I could be wrong, but I don't think you'll find EM pumps in use for any liquid metals at temperatures above about 1000C. The 2400C temperatures required for t

I could be wrong, but I don't think you'll find EM pumps in use for any liquid metals at temperatures above about 1000C. The 2400C temperatures required for this thermal battery concept present a significant materials engineering challenge for anything that touches the heat storage medium. There just aren't many mechanically sound, or electromagnetically capable solid phase engineering materials to work with at that temperature. I'm not saying what they describe can't be done, only that getting the photovoltaic part to work isn't the biggest engineering challenge the concept faces.