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Sunkko 709AD Spot Welder Fail (110v Version)
#21
Just a heads up, I have the 220v version and while its got plenty of power for the job, mine gets warm after about 100 welds and it then trips my 16A RCD about once in every few welds. It works great again when it cools down over night say, but once it warms up again, the problem repeats. Completelycharged recommended I try it with a long extension lead to act as a buffer. I'll give it a go when I next have a few hundred welds to do.
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#22
Another thing you could do is add some fins to the transformer and put a big fan in there (or a larger one if there already is one there). The more air flow you have, the easier the transformer can work w/o overheating.
As far as the fins, you could just put a few aluminum heat sinks glued to it if there's space for it. But the fan alone might be good enough if it directly blows on the transformer
Proceed with caution. Knowledge is Power! Literally! Cool 
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#23
Check out this youtube video. It says the power to the external pen is much weaker than the  fixed electrodes.  The youtuber beefed up the current by soldering extra 10g copper wire.

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#24
I recently bought a Sunkko 709AD (220 V) but got the 110V version by mistake, so i figured i would just plug the equipment with a step-down transformer, but before trying that i wrote to Sunkko and this was their response: "Actually, the circuit system will be unstable when the welder works with a transformer, we don't recommend to use sunkko welder with a transformer." Does anybody has some clue to what they mean by "unstable"? Also, what other solutions could you suggest besides sending the equipment back? Thanks!
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#25
I would return the 110v version and buy the 220v version. Message the seller ahead of time to make sure they can ship you 220. Several of the ones I contacted told me they only ship 110v to the US even if the listing said 220v. Using a 220v > 110v transformer just sounds like a bad idea and won't help if the transformer in the 110v unit is part of the problem to begin with.
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