Welding off a genny

[jimbo84]

Brought my oxford oil filled home the other day, it's usually down at the workshop where it runs off a genny. Never used it on the mains before.

On the genny, welder set to 80 amps, it'll run a 2.5mm rod ok but could do with being on the next setting up (100a) but that trips out the genny breaker. Genny is 4.5kva, has an AVR but is one of the floating earth types.

Same rods, same welding cables running on the mains, 80a is very hot, 100a blows holes unless I'm going fast and 60amps is spot on. It's a totally different machine than it is on the genny.

What gives? Is it running the genny close to max that is maybe dropping the voltage or something like that?

 

[brightspark]

the genny will run it but down on power due to the load so the output amperage will be lower

 

[frank horton]

same comparison with single n 3 phase.......my Oxford works soooo much better on 3 phase.....

 

[brightspark]

same comparison with single n 3 phase.......my Oxford works soooo much better on 3 phase.....

how does that work out then theres a stepdown transformer in side .the output voltage is the same on single or 3 phase .its like saying 240v power tools are better than 110 v. motors are a different thing better starting torque and smoother running on 3 phase

 

[Brad93]

You probably need an 8kva genny to run an Oxford. If not more. My old Fronius transpocket needed 4.5kva but would not run right on a 5.somethingkva generator