While full into the roast it also reads 1720 watts. When I start the cool cycle the watts drop to 75 (no heating element on).

I plugged it in multiple outlets and they all read 155-156 volts. The same outlet with a 50' extension cord still reads 155v. when plugged in at the end of the cord.

I looked at my breaker box and I have nine 20a breakers and two 15a breakers. Labels are pretty worn off. Being the plugs I am testing with are in the garage (next to washer and dryer hookups) and in the kitchen I assume these are 20 amp circuits?

I have a circuit tester and the lights on the tester show the circuit is correct.

My question is  -

Can I really 155 volts?
Shouldn't the voltage drop when the Behmor's heaters fire up?
If I do have 155v, is this dangerous?

Or is my Kill A Watt bunk?

I appreciate the help.

- Kurt T.
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slybarman
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slybarman
Joined: 3 Nov 2011
Posts: 366
Location: usa
Expertise: I love coffee

Espresso: La Nuova Era Cuadra
Grinder: Baratza Vario
Posted Sat May 4, 2013, 5:51pm
Subject: Re: Testing home voltage for roaster. Kill A Watt shows 155v ???
 

SmkSignals Said:

Hi Everyone. I have a new to me Behmor 1600 and love it. Roasts great and have no problems with the roaster.

I was curious about the voltage at the outlet I am using in the garage. I bought the lesser expensive Kill A Watt P4400. From what I read this model shows voltage instantly.  It is reading 155v before plugging in the Behmor. It reads the same after plugging in the Behmor and roasting on the P1 setting. While full into the roast it also reads 1720 watts. When I start the cool cycle the watts drop to 75 (no heating element on).

I plugged it in multiple outlets and they all read 155-156 volts. The same outlet with a 50' extension cord still reads 155v. when plugged in at the end of the cord.

I looked at my breaker box and I have nine 20a breakers and two 15a breakers. Labels are pretty worn off. Being the plugs I am testing with are in the garage (next to washer and dryer hookups) and in the kitchen I assume these are 20 amp circuits?

I have a circuit tester and the lights on the tester show the circuit is correct.

My question is  -

Can I really 155 volts?
Shouldn't the voltage drop when the Behmor's heaters fire up?
If I do have 155v, is this dangerous?

Or is my Kill A Watt bunk?

I appreciate the help.

- Kurt T.

Posted May 4, 2013 link

Electric appliances or motors (whatever) pull amps, not volts. The voltage stays constant and amps go up as the appliance draws power. Amps x volts = watts.
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JKalpin
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JKalpin
Joined: 28 Dec 2008
Posts: 785
Location: Thornhill, Ontario Canada
Expertise: I love coffee

Espresso: Aerobie Aeropress
Grinder: Baratza Maestro Plus
Vac Pot: Yama 5-Cup
Drip: Krups Moka Brew, BraZen
Roaster: Freshroast+8, Behmor 1600
Posted Sat May 4, 2013, 7:12pm
Subject: Re: Testing home voltage for roaster. Kill A Watt shows 155v ???
 

When you first plug in the Kill-A-Watt Meter it usually defaults to a voltage reading.

If you had 155V on your incoming line you would be popping light-bulbs and burning out most other 120V appliances.  My guess is that you have a bad meter.

 
Jerry
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SmkSignals
Senior Member


Joined: 18 Feb 2013
Posts: 14
Location: SoCal
Expertise: Just starting

Posted Sat May 4, 2013, 9:44pm
Subject: Re: Testing home voltage for roaster. Kill A Watt shows 155v ???
 

Thanks Jerry. Meter was bad. I went to a friends house and it showed 155v there also. I exchanged the faulty one and bought the EZ version. Line voltage started @ 119 volts. Drops to 112.9 during height of the roast.
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Prof
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Prof
Joined: 10 Sep 2004
Posts: 670
Location: Seattle
Expertise: Pro Roaster

Espresso: PV Lusso
Grinder: Pharos 696, Zass
Drip: Aeropress, Brazen
Roaster: Behmor, TO/SC, Poppery I
Posted Sat May 4, 2013, 11:29pm
Subject: Re: Testing home voltage for roaster. Kill A Watt shows 155v ???
 

I am now using a Ensupra electric monitor, and the Kill-A-Watt will have duties elsewhere.  The Ensupra has more information on the screen, has a reset button, and show WattHours with more precision.  I use it for roasting and for checking my e-bike's battery usage over miles ridden.

 
LMWDP # 010
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Endo
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Endo
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Posted Sun May 5, 2013, 9:28am
Subject: Re: Testing home voltage for roaster. Kill A Watt shows 155v ???
 

slybarman Said:

Electric appliances or motors (whatever) pull amps, not volts. The voltage stays constant and amps go up as the appliance draws power. Amps x volts = watts.

Posted May 4, 2013 link

Actually no. Since some roasters use phase power control.

Amps x Volts = VA

Amps x Volts  x PF = Watts

You have both readings on the kill-a-watt.
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slybarman
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slybarman
Joined: 3 Nov 2011
Posts: 366
Location: usa
Expertise: I love coffee

Espresso: La Nuova Era Cuadra
Grinder: Baratza Vario
Posted Sun May 5, 2013, 10:24am
Subject: Re: Testing home voltage for roaster. Kill A Watt shows 155v ???
 

That's what I get for assuming AC and DC were essentially the same.
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Netphilosopher
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Joined: 14 Jan 2011
Posts: 1,602
Location: USA
Expertise: Just starting

Posted Tue May 7, 2013, 4:14am
Subject: .
 

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