Output capacitors

[Owen333]

I'm designing a DC-DC Boost MPPT to charge a battery, ~60-90V input, 135-155V output, and 1-6A input from the solar array, I understand why you use electrolytic capacitors for bulk capacitance for load transients because of the lower ESR at DC, and why you use ceramic capacitors to eliminate more of the voltage ripple because of the lower ESR at higher frequency's. But since the output is at a higher voltage I don't think I'll be able to find any ceramic capacitors at that high of voltage and the DC bias would be terrible anyway, I could find some at way lower values but not enough for a 30% current ripple. My thought is to parallel 5 polymer capacitors around 100uF each to get a lower ESR and have enough capacitance for load transients. Is there anything else to consider, My capacitance value chosen is based on other MPPTs based around those switching frequency's and power ratings because I am also having trouble finding a good value for my output capacitance. Is there any suggestions about my situation? I will put some more specs about this board below

200 kHz switching frequency
470uH inductor
30% inductor ripple

 

[cupoftea]

For output capacitance.....just use the bare minimum...the batt will be the main output capacitor.
Use the capacitance so as to reduce the area enclosed by the switching loop of the boost...eg some low value ceramics.