Originally Posted by
rhodopsine
I once had a discussion with a Novak engineer and whet he told me is that the Cap had to be of low ESR type ( equivalent serial resistance, I think).
Lower ESR gives higher ripple current capability. While it's not absolutely necessary, using low-ESR capacitors helps keep the physical size smaller while giving the ESR required by the ESC.
Other ways to decrease the total ESR and give higher ripple current capability are using capacitors with higher voltage rating or higher capacitance.
Also, using several smaller capacitors with the same total capacitance as one single capacitor will increase the ripple current rating, since they have more surface area to dissipate heat, and the heat has a shorter path to get from inside to the outside.
Again, if replacing an ESC power cap with another made for the purpose, all of the above is already taken into account. But I have included the info as a response to the title of this thread.