How can I make a 3.3v Solar power supply that uses an 18650 battery? Answered
I have a project which I would like to make self sustaining solar powered that runs 24hrs a day. the electronics themselves use between 60ma and 220ma of power. the 220ma is for about 1 second every 2 minutes when the device transmits it's sensor's data, the rest of the time it is 60ma to 80ma. I want to make sure that the circuit has overcharge and over discharge protection for the battery as well as voltage regulation to between 3v and 3.3v for the load. I have been searching and I cannot seem to find a premade solar controller board that will do what I need. If there is one <$20 USD please point me in that direction, but I would still like to learn how to build one.