This is the prototype of the power train for the project. I used this to measure its characteristics.
In full sun I measured 90mA of charge current into my LiFePo4 battery when perpedicular to the Sun and 60mA. 30mA on a cloudy day and 23mA when tilted at 45-degrees to the apparent Sun direction. 500uA in shade, not pointing at the sky. 20mA of charge current was measured through a window in my house pointing at a blue sky (the Sun not in view).
The back-leakage from the battery storage cell to the circuit with no sun was ~1uA, ~6uA at dusk and dawn conditions.