I think the idea is use these only for low wattage applications, way below 2400 Watts. 48V at, say, 10A is plenty of power for many uses. Also the transmission distances should be relatively short if coming from a battery in the home.
The cross over is surprisingly early. I care for a cabin that uses a 24VDC battery for its solar power storage. I run that in #6 copper to the cabin (pencil thick conductors). I regularly see a >2 volt drop on that run when the tiny high efficiency fridge kicks on, on top of the ~40watts that the telemetry and comm gear takes. You wouldn't notice that on a 120v line, but that's 10% of my power gone to heating the earth.
Given a do-over on infrastructure, with today's equipment costs, it would save up front capital and power to use a small inverter at the batteries and run those items off of AC using smaller copper lines for the long run. Keep in mind that you still need DC-DC converters at the loads, since nothing is going to want to run off of your varying DC socket voltage.
(Batteries closer to the cabin is not a win, the solar panels are off that direction and those lines need to be kept short too. I do have a large inverter in the battery shed and send 120v to the cabin for big loads, but its idle current is too high to keep up for the base loads. The most expensive part of this spring's wind turbine installation (and heaviest) is the copper wire. Low voltage DC is not an answer.)
