- Sun Jul 16, 2017 9:24 am
#195589
I have a breadboard setup with a Pro Mini collecting data from BME280 T/RH/press DHT22 T/RH sensors. A real time clock board and micro SD card board are used for recording data. My code collects data about every 2 minutes with Narcoleptic delays inserted between data collection and recording events. This circuit draws about 25 mA during data collection/recording and about 10 mA when the Narcoleptic delay is in effect (most of the time).
Powering this setup with a 6-V 3.5-W sparkfun solar panel, a Sunny Buddy, a 4400 mAh LiPo battery, and a buck-up converter to provide 5V to power the Pro Mini seems like it should work continuously. However, I find that the battery does not stay charged and after a few days (even now, during the height of the summer), the system shuts down. Yes, I have followed the instructions about setting the knee voltage to around 3V.)
Why won't this setup keep the battery charged?? Do I need a larger battery? A larger solar panel? (With a larger panel, or two panels in parallel, perhaps I could increase the charging current?)
Any suggestions will be greatly appreciated!
Powering this setup with a 6-V 3.5-W sparkfun solar panel, a Sunny Buddy, a 4400 mAh LiPo battery, and a buck-up converter to provide 5V to power the Pro Mini seems like it should work continuously. However, I find that the battery does not stay charged and after a few days (even now, during the height of the summer), the system shuts down. Yes, I have followed the instructions about setting the knee voltage to around 3V.)
Why won't this setup keep the battery charged?? Do I need a larger battery? A larger solar panel? (With a larger panel, or two panels in parallel, perhaps I could increase the charging current?)
Any suggestions will be greatly appreciated!