Why not construct clusters of low voltage batteries each with their own set of solar cells. ... The solar cells could then be placed on all sides of the spacecraft and charge their associated batteries at will...
Yes, this was our design back in the mid 90's for a tiny softball sized satellite. A single NiCd per side with a magnet for tumble and radiative B/W paint for spin to assure even illumination. Each cell was charged by itself, and the series string was used to power the spacecraft (6 times 1.2v) to give a nice 7.2/8.4v bus.
It solves the number one problem of spaceccraft batteries, that is, charging and discharging in series. Also, no inefficiences of boost inverters.. Penalty was that cells had to have larger capacities because each one would see less charge time.
Bob, WB4APR