Don't buy the junk off E-Bay.
Just drop the $350 on a Sota built one.
Ya it sucks, its expensive, but it beats wasting your time on junk that won't work.
The Sota one won't break and has actually been tested.
I've visited Sota, and saw the little electronics lab they test there stuff in.
I've seen the crap they sell on Ebay.
It looks really sketchy, and if they use the wrong diodes, if they even do, the capacitor will eventually blow up and scare the hell out of you, or burn you.