I am designing a simple meter, it reads a sensor and outputs the reading to an LCD, and I want it to run on a single coin cell rechargeable lithium battery. The system only takes maybe an average of 500 uW when its awake and a few tens of uW while asleep. It needs to be able to stay charged while asleep and recharge somewhat for when it is in the active state (probably less than 1 hour per day). It will be located inside, so needs to charge off of flourescent lights.
It looks like all of the solar solutions are either for large solar panels or energy harvesting, meaning either higher power than I need, or lower power than I need. Is there a solution in between that someone can recommend? It needs to be able to charge the battery from the solar cell when it is low and have a disable so I can turn off the charging when I'm taking a sensor measurement, for noise purposes. Ideally it would also be able to control the charging and turn off automatically.
I can find lots of information about solar charging and energy harvesting at the website, but I need something pretty specific.
Thanks.
