[RE-wrenches] Large transformer losses

[Jay]

Hi all. 

Anyone know what the tare loss and efficiency is of a 75 kw transformer?
And it would be run mostly at 1-10kw max. 

This one specifically. 
hammond SG3L0075PE

I’m just curious about it. The situation is 240vac grid at the street, 600’ to the house 400 amps. 


Why 400 amps on a house with propane heat, cooking, water heater, dryer and no AC. 
I don’t know. 

Thanks
Jay