[Homeroast] Quest Amp Question

Rich rich-mail at octoxol.com
Fri Feb 4 19:44:14 CST 2011


Considering the heating element as a pure resistance and no reactive 
component then P = EI.  If the voltage at the heater is 125v while the 
current is 10a then the power is 1250 watts.

On 02/04/2011 06:34 PM, sci wrote:
> Further question:
>
> If my line voltage is 125v and I turn my Quest to 10A, doesn't that mean I
> am drawing 1250 watts? (don't have a Killowatt)
> If so, am I not hurting the unit because it is rated at 1050 watts? I don't
> want to burn out the elements.
>
> Just for reference, my Quest will draw only 10.5A empty and cold. I run it
> on a 20A (125v measured line voltage) circuit with nothing else running on
> that circuit.
>
> Also, I have been doing what Tom does. I set the amperage at a constant
> based on the batch size. I typically do a 200g batch with a 7.5A setting
> (charge at 200C). However, I have insulated the drum which seems to give the
> whole unit a little extra ooomph! (that's a technical word that only
> electrical engineers with Ph.D.s use :-)
>
> Ivan
>
> ___________________________________________
> From: Barry Luterman<lutermanb at gmail.com>
> To: "A list to discuss home coffee roasting. There are rules for this
>         list,   available at http://www.sweetmarias.com/maillistinfo.html"
>         <homeroast at lists.sweetmariascoffee.com>
> Subject: Re: [Homeroast] Quest Amp Question
> Message-ID:
>         <AANLkTimOuBnkEQuh8C7KfpK7N4y-OQTwXeW4fv-MVvPe at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> This afternoon roasts were better. I went back to my origional tools. My
> nose and ears. I was trying to be too scientific relying on meters and
> guages. It suddenly dawned on me the reason for the meters and guages are to
> quantify the art of roasting and replicate a roast. First however, you have
> to roast correctly. Now I think I am finally on the right track. This is not
> a roaster for a beginner and I was approaching it like a beginner.
>
> On Thu, Feb 3, 2011 at 2:43 PM, Tom&  Maria - Sweet Maria's Coffee<
> sweetmarias at sweetmarias.com>  wrote:
>
>> Just a comment: I tend to use about 7.5 amp setting, then use the air
> speed
>> to shape the roast. I make adjustments to the amps on the fly and
> especially
>> alter it for batch size, but I find that once the coffee is warm, higher
> air
>> speed will accelerate the roast and lower will slow it down - I see it as
> my
>> fine-tuning control. I use 125 grams on average... Of course, there are
> many
>> ways of approaching the roast, and since it is quite a manual machine, it
>> allows you to do whatever you like! Even with extreme settings I have
> found
>> it hard to scorch coffee in a Quest, although I am sure it could be done.
>>
>>
>> Thank You all very much. Back to tweaking my profiles. Glad my house is
>>> wired correctly and my Quest is working correctly. A poor mechanic always
>>> blames his tools first.Now to relearn the craft of roasting.
>>>
>>> On Thu, Feb 3, 2011 at 1:26 PM, Rich<rich-mail at octoxol.com>  wrote:
>>>
>>>   The current available is not determined by the circuit breaker rating.
>>>> The
>>>>   max available is determined by the circuit breaker rating though. The
>>>>   current is determined by the applied voltage and the resistance that
> the
>>>>   voltage is applied to.  E=IR
>>>>
>>>>
>>>>   On 02/03/2011 03:00 PM, Barry Luterman wrote:
>>>>
>>>>   I have been having difficulty nailing a roast with my new Quest. Today
> I
>>>>>   plugged it in empty turned it on opened the amp switch all the way
>   and
>>>>>   the
>>>>>   meter went only to 11. This has me wondering if I am not getting
> enough
>>>>>   Amperage out of the socket. They are supposed to be 20 amp circuits in
>>>>> the
>>>>>   house. Do the other Quests behave the same?
>>>>>   _______________________________________________
>>>>>   Homeroast mailing list
>>>>>   Homeroast at lists.sweetmariascoffee.com
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