I've got a microcontroller project that I would like to power off a battery (lead acid) and keep the battery changed via a solar cell.
A few questions.
1) The circuit draws 100mA at 5V - I'm looking to get a 1.3Ah 6V battery. First off, how long will this battery keep my project running if its not being charged. Its 1300mA per hour? So it will be 13 hours? Is that then 13 hours until the battery is dead? How will I be able to work out when the 6V will drop below say 5V at which time my microcontroller won't have enough juice to work.
Or do I just buy the battery - connect up my circuit and start a stop watch
2) I assume to charge the battery via solar cell I will need around 3 x 2V 100mA solar cells? Or maybe 4.
One cell at 2V 100mA won't work will it?
A few questions.
1) The circuit draws 100mA at 5V - I'm looking to get a 1.3Ah 6V battery. First off, how long will this battery keep my project running if its not being charged. Its 1300mA per hour? So it will be 13 hours? Is that then 13 hours until the battery is dead? How will I be able to work out when the 6V will drop below say 5V at which time my microcontroller won't have enough juice to work.
Or do I just buy the battery - connect up my circuit and start a stop watch
2) I assume to charge the battery via solar cell I will need around 3 x 2V 100mA solar cells? Or maybe 4.
One cell at 2V 100mA won't work will it?
Last edited: