I created a test rig for AEMSUCA because this Monday evening I expect to receive the batch of 50 from Elecrow, China.
The way it works. The AEMSUCA is pushed between the diagonal 0.1" header pins to make electrical contact. Then 1.5V from the AA alkaline battery is applied to the solar input pins and the LEDs connected to the 3.3V and 1.8V outputs turn on when the circuit fully works. This tests all functionality of theboard except for the status output.