Quote Originally Posted by Tom J View Post
1000uF for 1A, voltage is important (20% more than operating voltage and you are safe, min 100V caps for 80V system.)

Small capacitor won't take enough power from stepper when slow down or change direction (EMF). I am scared to write anything now
The thing is, that 1000uF per A is an arbitrary figure provided as a guideline.
I just had a quick scan through the Gecko Drive guide, and they list the following formula for minimum capacitance in uF-
(80'000 * I)/V

I'd imagine they've done some calculations and research to reach that figure, and it'll involve the maximum voltage ripple their drive internal capacitors can handle safely under various conditions.