I have a device that operates on average 0.6 watts. I want to design a battery that will leave this device on for 17 hours straight. I know that charge(Q) = current * time. My device has an operating voltage of 5 volts. So my calculations are:
(0.6 watts / 5 volts) * 17 hrs = 2000 mAh
I also want to charge the battery using a solar panel for 7 hrs of sunlight. So i wanted to compute the required wattage from the solar panel to charge this battery to max capacity in 7 hrs:
(2000 mah / 7 h) * 3.7 v = 1.05 watts
(3.7 volts battery)
Can someone please verify that my math is correct?