I keep reading that the built in LiPo charging board charges at a fixed 350mAh rate for 4 hours and then enters an "automatic sleep mode". What does this exactly mean? How/when does the charger exit "automatic sleep mode"? Does it require the power to be unplugged and replugged to initiate a new charge cycle? My use case has a solar panel which in theory should stop providing voltage at night, will the charger only charge for 4 hours each day and only restart the next morning?