I have the older HK 4*50W and the newer Turnigy Quadkore 4*20A. A single 400W makes the collection complete.

Team RCC has a few more 2*200W and 400W Turnigies in the selection.

Power supplies. A few 600W HK units (no longer available) and a 24V/12V 100A monster that never was commercial.

I'm wondering if a cheap Chinese PSu can be seen as a "battery" that can be used in series or parallel... That would give options. Those "iron" LED PSu's are cheap and dependable.