As you can see in the thread I had to replace my Mosfet drivers and Mosfets and had no problem since. The first time I accidentally bridged some connections on the bottom next to the soldered wire with a bad soldering job.
Maybe you did the same?
Ah ok I seeā¦
I look after them later today and try a new battery, if everything looks good.
Thx 
So from looking at the picture you posted it looks like you got some nice welds. What made the difference?
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Yep! Was the battery! Just went and bought a 95 Ah 710A big battery and everything works perfectly fine!
Iām welding with 11 mS now 
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what kind of wire are you using? i got some fat wire but it is very stiff and i cant pull it through the transformer
8awg. Works good, but gets warm after a few welds. So Iād take 2 8awg parallel.
just leave this here for other people to find: Arduino Spotwelder from KƤptĀ“n Balu:
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Or thisā¦ (my welder)
@acido Maybe build your own? There are plenty of diy options out there. Some good info in this thread too.