I've a step down adapter for US appliance but only up to 50w, enuf?

Do you not get any information when you buy your thing from whoever?

And please use the proper thread next time.

Wii and GCN thread v2.

Wii requires 12VDC, 3.8A . by formula P=VI=(12)(3.8)=45.6 W.
Hence by calculation it consumes 45.6 W. By using 50W is not advisable. for safety reason , a head margin of 20-50% power is required. 45.6+20%=55 W +/-1 W. find one above 60W if possible.

by using 50W, operating in this condition yr transformer/adaptor may built up heat very quickly. if you want to do a little experiment get a 50W & 200W adaptor and power up for 3 hours and feels the heat .