@Chumly,
Quote: the source voltage and the load voltage does not in and of itself dictate the power loss due to voltage regulation.
You kidding me correct as power equal voltage time current and the power being wasted in the case I referred to is 400-35 volts time Current compare to the useful power of 35 volts time current.
So to sum up that design is wasting 365/400 or 91 percents of the total power being used.
Now if instead if a DC to DC step down design had been used then yes indeed the situation would had been far better as far as power being thrown away is concern and the voltage in compared to the voltage out would not have such a linear relationship to the power being wasted.