[AdrianH]

I can see the cheapness in not having dedicated mains supplies, as it says it can take solar, battery a.c. Then to me it is like a slow switched power supply, everything goes to a DC level and is chopped to a lower voltage to make it safe say 50 Volts and distributed to max 24 circuits per server each with monitoring built in. That way they can use normal safe low voltage circuits to pass the supply to the receiver which I would assume reforms it to what is required either a.c. or leaves it as DC but at what ever voltage is required. It says that each server can provide 3kWatts, so I can see in a building potentially several 3kW 600Hz transmitters having long antennas made up of potentially unshielded cable which could mean several hundred meters or wire. OK it is low frequency but lots of potential for unwanted harmonics taking out the VLF spectrum so hope decent filtering is used.

Also I would wonder about efficiency low volts more amps per circuit more resistive loss?

Adrian

Many points picked up by Chris there, my slow typing again.