Here are a couple of toroidal transformers to consider:
http://www.mouser.com/ProductDetail...=sGAEpiMZZMvwUzoUXIIvyW8HfC4QLhUedHFykF/Sx2E=
http://www.mouser.com/ProductDetail...GAEpiMZZMvwUzoUXIIvyTw34uqMHR%2bupAXftcIwciE=
Basically, 120v or 240v to 48v center tapped, ~21A out, 1KVA for both of them. Both around $167. Not cheap, but these will be quite efficient.
The days of large, cheap transformers are gone. If you think these transformers are expensive, just wait a few months - they'll be yet more expensive.
http://www.mouser.com/ProductDetail...=sGAEpiMZZMvwUzoUXIIvyW8HfC4QLhUedHFykF/Sx2E=
http://www.mouser.com/ProductDetail...GAEpiMZZMvwUzoUXIIvyTw34uqMHR%2bupAXftcIwciE=
Basically, 120v or 240v to 48v center tapped, ~21A out, 1KVA for both of them. Both around $167. Not cheap, but these will be quite efficient.
The days of large, cheap transformers are gone. If you think these transformers are expensive, just wait a few months - they'll be yet more expensive.