[bob1029]

> On top of that, you have to use DC-DC power electronics, which are much more expensive than transformers etc. at high power levels.

Is this actually true though? I just bought a reel of 30 high power mosfets from digikey for ~$450. Each of these bad boys can rock ~1kW continuous switched output/input. Magnetics for the HV boost section of a 30KW DC-DC converter circuit are a mild additional cost.

Compare this to how much money you would have to spend for a more traditional copper & iron monstrosity of similar rating (well over $1000).

Weight is also a huge factor when you start talking about megawatts.