I am looking for a voltage sensor that I can use to trip a low voltage alarm for a 12S9P Li-Ion battery configuration. The battery operating voltage is between 45.3V max -- 30V min. Manufacture recomended low voltage for this configuration is 30 volts, I would like to trigger a low voltage alarm approx 31.5 Volts decending. I also have a 4S9P Li-Ion battery configuration using the same Li-Ion cells that I would also like to have a low voltage alarm for, 15V Max -- 10V min, with alarm at 11.0 volts decending.
I am using 1383 Simple High-Power Motor Controllers to control the main propulsion motors which have low voltage cut-off capability, but I want to know ahead of time so that I can retreive my boat before it goes dead in the water.