Solid state circuit to charge caps in parallel then discharge in series?
I think this is how you could do it in relays: -







simulate this circuit &ndash; Schematic created using CircuitLab

All the switches operate together so if you could use MOSFET SSRs I guess you'd be just about there. 2 Single SSRs can be made to form a c/o contact and you'll therefore need four per capacitor. Or just use relays.

R1 is the discharge load (whatever it may be) and you can step and repeat for as many capacitors as you wish but watch the relay contact open-circuit voltage ratings. A simpler version is this (I believe): -



And if you were prepared to suffer a couple of diode drops it could look like this: -







simulate this circuit

(Well I think I'm sure!!)