So I have a transformer that claims to be rated for up to 208v input and at that voltage will output 12v-0v-12v or 24v. Thinking I knew what I was doing I hooked it up directly to 110v household mains, thinking I can use this lowered voltage to get more amps out the back. When I put power to the transformer it showed 8.5v out or 17v together and after rectification I have a nice 23.7vdc. I can seems to get the math right and I guess I am struggling with it. The biggest load I have tried for far measured at 6.6amps dc and the transformer didnt even warm up. My math for far is: 3.75va is rated for 208v and 110v is roughly half that so double to get roughly 7.5va. Then my output ac voltage is 17v so 7.5/17=441mA roughly. This seems really incorrect and I keep reading through the transformer design chapter of Vol II AC on this site and still dont get how to use VA properly.
My question is how big of a load can I put on this transformer before blowing it up if the transformer is rated at 3.75va.
My question is how big of a load can I put on this transformer before blowing it up if the transformer is rated at 3.75va.