adafruit_support wrote:No. That cap is on the input side of the charge controller. Not the output.
Yes, but could the load sharing feature cause this to happen:
1) Upon initial power-up, the solar panel input (Vcc) provides no power at all (due to light conditions), so the charge controller gets its input from the LiPo (Vbat) only, and load is powered by Vbat only.
2) After some time the solar panel provides enough power to power the load without having to use the LiPo, so charge controller switches to using Vcc only
(i.e. the load sharing thing kicks in). At the same time, the capacitor is charged to full capacity (say very large, 10F or something).
3) It turns dark again and solar panel suddenly provides no power at all, but capacitor is still charged and still provides input to the charge controller, so charge controller continues to draw power from Vcc only.
4) When the capacitor is fully discharged, charge controller switches to drawing power from Vbat only.