 Generators and power requirements |
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| Rand |
 May 13 2010, 08:19 AM
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Cross Member  Group: Members Posts: 7,411 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None  |
Want to run power tools and a light-duty welder - just a 110-powered flux-core. I know there's math to calculate power requirements, but there are also variables about how long you can run it continuously and all that. So I thought I'd see if those with experience would chime in.
I don't need heavy duty. But I don't want to be worried about when I have to stop and let things cool down. Just for argument's sake, let's use Harbor Freight as an example... Say you have this 90-amp welder: http://www.harborfreight.com/90-amp-flux-w...lder-98871.html Out of these generators, which could and could not handle it? http://www.harborfreight.com/engines-gener...generators.html |
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| PRS914-6 |
May 13 2010, 08:42 AM
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Excellence Magazine Project 914 3.6 Group: Retired Members Posts: 1,278 Joined: 20-May 06 From: Central California Member No.: 6,031 Region Association: None  |
Rand, it doesn't take a large generator to run those sexual aid products...get a battery operated one! (IMG:style_emoticons/default/sawzall-smiley.gif)
On the serious side....I'm not an electrician but what I have learned from first hand experience (that would be failures) is that when motor operated devices are used, it takes a larger generator to start them because of the amp\voltage spike at startup. Once they are running, then it doesn't take much to keep them running, it's just that startup load that hurts you. It seems the larger the motor the more critical to go oversize to compensate. If you put an amp meter on a motor when it started it would momentarily peg the meter and that's what the generator has to overcome. Plug a grinder into a small welder and see the delay when you pull the trigger. Plug the same welder in the wall and see how fast it takes off. One time I tried to run my well motor and borrowed a large generator. It wouldn't start the motor but would allow continuous running once started. A welder uses a big draw when you start a weld. It has to fire off the spool feed motor, open solenoids and start an arc all at the same time. Go oversize for sure. Look at "peak" power vs. continuous power. Some advertise "peak" I chose the largest anticipated draw and double it. More with large motors. Hopefully others with more info will chime in..... YMMV...see ya at South Shore! |
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Posts in this topic
Rand Generators and power requirements May 13 2010, 08:19 AM
jmill 120 volts x 15 amps = 1800 watts. Those 7000 watt... May 13 2010, 08:23 AM Rand If it's that simple then the 2200 watt generat... May 13 2010, 08:32 AM Rand So the grinder is going to be a tougher client tha... May 13 2010, 08:52 AM
PRS914-6
So the grinder is going to be a tougher client th... May 13 2010, 09:26 AM
Spoke
So the grinder is going to be a tougher client th... May 13 2010, 10:37 AM underthetire I can tell you first hand that the 90 amp HF flux ... May 13 2010, 09:19 AM DonTraver Rule #1 with generators.
Calculate continuous loa... May 13 2010, 10:43 AM underthetire
Rule #1 with generators.
Caluculate continuous l... May 13 2010, 10:45 AM |
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