How can I tell if the SunnyBuddy is charging. There is a voltage on chrg but since it has no lights or anything indicating charging how are you supposed to tell if it is charging?
There are no indicators on the board for charging, the best way to tell would be to connect an ammeter in series with the battery. If you see a positive current flow the battery is discharging, if you see a negative current flow, the battery is charging.
If you connect a 10K resistor between CHG and VBAT, CHG should drop low during a charging cycle.