Transformer idea

I'm doing this to charge my capacitors and it works perfectly.

A though is, put them in series. You put one backwards so you still get 220. ?

You could still use a fuse sized for circuit load.

I think it's a good solution, remember do not use any ground if you want really to be isolated.

I just tried it, and it seems the transformers aren't powerful enough to maintain the output constant and high enough. Without load the output is 180Vrms which will come nicely to 250VDC after rectification, but once i load it up the voltage quickly kneels down to 60Vrms and after rectification it even falls down further. This is so frustrating 😤. I even tried driving the second transformer with a more powerful one, and it seems to be working, keeping the voltage at a steady 160V, but the second transformer gets hot, which brings me to think that this is not very stable. I don't know what to do. Should i keep the first option with the 60V output and use a voltage tripler, or should i start looking in a different direction?

Less windings?

Nope that's not the problem. I just think the primary transformer is not strong enough to drive the secondary correctly. Idk I'll try a few ideas.

Mine is working perfectly with an output of 350v!

It must be more powerful. Mine is 8V 8VA. I'll probably need something a little more powerful.

Niki, your has just a little bit of current flowing, that's because it works. The one that thebugger has made has to deliver a lot more current and so the voltage collapse. I suppose.

Yes that is correct. Once you load the secondary above its rating, the induction is insufficient to maintain the voltage at the desired current, so for the rating to remain the same the voltage kneels to a certain point. Now, that usually has no great impact, especially after rectification, but when you're trying to step it up again, every last decimal point is important. Less voltage will cause less induction.