I've got a circuit composed of an Arduino Mega that is interfaced with an Xbee Pro Series 1 receiver, Parallax GPS, and a uOLED display screen. I'm trying to figure out an external battery combination that would power this circuit for up to 80 active hours. I've got this theory that I need someone to double-check for me.
The uOLED display screen operates at 5V with 80mA typical current. The parallax GPS operates at 5V with 115mA typical current. The Xbee receiver operates at 3.3 V with 50mA typical current. The Arduino Mega will operate at 5V with about 100 mA typical current. So all our devices except for the Xbee receiver will operate at 5V, and the full circuit will draw a total typical current of about of 345mA. Supposing that the Xbee receiver has a very low power voltage regulator that consumes negligible current, I was thinking about powering this circuit at 5Vdc supply using the following combination:
I plan on using exactly twelve 1.25V, 9000mAH batteries. I will have 3 sets of 4 of these batteries in series. These 3 sets will then be put in parallel combination. Therefore, I will end up having a battery of 5V (1.25 x 4) at 27000mAH (9000 x 3).
Since the total typical current of my circuit is about 345 mA, can I assume that this battery will power my circuit for up to 78 hours (27000 mAH / 345 mA) ??? If you have a battery alternative that could help power this circuit for about 80 hours, please let me know.
Your input on this is greatly appreciated. Thanks in advance...