Posted Sun Oct 16, 2011, 8:08am Subject: How to prevent voltage drop with Behmor without using a Variac
Being new to home roasting and the Behmor, I am looking for a few recomendations on how to prevent voltage drop with out the use of a Variac. My house has a 200 amp service and although I'm not a electrition I am comfortable running a new dedicated line just for my Behmor.The reason I chose the Behmor is so I can roast a pound of coffee at a time but apon further research I have seen alot of post where peeps have to reduce their charge to get to 2c. I see alot of peeps recomending a Variac, but if using a dedicated line would stop or reduce the voltage drop I would prefer to do this. My line run to my roasting station would be less than 10 ft. from my fuse box.I have 3 days untill my Behmor arrives so I am trying to get prepared for my new adventure.
Posted Sun Oct 16, 2011, 9:09am Subject: Re: How to prevent voltage drop with Behmor without using a Variac
I have a Behmor with over 400 roast to date and I do not use a Variac or have a dedicated line to roast on. I do roast in the garage which is on a seperate breaker and I also have a 200 amp service. I have been able to maintain consistent roast by not running anything in the house that uses a 220 line to power it. AC, Dryer, Stove/Oven. As long as these are off for the 10-20 minutes the roasting is in process I do not not have any major power fluctuation problems. And the basic 110 lights and TV in the house do not effect my roast times. I roast by sound and smell so unless you are one that will be charting your roast on a computer program trying to achieve absolutely identical times. I don't feel a variac is needed. My roast times are usally within 10 seconds of each other which may vary due to the actual air temp of each roast as I use the open door method for 15 sec. to extend 1c times. Getting to 2C with 1 pound roast is no problem using P1. My coffee roast levels are very consistent and the coffee always gets compliments from family and friends. Good luck with your new Behmor.
Posted Sun Oct 16, 2011, 1:22pm Subject: Re: How to prevent voltage drop with Behmor without using a Variac
TY,Thanks for the help I'll mainly be roasting for espresso blends or so's for espresso (northern Italian) a few secs in to 2c so I would like to experiment with p2 also until I get a system down. The main thing is being able to do 1pnd at a time, is this possible for you with the other profiles p2,p3 ect or is that why you prefer to use p1 and crack door to ajust profile. I have 20 pds of various greens to practice with but would hate to bake or under roast any. Right now I go thru about 7 pnds in 2 weeks so I guess I'll have to sep up to the learning curve quick.
Posted Mon Oct 17, 2011, 6:32pm Subject: Re: How to prevent voltage drop with Behmor without using a Variac
ok I've decided to run a dedicated line but not sure on the breaker (I'm no electrition) should I use a 15a or a 20a breaker.I'd like to have a 20a line to my roasting station for future use but not sure if the 15a behmor will be ok on it. so far I bought a 15a and a 20a breaker? 25ft of 10/2 type NM-B romex cable (went with heavier cable to help with voltage drop) and a 20a spec grade duplex outlet,and a kill-a-watt ez ( not sure if any diff from reg kill-a-watt). Hopefully I can get it all together by tomorrow.
The two quartz tube/nichrome wire heaters are 525 watts each. The afterburner is 500 watts going by memory. The times that the afterburner is on also is 525+525+500 watts = 1,550 watts.
It depends on your supply line voltage, & in the summertime with all the draw down on the local power grid of neighbourhood A/C running (ours off when I measured) was 116 volts. Currently I have 118 volts.
I= P divided by E so 1st senario voltage, the max current would be 13.36 amps, 2nd voltage the max current would be 13.14 amperes. This/my house was built in 1956 & has standard 15 amp branch circuits & my Behmor works just fine. I haven't looked or measured the 2 WIRE ONLY cable wires but I'm sure it's only 14 gauge wire max & only 100 amp service.
I did do some measurements a few months ago with my DVM & there's a noticable voltage drop when the elements turn on, & also the afterburner. My Behmor is roasting fine within its design parameters & my standard roast is 12 oz/340 grams.
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