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I posted this voltage converter, and did not dive deep enough into it at first. If you go to Amazon and search 120VAC to 240VAC Voltage converters, you will find a real variety. Price for 5000W for $96 to $189. They all seem to be the same basic unit. (You can determine by the weight the amount of copper wire in them. ) That is all these are is a step-up or Step down transformers. They rate them at 5000w or 120V about 40A, but only come with a 120V15A plug and cord. They say to buy 50% higher than needed, for startup surge. which makes sense, especially with our chargers, which act the same as a modern mosfet welder (They mention these in some of their information). These devices have a large bank of capacitors that take a huge surge to fill instantaneously at plug in, and then run at there rating. You have all seen the sparks when you plug these guys in. But still if you are running a Stark charger at 240V 14-15A, that is about 3300W running, with a 120VAC input to the converter, that is 30A. The power input cord is not made for that current, nor is the plug, they melt. I have a 3500W 120V generator, and it has an RV 120V 30A plug, and they get hot on my RV. So if you look at all the specs, they put fuses on the converters, and fuses will be blowing with these loads, or more importantly these surges. Maybe a slow blow fuse might last, but a circuit breaker might be the best, and some do have that. You can get variable time constant Slow blow breakers, but none of these come with that.
If I were to try one, it would be this model, because they state a current rating, and it has a circuit breaker on it. ( If the breaker pops the first time, it should work the second or third time, once the caps are charged) The input cord and plug should be changed to #10 3 wire, and a RV 30A plug, and on the output I would use the European 220V plug to the charger.
I haven't tried one of these, but if you have, give me your feedback