From https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20160012354.pdf https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/201600... 2-5 W / kg. Solar c

From https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20160012354.pdf https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/201600... 2-5 W / kg. Solar cells seem to be about 150 W/kg. This is relevant for outer system exploration (beyond Jupiter) or maybe for night power on planetary / moon surfaces.