I have read that if the value of the capacitors is too big the diodes will blow when the output of a voltage doubler circuit is shorted. It goes without saying that the charge voltage of the capacitor cant be greater than the breakdown voltage of the diode, but the bigger the capacitance the more energy there is to discharge. The maximum current rating of a diode can be looked up, but how can you calculate the maximum value of capacitance without damaging the diode?