Just an observation, but from the reading I did when I first started doing eletrolytic rust removal, higher voltages may not be a good thing. As voltage increases, the reaction gets more aggressive and with it comes more pitting of the metal surface.
Electrolysis doesn't need high voltages to work and compared to what most experimenters were doing with wall wart and 12v battery charger supplies, the 18-20V laptop PSU I use is at the high end of common DIY practice.
Now different panels have different specs, but my solar panels make 70VDC on a good day and that's enough to physically affect you. You can do the job with less.
