480v to 208v Calculations with Xfrmr

[MJRobinson]

Newby here,

I want to confirm my understanding for this?

480V load (solar) 208 Utility

I have a (480V * 316A * 1.732) = 262.7k kVa / (208 v x 1.732) = 729A 208V

For transformer sizing?

208V * 729A * 1.732 / 1000 = 262.70 kVA transformer

Thanks

 

[augie47]

Ohms law. Ignoring losses in transforming, power (kw) doesn't change.
Your number are right for a 3 phase arrangement.
(I think your 'standard' transformer will be a 300 kva.