Hey, rojitor, if I'm not mistaken... 3s vs 4s is actually not necessarily as important as mAh and C.... ie. a 4,000 mAh 120C 3s is a huge difference from a 1,200 mAh 30C 3s or even a 1,200 mAh 30C 4s..... if I'm not mistaken
On a separate note, I finally got around to disassembling my broken welder, and testing the MOSFETs... looks like all 6 are blown. The drain to source is constantly connected.
I'm debating on what FETs to get to replace these (also hoping that replacing them is all I need to do to fix this thing). If I'm not mistaken, these are the ones currently on the device, and bad price (well, except this is the legit manufacturer... not to say the ones on it are any bad) https://www.arrow.com/en/products/irf1404pbf/infineon-technologies-ag
But instead, I'm thinking about getting these: https://www.arrow.com/en/products/irfb7430pbf/infineon-technologies-ag
A little pricier, but seems like close to double the specs. Can also order Chinese versions dirt cheap on ebay... but I think I'll stick with arrow... free overnight shipping.
On a separate note, I finally got around to disassembling my broken welder, and testing the MOSFETs... looks like all 6 are blown. The drain to source is constantly connected.
I'm debating on what FETs to get to replace these (also hoping that replacing them is all I need to do to fix this thing). If I'm not mistaken, these are the ones currently on the device, and bad price (well, except this is the legit manufacturer... not to say the ones on it are any bad) https://www.arrow.com/en/products/irf1404pbf/infineon-technologies-ag
But instead, I'm thinking about getting these: https://www.arrow.com/en/products/irfb7430pbf/infineon-technologies-ag
A little pricier, but seems like close to double the specs. Can also order Chinese versions dirt cheap on ebay... but I think I'll stick with arrow... free overnight shipping.