Results 1 to 18 of 18

Thread: What size generator do I need

  1. #1
    Join Date
    Oct 2021
    Posts
    3
    Post Thanks / Like

    What size generator do I need

    I have a very old, but very large Lincoln welder, that requires 240. I don't at this time know exactly it's wattage requirements. I see conflicting information on the web regarding what size of generator I would need to run it. One says 9000 running watts is enough, another says I need at least 15,000. That's a big difference! Any other input would be great, thanks

  2. #2
    Join Date
    Mar 2021
    Location
    Near Roanoke, VA
    Posts
    530
    Post Thanks / Like

    Re: What size generator do I need

    The main thing that will determine generator size is how the welder will be used,,
    If you only TIG weld at 30 amps,, the watt requirement will be VERY low,, like only 3,000 watts,, or less,,
    100 amps of welding will mean the welder will draw much more wattage,, maybe 4,000 or 6,000 watts,,

    If you are gonna stick weld GIANT rods,, the size generator is going to grow,, a LOT!!

  3. #3
    Join Date
    Jun 2012
    Location
    CT
    Posts
    4,532
    Post Thanks / Like

    Re: What size generator do I need

    Quote Originally Posted by SweetMK View Post
    The main thing that will determine generator size is how the welder will be used,,
    If you only TIG weld at 30 amps,, the watt requirement will be VERY low,, like only 3,000 watts,, or less,,
    100 amps of welding will mean the welder will draw much more wattage,, maybe 4,000 or 6,000 watts,,

    If you are gonna stick weld GIANT rods,, the size generator is going to grow,, a LOT!!
    I have to disagree. Some Lincoln transformer machines are so inefficient that even at low amperage they require a rather large generator. https://www.lincolnelectric.com/en-z...ze-detail.aspx

    Keep in mind this is the guidance for their consumer grade machine that you can buy at Home Depot, not the 300+ pound Idealarc behemoths. It sounds like maybe the OP has one of the Idealarc machines. I have no idea what size generator is needed to run one of those, but I doubt it is going to be less than 10K watts.
    Miller Multimatic 255

  4. #4
    Join Date
    Mar 2018
    Location
    Clovis California
    Posts
    3,546
    Post Thanks / Like

    Re: What size generator do I need

    Need to know size of welder.?
    What plan to weld?
    Do you have a generator?
    Odds are the 9,000watt well work.

    Dave

    Quote Originally Posted by Galej View Post
    I have a very old, but very large Lincoln welder, that requires 240. I don't at this time know exactly it's wattage requirements. I see conflicting information on the web regarding what size of generator I would need to run it. One says 9000 running watts is enough, another says I need at least 15,000. That's a big difference! Any other input would be great, thanks

  5. #5
    Join Date
    Jun 2012
    Location
    CT
    Posts
    4,532
    Post Thanks / Like

    Re: What size generator do I need

    The quality of the generator is also going to play a role here. If you have a generator with a weak voltage regulation system that doesn't produce clean power (i.e., low total harmonic distortion), it is going to take a LOT more generator to run the welder. I had this problem with my well pump. My 13K Briggs generator with 20% THD could barely start my well pump. My 6.5K inverter generator starts it with no sweat.
    Miller Multimatic 255

  6. #6
    Join Date
    Mar 2021
    Location
    Near Roanoke, VA
    Posts
    530
    Post Thanks / Like

    Re: What size generator do I need

    Quote Originally Posted by Louie1961 View Post
    I have to disagree. Some Lincoln transformer machines are so inefficient that even at low amperage they require a rather large generator. https://www.lincolnelectric.com/en-z...ze-detail.aspx

    Keep in mind this is the guidance for their consumer grade machine that you can buy at Home Depot, not the 300+ pound Idealarc behemoths. It sounds like maybe the OP has one of the Idealarc machines. I have no idea what size generator is needed to run one of those, but I doubt it is going to be less than 10K watts.
    My friend borrowed a Miller Thunderbolt AC only machine that I had at the time,,
    He successfully welded a trailer with that welder,, using a 4,500 watt (surge) generator,, so, actual real life welding says a small generator will work.
    The little buzz box welders connected to 10HP gas engines will weld 1/8 inch rods,, I had one of those,, also,,
    A 10HP Kohler K engine can not produce 10K watts,, (maybe 4,500 watts??) and heck, that engine was hardly laboring when welding 1/8" rods,,,

    LOTS of people weld in their home on a 30 amp breaker, if using small rods,, bigger rods need a bigger breaker,,
    I have also done that with the Thunderbolt,,

  7. #7
    Join Date
    Sep 2016
    Location
    Detroit, Michigan
    Posts
    1,104
    Post Thanks / Like

    Re: What size generator do I need

    Quote Originally Posted by Galej View Post
    I have a very old, but very large Lincoln welder, that requires 240. I don't at this time know exactly it's wattage requirements. I see conflicting information on the web regarding what size of generator I would need to run it. One says 9000 running watts is enough, another says I need at least 15,000. That's a big difference! Any other input would be great, thanks
    Without knowing the model welder there really isn't any way we can help other than guess.
    Check out my bench vise website:
    http://mivise.com


    Miller Syncrowave 250DX
    Millermatic 350P with XR AlumaPro
    Miller Regency 200 with 22A feeder and Spoolmatic 3
    Hobart Champion Elite
    Everlast PowerTig 210EXT

  8. #8
    Join Date
    Dec 2007
    Location
    Los Angeles
    Posts
    8,325
    Post Thanks / Like

    Re: What size generator do I need

    Quote Originally Posted by SweetMK View Post
    My friend borrowed a Miller Thunderbolt AC only machine that I had at the time,,
    He successfully welded a trailer with that welder,, using a 4,500 watt (surge) generator,, so, actual real life welding says a small generator will work.
    The little buzz box welders connected to 10HP gas engines will weld 1/8 inch rods,, I had one of those,, also,,
    A 10HP Kohler K engine can not produce 10K watts,, (maybe 4,500 watts??) and heck, that engine was hardly laboring when welding 1/8" rods,,,

    LOTS of people weld in their home on a 30 amp breaker, if using small rods,, bigger rods need a bigger breaker,,
    I have also done that with the Thunderbolt,,
    Real world does matter.

    But the 30amp CB at home is backed up by the Power Plant generator

    generator power is a wee different due to the size - small- of the generator. They do not like big kicks to the nutz and some just do not recover from the initial surge in power to run a welder.

    The welding manufactures are stating the best size genset to use for optimal performance with their welder.
    Ed Conley
    http://www.screamingbroccoli.com/
    MM252
    MM211 (Sold)
    Passport Plus & Spool gun
    Lincoln SP135 Plus- (Gone to a good home)
    Klutch 120v Plasma cutter
    SO 2020 bender
    Beer in the fridge

  9. Likes Louie1961 liked this post
  10. #9
    Join Date
    Jan 2004
    Location
    Brethren, Mi
    Posts
    1,464
    Post Thanks / Like

    Re: What size generator do I need

    The gen on welding machines have way more poop than they list. But it would be cheaper to buy a import inverter that a cheap genset would run.

  11. #10
    Join Date
    Jan 2004
    Location
    Brethren, Mi
    Posts
    1,464
    Post Thanks / Like

    Re: What size generator do I need

    Not only that modern inverter will eeld from 120v. Lots more places you can weld but 1/8 6011 & 3/32 lo hy run toasty can do a lot of work and nothing easier than 2 pass 7018 with that small rod. Half nuke plant built with it.

  12. Likes MinnesotaDave liked this post
  13. #11
    Join Date
    Mar 2012
    Location
    Australia
    Posts
    809
    Post Thanks / Like

    Re: What size generator do I need

    Quote Originally Posted by Sberry View Post
    The gen on welding machines have way more poop than they list. But it would be cheaper to buy a import inverter that a cheap genset would run.
    Exactly this, generators get expensive real fast beyond about the 6000 watt range, I paid $1000 for a 9kva 7200 surge watt 5% THD generator, going up to a 11k watt triples the price, and above 13k watts you start looking at used engine drive welder price, where as a 4.5k watt generator will run a cheap 140 amp inverter and the welder and generator will be cheaper than a generator to run the old school welder you have.

  14. #12
    Join Date
    Jun 2012
    Location
    Sebeka and Bemidji MN
    Posts
    14,898
    Post Thanks / Like

    Re: What size generator do I need

    I plugged a miller dialarc 250/250 into my 8,000 watt generator (miller bobcat 225nt) and it would only run 3/32" 7018 at about 100 amps without popping the breaker.

    My inverter welders run on much lower watt generators.
    Dave J.

    Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~

    Syncro 350
    Invertec v250-s
    Thermal Arc 161 and 300
    MM210
    Dialarc
    Tried being normal once, didn't take....I think it was a Tuesday.

  15. Likes whtbaron liked this post
  16. #13
    Join Date
    Oct 2021
    Posts
    3
    Post Thanks / Like

    Re: What size generator do I need

    Thank you all so very much for your quick responses regarding my generator query. But I do owe you an apology! I finally got in to see the generator (it's in a neighbor's storage room) and it is not a Lincoln, but a Craftsman..! I'm guessing it's from the '60s, but was unable to find out online. Model number 113.20170
    The information on the front is as follows..
    A few of my numbers may be off due to difficulty reading
    PRimary:.
    Volt 230. Max 30 arc volts
    Rated amps 37. CYC (?). 60
    Phase 1 Max KW 7.2
    Max amps, short circuit 71
    SECondary
    Max amps 200. 30 arc volts, 30%, duty cycle
    Rate amp 160, 30 arc volts, 50% duty cycle
    Temp rise 90 c
    Max open circuit volts 80

    I plan to use either 6011, or 6013 rods for the vast majority of my work. Thank you thank you!

  17. #14
    Join Date
    Sep 2016
    Location
    Detroit, Michigan
    Posts
    1,104
    Post Thanks / Like

    Re: What size generator do I need

    Quote Originally Posted by Galej View Post
    Thank you all so very much for your quick responses regarding my generator query. But I do owe you an apology! I finally got in to see the generator (it's in a neighbor's storage room) and it is not a Lincoln, but a Craftsman..! I'm guessing it's from the '60s, but was unable to find out online. Model number 113.20170
    The information on the front is as follows..
    A few of my numbers may be off due to difficulty reading
    PRimary:.
    Volt 230. Max 30 arc volts
    Rated amps 37. CYC (?). 60
    Phase 1 Max KW 7.2
    Max amps, short circuit 71
    SECondary
    Max amps 200. 30 arc volts, 30%, duty cycle
    Rate amp 160, 30 arc volts, 50% duty cycle
    Temp rise 90 c
    Max open circuit volts 80

    I plan to use either 6011, or 6013 rods for the vast majority of my work. Thank you thank you!
    Those numbers all make sense. Did you notice anything about AC or DC output? I'm guessing it's an AC unit as there are several part numbers close to that which were AC only.

    Regardless, it's rated as pulling 37A when the output is 160A, but that's a bit more than you would need to run common 1/8" 6011 or 6013. The typical max for those two rods is around 125A, so it wouldn't be pulling 37A. At 37A you would need a generator that could handle a running load of 8,500W so you might be able to get by with something in the 7,000 range (running, not peak). The good thing is that you aren't likely to hurt the welder by not having enough power...it just won't weld properly. With some of the new machines I would be worried about a marginal generator or one that didn't put out really clean power.
    Check out my bench vise website:
    http://mivise.com


    Miller Syncrowave 250DX
    Millermatic 350P with XR AlumaPro
    Miller Regency 200 with 22A feeder and Spoolmatic 3
    Hobart Champion Elite
    Everlast PowerTig 210EXT

  18. #15
    Join Date
    Oct 2015
    Location
    NW New Jersey
    Posts
    945
    Post Thanks / Like

    Re: What size generator do I need

    SearsPartsDirect.com

    Model #11320170 Craftsman ac arc welder

    Name:  searsweld.jpg
Views: 110
Size:  12.7 KB

    No Parts seem to be available from Sear's anymore, maybe century tool, or century welding have a manual with some info.
    Airco 250 ac/dc Heliwelder Square wave
    Miller Synchrowave 180 sd
    Miller Econo Twin HF
    Lincoln 210 MP
    Dayton 225 ac/dc
    Victor torches
    Snap-On YA-212
    Lotos Cut60D

  19. #16
    Join Date
    Jul 2008
    Posts
    3,146
    Post Thanks / Like

    Re: What size generator do I need

    Most of my 1/8" 6010 I run at 72A, at least according to the DRO on my Sync250, though you really can't trust what's reported, I don't think.

  20. #17
    Join Date
    Dec 2013
    Location
    Mount Tabor VT
    Posts
    7,973
    Post Thanks / Like

    Re: What size generator do I need

    Have you said why you need a generator?

    37 amps X 240 volts says 9KW generator, but one should avoid loading a cheap generator to full rating.
    The picture looks to be a MIG or flux core machine.
    An optimist is usually wrong, and when the unexpected happens is unprepared. A pessimist is usually right, when wrong, is delighted, and well prepared.

  21. #18
    Join Date
    Sep 2016
    Location
    Detroit, Michigan
    Posts
    1,104
    Post Thanks / Like

    Re: What size generator do I need

    Quote Originally Posted by Willie B View Post
    The picture looks to be a MIG or flux core machine.
    Yeah, I suspect the Sears parts page doesn't always match the correct picture with vintage items...just a guess. It's definitely a more modern wire welder pictured.
    Check out my bench vise website:
    http://mivise.com


    Miller Syncrowave 250DX
    Millermatic 350P with XR AlumaPro
    Miller Regency 200 with 22A feeder and Spoolmatic 3
    Hobart Champion Elite
    Everlast PowerTig 210EXT

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Page generated in 1,638,545,217.26598 seconds with 14 queries