Results 1 to 22 of 22
Like Tree9Likes
  • 2 Post By fg1972
  • 1 Post By deegee
  • 1 Post By Divey
  • 1 Post By dan110024
  • 3 Post By deegee
  • 1 Post By deegee

Thread: Behmor and extension cord

  1. #1
    Senior Member paulau's Avatar
    Join Date
    Jul 2007
    Posts
    114

    Behmor and extension cord

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi,

    I just picked up a new Behmor roaster and noticed the tag on the cord that says not to use an extension cord. I was wondering if there was an issue with this in Australia, or whether this pertained to North America? The manual appears to be a modified version of the US one and I know that extension cords have more of an impact on their 110v system.

    I only want to run a 1 metre extension cord.

    Thanks for any advice.

    Cheers

  2. #2
    Member
    Join Date
    Jan 2012
    Posts
    85
    Hello Paulau, I don't think you should be too concerned about an extension lead. In the US they run on 110 - 115 volts, and sometimes the local supply can be a bit lower still. This means that for the same wattage they are drawing more than twice as much current as we would here in Oz. It is this high current which increases the voltage drop in the lead, and reduced power at the appliance. The loss is also proportional to the length of the lead, so the shorter it is, the less effect it will have. One meter would have virtually no effect at all.

    For the same reason, using an extension lead to slow down popper roasts is not very effective unless you use a VERY long lead with small diameter conductors.

    Cheers, Leo.

  3. #3
    Junior Member
    Join Date
    Sep 2010
    Posts
    1
    Hi Paulau!
    Most of the time manufacturers have in mind a "long" extention cord. If you used the roaster on a 25m cord, there will be a big power loss in the cord, the power available at the end of those 25m could be insuficient to safely run the appliance and may damage electric components (and void the warranty). No risks with a 1 or 2m cord all safe...

  4. #4
    Senior Member Divey's Avatar
    Join Date
    Oct 2011
    Posts
    132
    I have monitored my power voltage supply continually since I purchased my Behmor and the results are amazing. The maximum power encountered was 254.6 volts and the lowest has been 249 volts. I would say that the average would be around the 252 volt mark as I have not actually recorded my findings.

    With this in mind, I contacted Behmor and asked if using an extension chord could possibly be beneficial in my case as the time I was experiencing between 1st crack and 2nd crack was almost zero and 1st crack seemed to roll on straight into 2nd crack. Joe Behm said that my enquiry was a first for him and after some consideration, seemed to think using an extension chord could be beneficial. He told me that quite often they are forced to use extension chords at trade shows and he has not experienced too many problems.

    I tried this on my very last roast, and, I would say that it slowed the time between 1st crack and 2nd crack considerably. And it was by far my best roast in the Behmor. I used 300grams, 1lb, P2 and cooled at the very first sounds of 2nd crack. From memory there was about 6 minutes to go when I hit cool.

  5. #5
    Junior Member
    Join Date
    Oct 2009
    Posts
    14

    Behmor and extension cord

    I definitely found that using an extension lead was a problem. Even extending roasting times to the maximum, all of my roasts were under-done.
    Never fear. I found a simple solution. The Behmor has several voltage settings. I simply changed the voltage setting from 240v to 230v. Now roasting times are pretty well spot on!
    Good luck with your setup.

  6. #6
    Junior Member
    Join Date
    Oct 2009
    Posts
    14

    Behmor and extension cord

    Forgot to say, I was using a good quality heavy duty 10m lead. I measured the voltage as only dropping 1v across the lead, but I still had problems with roasting times.

  7. #7
    Senior Member deegee's Avatar
    Join Date
    Sep 2012
    Location
    Brisbane Southside
    Posts
    348

    Re Extension Lead

    Quote Originally Posted by njkeng View Post
    Forgot to say, I was using a good quality heavy duty 10m lead. I measured the voltage as only dropping 1v across the lead, but I still had problems with roasting times.
    If you were only dropping one volt in the lead, it seems unlikely that it was causing the problem.

    Was that measured under load or no-load ??

  8. #8
    Senior Member Divey's Avatar
    Join Date
    Oct 2011
    Posts
    132
    Quote Originally Posted by deegee View Post
    If you were only dropping one volt in the lead, it seems unlikely that it was causing the problem.

    Was that measured under load or no-load ??
    How do you measure the voltage under a load.

    I have measured the voltage at the end of the chord and it's the same as the power point, however, I'm assuming that when the machine is operating some power would be lost within the chord.

    Am I on the right track or not. I want less power not more.

  9. #9
    Senior Member deegee's Avatar
    Join Date
    Sep 2012
    Location
    Brisbane Southside
    Posts
    348
    Quote Originally Posted by Divey View Post
    How do you measure the voltage under a load. Am I on the right track or not. I want less power not more.
    You measure the voltage while the machine is running. And with a roaster it would need to be while the heater element was on full or high. Under no-load there will be very little voltage drop, but it will be higher under load with current flowing. How much higher depends on how much current, and the quality of the lead.

    I don't believe that extension cords have much effect in Australia compared to the USA, but the Behmor does seem to be rather sensitive to line voltage, so it is possible that it may make more difference to it than it would to something like a popper.

    So you are on the right track, and it could be that it will make some difference. However, if the Behmor has multiple voltage settings as mentioned above, and if you can set it to a higher voltage than it is at present, this would probably have more effect than any extension cord would.

  10. #10
    Coffee Nut fg1972's Avatar
    Join Date
    Jan 2012
    Location
    Melbourne
    Posts
    452
    Without getting too technical, you could check it under load by plugging in the machine to a double GPO wall power outlet.
    Connect your measuring probes into 1 outlet and plug the machine the other outlet and turn it on.
    Take note of the voltage with no load, (machine off ) then under load with the machine on.

    Then compare it to using an extension lead.

    Place a double adapter at the end of the extension lead. Connect your measuring probes into 1 outlet on the double adapter and plug the machine into the other outlet on the double adapter.
    Take note of the voltage with no load, (machine off ) then under load with the machine on.

    Hope this helps
    GreenBeanGenii and deegee like this.

  11. #11
    Senior Member Divey's Avatar
    Join Date
    Oct 2011
    Posts
    132
    Quote Originally Posted by fg1972 View Post
    Without getting too technical, you could check it under load by plugging in the machine to a double GPO wall power outlet.
    Connect your measuring probes into 1 outlet and plug the machine the other outlet and turn it on.
    Take note of the voltage with no load, (machine off ) then under load with the machine on.

    Then compare it to using an extension lead.

    Place a double adapter at the end of the extension lead. Connect your measuring probes into 1 outlet on the double adapter and plug the machine into the other outlet on the double adapter.
    Take note of the voltage with no load, (machine off ) then under load with the machine on.

    Hope this helps
    That's a bloody good idea.

    *Divey rummaging through everything looking for a double adapter.

  12. #12
    Senior Member deegee's Avatar
    Join Date
    Sep 2012
    Location
    Brisbane Southside
    Posts
    348
    Hey FG you must be a mind reader.

    After I posted I was thinking that I should have mentioned a "how-to" with a double adapter, but you really nailed it for me. Very clear & concise.
    GreenBeanGenii likes this.

  13. #13
    Senior Member Divey's Avatar
    Join Date
    Oct 2011
    Posts
    132
    Very pleased with 'the little experiment'.

    253.6 V measured at a double power outlet.
    252.2 V at the end of the extension chord.
    247.9 V at the double adapter whilst the Behmor was running.

    I'm pretty pleased with that. A drop of 5.7 volts should be enough to assist me.

  14. #14
    Senior Member shapeshifter's Avatar
    Join Date
    Oct 2010
    Location
    Newcastle
    Posts
    726
    Divey I don't normally run mine with an extension cord but we did do the same experiment, we have 249 volt at the power point and with the Behmor running using a 3 metre extension cord there was only a drop of 1 volt.

  15. #15
    Senior Member Philby1981's Avatar
    Join Date
    Jun 2009
    Posts
    155
    Quote Originally Posted by njkeng View Post
    I definitely found that using an extension lead was a problem. Even extending roasting times to the maximum, all of my roasts were under-done.
    Never fear. I found a simple solution. The Behmor has several voltage settings. I simply changed the voltage setting from 240v to 230v. Now roasting times are pretty well spot on!
    Good luck with your setup.
    Hi njkeng, so setting the roaster to 230v helped? I have sometimes been having trouble getting to 2nd crack on 400g roast due to colder weather here. Does setting it to 230v give it more oomph? Also could let me put 450g to roast maybe?
    Or anyone else tried this? Have been scouring behmor posts for this.
    Cheers

  16. #16
    Senior Member Divey's Avatar
    Join Date
    Oct 2011
    Posts
    132
    It has taken quite awhile. Complain and sometimes you get results. I'm happy now and the roasting in the Behmor is much easier for me.

    GreenBeanGenii likes this.

  17. #17
    Senior Member
    Join Date
    Aug 2013
    Location
    Adelaide, South Australia, Australia
    Posts
    208
    just re-igniting an old thread.

    How much does the voltage drop off effect the behmor?

  18. #18
    Senior Member Bosco_Lever's Avatar
    Join Date
    May 2009
    Location
    QLD
    Posts
    442
    Quote Originally Posted by ggoosen View Post

    How much does the voltage drop off effect the behmor?
    The behmor is a pretty robust and resilient creature.
    It can handle the "voltage drop off" with ease.....

  19. #19
    Member dan110024's Avatar
    Join Date
    Dec 2014
    Location
    Adelaide, Australia
    Posts
    76
    You would be able to work out the actual power by multiplying the voltage by the current that it's drawing. This gives you the wattage. Compare the results of cord/no cord and work out the power drop in a percentage, and therefore gauging how much of a difference it would make.
    ggoosen likes this.

  20. #20
    Senior Member deegee's Avatar
    Join Date
    Sep 2012
    Location
    Brisbane Southside
    Posts
    348
    Quote Originally Posted by ggoosen View Post
    just re-igniting an old thread. How much does the voltage drop off effect the behmor?
    Here in Australia - not much - in fact hardly any. Here is a quote from some arithmetic I did a while back in regard to poppers :-

    Myth-buster :- In Australia where we run on 230/240 volts, extension leads will NOT drop enough voltage to make a difference, unless they are faulty, or very light-duty leads 100+ meters long. A typical extension cord (with 2.5 mm conductors) causes a voltage drop of 25mV per amp of current, per meter of length.
    A 1200 watt popper will draw 5 amps, which = 0.125 volts per meter or just 1.25 volts drop for every 10 meters of extension lead.

    If you increase that by 33% it will be about right for a 1600 watt roaster. Still less than typical voltage variations during the day as demand fluctuates.

    This is not entirely an urban myth. It started in the USA where they run on 110 / 120 volts, which more than doubles the drop. Even so it should not have caused too much trouble, but in some areas the supply grid was sometimes overloaded so the actual voltage available at the power point was even lower. When this happened, an extension lead was the proverbial last straw, that broke the camel's back.
    Dimal, GreenBeanGenii and ggoosen like this.

  21. #21
    Senior Member
    Join Date
    Aug 2013
    Location
    Adelaide, South Australia, Australia
    Posts
    208
    Quote Originally Posted by deegee View Post
    Here in Australia - not much - in fact hardly any. Here is a quote from some arithmetic I did a while back in regard to poppers :-

    Myth-buster :- In Australia where we run on 230/240 volts, extension leads will NOT drop enough voltage to make a difference, unless they are faulty, or very light-duty leads 100+ meters long. A typical extension cord (with 2.5 mm conductors) causes a voltage drop of 25mV per amp of current, per meter of length.
    A 1200 watt popper will draw 5 amps, which = 0.125 volts per meter or just 1.25 volts drop for every 10 meters of extension lead.

    If you increase that by 33% it will be about right for a 1600 watt roaster. Still less than typical voltage variations during the day as demand fluctuates.

    This is not entirely an urban myth. It started in the USA where they run on 110 / 120 volts, which more than doubles the drop. Even so it should not have caused too much trouble, but in some areas the supply grid was sometimes overloaded so the actual voltage available at the power point was even lower. When this happened, an extension lead was the proverbial last straw, that broke the camel's back.
    @Deegee you legend! Thanks for taking to the time to explain this out.

    With that said, you mentioned "normal during the day fluctuations" .

    Do you reckon its worth while using a DMM or wall plug meter to check before roasting. I mean, potentially if you were trying to roast during peak load you may have a significant enough voltage drop to warrant a difference in applied heat?

  22. #22
    Senior Member deegee's Avatar
    Join Date
    Sep 2012
    Location
    Brisbane Southside
    Posts
    348
    Behmor Coffee Roaster
    Quote Originally Posted by ggoosen View Post
    @Deegee you legend! Thanks for taking to the time to explain this out. With that said, you mentioned "normal during the day fluctuations" . Do you reckon its worth while using a DMM or wall plug meter to check before roasting. I mean, potentially if you were trying to roast during peak load you may have a significant enough voltage drop to warrant a difference in applied heat?
    My apologies for the late reply, I have not been online much the last few days, and didn't see your post til just now.

    The truth is I don't know for sure, but wouldn't be inclined to worry about it - unless you get much bigger fluctuations than I do.
    Where I live the voltage varies from 235 to 245 depending in the weather and time of day, but those are the extremes - it's usually less.
    That's about a 2% max swing above/below nominal and I doubt that it would make much difference in practice.
    However I don't have a Behmor (yet) so I can't be absolutely sure on this.

    My fairly heavily modified poppers have digital voltmeters, and SCR's which I use to gradually increase the voltage to the heater coils .
    I usually get to the maximum available voltage toward the end of a roast, and it may take 30 seconds more or less if the mains voltage is high or low, but my roast times vary more than that with the ambient temperature at the time / on the day.
    How this equates to your Behmor, I really don't know, but if you already have the gear, it could be interesting to note what the voltage is during your roasts, and see whether you can detect any differences in roasts done at different voltages.

    cheers, deegee
    Dimal likes this.



Similar Threads

  1. Steam Tip Extension
    By blackbean in forum Brewing Equipment (non-machine specific)
    Replies: 1
    Last Post: 12th October 2009, 01:31 PM
  2. Replies: 5
    Last Post: 2nd September 2009, 05:25 PM
  3. Spout extension for Sunbeam 0480 grinder
    By gronk62 in forum Grinders
    Replies: 49
    Last Post: 15th October 2008, 02:24 PM
  4. Popper with long extension cord
    By niallpedlow in forum Home Roasting - Tips, Tricks, Ideas
    Replies: 9
    Last Post: 19th January 2007, 03:57 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •