What is the switch used for? I don't see it listed in the schematic. Can the board function as a UPS, and automatically charge when solar power available, and switch over to battery/usb otherwise? Or do you have to manually switch from one to the other?
Hi. You can switch the working mode of Energy Shield between “OFF” and “ON” via the working mode select switch. In “OFF” condition, Lipo battery doesn’t output but only pull current from any existing power source. In “ON” condition, the battery gets charged as well as supplies power to the whole system.