Eco mod my welder

oil pan 4 · 06-26-14, 01:38 PM

Hey .98 is good for any motor. I cant get most of mine much above .90pf.

I power factor corrected my small 110v powered 100amp out put craftsman arc welder.
At no load it goes from .30pf to .75pf with the addition of a 50uf capacitor. Under load I expect the pf to go up to some where around .90pf.
I used 40, 50, 55, 60 and 80uf capacitors to test it out.
The capacitor is just sitting on top of the machine, I have not installed it. Hopefully I can make it fit in there with all the DC output stuff and ducted fan I added. I rather not attach it to the out side since I want to keep this machine portable and self contained.

On my full sized 240v powered arc welder I tested out those very large mallory power factor correction capacitors I salvaged. They worked better than the two 80uf motor run capacitors.
I will sling the mallory capacitors up under my large machine. Since for some reason two 60uf capacitors wired L to N gives the same performance as a single 40uf capacitor wired L to L.
I have been getting very good performance out of two 55uf capacitors wired L to N.

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06-26-14, 01:38 PM	#13
oil pan 4 Land owner Join Date: Nov 2012 Location: NM Posts: 1,026 Thanks: 12 Thanked 127 Times in 107 Posts	Hey .98 is good for any motor. I cant get most of mine much above .90pf. I power factor corrected my small 110v powered 100amp out put craftsman arc welder. At no load it goes from .30pf to .75pf with the addition of a 50uf capacitor. Under load I expect the pf to go up to some where around .90pf. I used 40, 50, 55, 60 and 80uf capacitors to test it out. The capacitor is just sitting on top of the machine, I have not installed it. Hopefully I can make it fit in there with all the DC output stuff and ducted fan I added. I rather not attach it to the out side since I want to keep this machine portable and self contained. On my full sized 240v powered arc welder I tested out those very large mallory power factor correction capacitors I salvaged. They worked better than the two 80uf motor run capacitors. I will sling the mallory capacitors up under my large machine. Since for some reason two 60uf capacitors wired L to N gives the same performance as a single 40uf capacitor wired L to L. I have been getting very good performance out of two 55uf capacitors wired L to N.