 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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| DonTraver |
May 13 2010, 10:43 AM
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Senior Member Group: Members Posts: 829 Joined: 5-August 04 Member No.: 2,461 |
Rule #1 with generators.
Calculate continuous load, multiply by 5, to get start up load, buy generator that matches or exceeds start up load. Small motors normally have start up capacitors to assist starting. Larger ones, not so much. Last generator plant I built and operated, 14.5mw at 4160 volts, 1680 amps. 6 3612 NG Caterpillar Generator Sets. With 6 Gensets online, when they started one of the 1500hp motors, it would dim the lights. Starting current was over 2000amps at 4160volts. For the extra power we ran in Parallel with the utility. If in doubt for stand alone operation, give yourself an extra 10% power. Good Luck, Don |
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| underthetire |
May 13 2010, 10:45 AM
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#3
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
QUOTE(DonTraver @ May 13 2010, 09:43 AM)  Rule #1 with generators. Caluculate continuous load, multiply by 5, to get start up load, buy generator that matches or exceeds start up load. Small motors normally have start up capacitors to assist starting. Larger ones, not so much. Last generator plant I built and operated, 14.5mw at 4160 volts, 1680 amps. 6 3612 NG Caterpillar Generator Sets. With 6 Gensets online, when they started one of the 1500hp motors, it would dim the lights. Starting current was over 2000amps at 4160volts. For the extra power we ran in Parallel with the utility. If in doubt for stand alone operation, give yourself an extra 10% power. Good Luck, Don Thats just scary power. The arc flash on that would instantly turn you in to a black powder on the ground ! |
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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 PRS914-6 Rand, it doesn't take a large generator to run... May 13 2010, 08:42 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 |
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