[Homeroast] Variac question

Dennis Guyer adg22 at sbcglobal.net
Thu Aug 25 12:39:33 CDT 2011


Hi Dean,

I think you have giving me the answer I was looking for.  I really didn't 
want to spend $150 on an additional piece of equipment.  If it won't make 
all that much difference, I'll just do with the voltage I am dealt.



Thanks for the explanation,



Dennis G


----- Original Message ----- 
From: "Dean" <dean_schaffran at wildblue.net>
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>
Sent: Saturday, August 20, 2011 6:58 PM
Subject: Re: [Homeroast] Variac question


> Dennis,
>
> Last question first: it will likely make little or no difference--you're 
> only seeing a 2% under "nominal" no-load and another 3% sag under load. 
> (old school said 110-120 was normal voltage at the outlet in USA)
>
> With a 15(20) min roast 5% is 45(60) sec and that's the "range of normal" 
> that I find with my Behmor. (Though it's a great rig for a 400g roaster, 
> the cycles show a fair degree of variation, and even with all the settings 
> it's hard to control well--I had better control with my Rosto, but much 
> smaller batches)
>
> As far as sizing I respectfully disagree with MMc: per the website for 
> superior electric, the ratings are continuous duty.  If you allow some 
> time to cool down you can exceed the rating for a while.  Search the 
> archive for something that I discussed with miKe mcCoffee a few years ago. 
> I think that a 1000w unit would be adequate for batch use, but check the 
> duty cycle first...
>
> Dean
> Havin a martini in da weeds......
>
> On 8/20/2011 6:49 PM, Michael Mccandless wrote:
>> The key is uniformity.
>> Line V can change @ different times of day.
>> Variac rating should exceed the device rating.
>>
>> MMc
>>
>>
>> On Sat, Aug 20, 2011 at 3:52 PM, Dennis Guyer<adg22 at sbcglobal.net> 
>> wrote:
>>
>>> My normal line voltage is 117.5.  I am wondering if using a Variac would 
>>> be
>>> of help.  The only one I have found in my price range is at Fry's and it
>>> will handle 1000 watts.  I see the Behmor is rated at 1650 watts.  If 
>>> this
>>> will not handle the power, what are others using?  When I am roasting my
>>> line voltage drops to around 114 to 114.5 most of the time.  On some 
>>> good
>>> days it will hit 15 to 15.5.  Any suggestions?  Is it worth it to use 
>>> the
>>> Variac or will it make little difference?
>>>
>>> Thanks for any input,
>>>
>>> Dennis G
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