the 20c ones are the cheapest 5.2Ah cells i could find at the moment. and i like to have a "little" power kick possiblity as a reserve for emergency
im going to splitt the battery packs from dual cell into single cells for a higher current of 20.8Ah in total.(yes i bought 2 battery packs ^^)
then im going to power the raspi with 3.3V since i dont need the hdmi or usb ports.
the solar cells will provide around 9.6Ah at 5V.
each lipo cell will be charged at a max. of 1A, which makes ~4.5-4.8A in total, including the power loss of the charger chips (i calculated quite generous).
the raspi will drain ~0.3A on 3.3V.
makes ~5A in total.
leaves a bit more than 4Ah for the rest of the system and even more when the lipos are fully charged. well in fact, even during the charging cycle will the system have a higher priority than the lipo´s which makes it possible to use the full solar power plus the power which could be in the lipos. its a very crazy circuit..
as for you´re question about the discharge rate, the charger circuit will have a discharge rate of ~1mA.
the power converter ~3mA.
a additional power management ic with it´s child ic´s and components will drain another ~45mA.
dont know about the lipos yet since i have to wait until they arrive and i can test them (estimated delivery is end of next week).
makes ~50mA when the raspi and the rest of the system(motors,sensors...) is off.
im still calculating and investigating the power consumption for all other system parts. like the sensors and stuff..
im currently at ~300mA which covers all sensors exept gps.
the servos and motors are still in an investigation state. but they will not be used all the time anyway.
i hope this gives enough information for now.. when i have more infos, i will put them in the project detail posts.
but i still have quite some calculations to do...