Aus den q&a von rcgroups:
Q: How does the low voltage alarm work? I can not see any connections for input V?
A: The Battery voltage input is the unpopulated hole to the left of the yellow component. Connect a cable from battery+ to this hole. The ground return is through Output #1's ground wire. Go to "Misc. Settings", "Alarm 1/10 volts:" to set the threshold. It is in 1/10 volts, so 10.5V is entered as "105". The LVC is only active when battery voltage is below the limit. When it goes above, it stops. Also it beeps faster the lower the voltage is below the limit.
Q: How does the low voltage alarm work? I can not see any connections for input V?
A: The Battery voltage input is the unpopulated hole to the left of the yellow component. Connect a cable from battery+ to this hole. The ground return is through Output #1's ground wire. Go to "Misc. Settings", "Alarm 1/10 volts:" to set the threshold. It is in 1/10 volts, so 10.5V is entered as "105". The LVC is only active when battery voltage is below the limit. When it goes above, it stops. Also it beeps faster the lower the voltage is below the limit.