I have a contemplated DC electricity system that has a battery room at a distance from the use. The battery room would be about 150 feet away from where the power is used (for lighting, computer systems, etc). The total wattage of the system will be around 5000 watts or on that order.
I am concerned about the power loss over the 150 foot distance. There would seem to be two basic approaches: using a very thick braided transfer cable, or to step up the voltage from 48 volts to 220V or something like that, transfer it, then step it down again when it gets to the point of use.
What should be my considerations in designing this part of the system?