This unit is connected to a POWERTECH MP-3750 via the usb (for a power supply to the UNO board)
The voltage divider is connected to the POWERTECH 'load side' positive and negative so I can read the voltage
The ACS is in series with the 'battery connection' positive of the POWERTECH to read the amps.
When I disconnect the usb the OLED display and board is still 'ON' The OLED display then dims to about half illuminance.
My question is where is it draining power from?