[Homeroast] Variac question
dean_schaffran at wildblue.net
Sat Aug 20 20:58:28 CDT 2011
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...
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.
> 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
>> Homeroast mailing list
>> Homeroast at lists.sweetmariascoffee.com
>> Homeroast community pictures -upload yours!) :
> Homeroast mailing list
> Homeroast at lists.sweetmariascoffee.com
> Homeroast community pictures -upload yours!) : http://www.sweetmariascoffee.com/gallery/main.php?g2_itemId=7820
More information about the Homeroast