Due to the nature
of the final
project to be autonomously navigating Mars, all power supplies have to
be portable, and rechargable.
As a result all
experiments and prototypes have been designed and implemented using
rechargable battery system.
Numerous commercial power supplies have been tested:
Buck/Boost converter boosts single LiPo 3.7v or single LiFePo 3.2 v to 5.2volts to power Raspberry Pi model 3B.
Works well for
this purpose but single cell will not run the unit for more than a couple of hours.
charger for single LiPo 3.7v. This charges one in about 3.5 hours.
It will also charge 2 LiPo (3.7v 2.6Ah) cells
connected in parallel in
about the same amount of time.
converter sets the Weather Station internal voltage to 5.2 volts for
the Raspberry Pi model 3B. The first prototype used a battery box
2 LiPo cells (18650) in series to give an output of 7.4v. This is then
reduced to 5.2 volts. Fited into the battery box is a charging
pcb that will charge this
arrangement (7.4v) from a standard USB port. This runs the weather
station for 6 hours continuous. This unit is also used
to regulate the solar panel output to 12volts or 5.2