Yes, it is all solar power. 5.5 kW is not a lot of power, modern buses for geostationary satellites (i.e., 720HP) can produce close to ~18 kW, of which ~80-90

Yes, it is all solar power. 5.5 kW is not a lot of power, modern buses for geostationary satellites (i.e., 720HP) can produce close to ~18 kW, of which ~80-90 % are normally used by the payload in a communications satellite.