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I see how you calculated draw. Amps times volts of the Pi. 1.5 amps x 5 volts = 6 watts
So 6 watts
As far as the batteries go, 36 amps.
But how did you get 72 hours out of that calculation? Was it (12v * 3amp) * 12 and that divided by the 6 watts from the Pi?
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